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-rw-r--r--arch/riscv/kvm/Makefile1
-rw-r--r--arch/riscv/kvm/mmu.c35
-rw-r--r--arch/riscv/kvm/vcpu.c203
-rw-r--r--arch/riscv/kvm/vcpu_exit.c496
-rw-r--r--arch/riscv/kvm/vcpu_fp.c27
-rw-r--r--arch/riscv/kvm/vcpu_insn.c752
-rw-r--r--arch/riscv/kvm/vcpu_timer.c4
-rw-r--r--arch/riscv/kvm/vm.c4
8 files changed, 936 insertions, 586 deletions
diff --git a/arch/riscv/kvm/Makefile b/arch/riscv/kvm/Makefile
index e5c56182f48f..019df9208bdd 100644
--- a/arch/riscv/kvm/Makefile
+++ b/arch/riscv/kvm/Makefile
@@ -17,6 +17,7 @@ kvm-y += mmu.o
kvm-y += vcpu.o
kvm-y += vcpu_exit.o
kvm-y += vcpu_fp.o
+kvm-y += vcpu_insn.o
kvm-y += vcpu_switch.o
kvm-y += vcpu_sbi.o
kvm-$(CONFIG_RISCV_SBI_V01) += vcpu_sbi_v01.o
diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
index 9826073fbc67..3a35b2d95697 100644
--- a/arch/riscv/kvm/mmu.c
+++ b/arch/riscv/kvm/mmu.c
@@ -343,23 +343,24 @@ static void gstage_wp_memory_region(struct kvm *kvm, int slot)
kvm_flush_remote_tlbs(kvm);
}
-static int gstage_ioremap(struct kvm *kvm, gpa_t gpa, phys_addr_t hpa,
- unsigned long size, bool writable)
+int kvm_riscv_gstage_ioremap(struct kvm *kvm, gpa_t gpa,
+ phys_addr_t hpa, unsigned long size,
+ bool writable, bool in_atomic)
{
pte_t pte;
int ret = 0;
unsigned long pfn;
phys_addr_t addr, end;
- struct kvm_mmu_memory_cache pcache;
-
- memset(&pcache, 0, sizeof(pcache));
- pcache.gfp_zero = __GFP_ZERO;
+ struct kvm_mmu_memory_cache pcache = {
+ .gfp_custom = (in_atomic) ? GFP_ATOMIC | __GFP_ACCOUNT : 0,
+ .gfp_zero = __GFP_ZERO,
+ };
end = (gpa + size + PAGE_SIZE - 1) & PAGE_MASK;
pfn = __phys_to_pfn(hpa);
for (addr = gpa; addr < end; addr += PAGE_SIZE) {
- pte = pfn_pte(pfn, PAGE_KERNEL);
+ pte = pfn_pte(pfn, PAGE_KERNEL_IO);
if (!writable)
pte = pte_wrprotect(pte);
@@ -382,6 +383,13 @@ out:
return ret;
}
+void kvm_riscv_gstage_iounmap(struct kvm *kvm, gpa_t gpa, unsigned long size)
+{
+ spin_lock(&kvm->mmu_lock);
+ gstage_unmap_range(kvm, gpa, size, false);
+ spin_unlock(&kvm->mmu_lock);
+}
+
void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
struct kvm_memory_slot *slot,
gfn_t gfn_offset,
@@ -517,8 +525,9 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
goto out;
}
- ret = gstage_ioremap(kvm, gpa, pa,
- vm_end - vm_start, writable);
+ ret = kvm_riscv_gstage_ioremap(kvm, gpa, pa,
+ vm_end - vm_start,
+ writable, false);
if (ret)
break;
}
@@ -611,7 +620,7 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
{
int ret;
kvm_pfn_t hfn;
- bool writeable;
+ bool writable;
short vma_pageshift;
gfn_t gfn = gpa >> PAGE_SHIFT;
struct vm_area_struct *vma;
@@ -659,7 +668,7 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
mmu_seq = kvm->mmu_notifier_seq;
- hfn = gfn_to_pfn_prot(kvm, gfn, is_write, &writeable);
+ hfn = gfn_to_pfn_prot(kvm, gfn, is_write, &writable);
if (hfn == KVM_PFN_ERR_HWPOISON) {
send_sig_mceerr(BUS_MCEERR_AR, (void __user *)hva,
vma_pageshift, current);
@@ -673,14 +682,14 @@ int kvm_riscv_gstage_map(struct kvm_vcpu *vcpu,
* for write faults.
*/
if (logging && !is_write)
- writeable = false;
+ writable = false;
spin_lock(&kvm->mmu_lock);
if (mmu_notifier_retry(kvm, mmu_seq))
goto out_unlock;
- if (writeable) {
+ if (writable) {
kvm_set_pfn_dirty(hfn);
mark_page_dirty(kvm, gfn);
ret = gstage_map_page(kvm, pcache, gpa, hfn << PAGE_SHIFT,
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index f3455dc013fa..5d271b597613 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -26,6 +26,8 @@ const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
STATS_DESC_COUNTER(VCPU, wfi_exit_stat),
STATS_DESC_COUNTER(VCPU, mmio_exit_user),
STATS_DESC_COUNTER(VCPU, mmio_exit_kernel),
+ STATS_DESC_COUNTER(VCPU, csr_exit_user),
+ STATS_DESC_COUNTER(VCPU, csr_exit_kernel),
STATS_DESC_COUNTER(VCPU, exits)
};
@@ -38,16 +40,58 @@ const struct kvm_stats_header kvm_vcpu_stats_header = {
sizeof(kvm_vcpu_stats_desc),
};
-#define KVM_RISCV_ISA_DISABLE_ALLOWED (riscv_isa_extension_mask(d) | \
- riscv_isa_extension_mask(f))
+#define KVM_RISCV_BASE_ISA_MASK GENMASK(25, 0)
-#define KVM_RISCV_ISA_DISABLE_NOT_ALLOWED (riscv_isa_extension_mask(a) | \
- riscv_isa_extension_mask(c) | \
- riscv_isa_extension_mask(i) | \
- riscv_isa_extension_mask(m))
+/* Mapping between KVM ISA Extension ID & Host ISA extension ID */
+static const unsigned long kvm_isa_ext_arr[] = {
+ RISCV_ISA_EXT_a,
+ RISCV_ISA_EXT_c,
+ RISCV_ISA_EXT_d,
+ RISCV_ISA_EXT_f,
+ RISCV_ISA_EXT_h,
+ RISCV_ISA_EXT_i,
+ RISCV_ISA_EXT_m,
+ RISCV_ISA_EXT_SVPBMT,
+};
+
+static unsigned long kvm_riscv_vcpu_base2isa_ext(unsigned long base_ext)
+{
+ unsigned long i;
+
+ for (i = 0; i < KVM_RISCV_ISA_EXT_MAX; i++) {
+ if (kvm_isa_ext_arr[i] == base_ext)
+ return i;
+ }
+
+ return KVM_RISCV_ISA_EXT_MAX;
+}
+
+static bool kvm_riscv_vcpu_isa_enable_allowed(unsigned long ext)
+{
+ switch (ext) {
+ case KVM_RISCV_ISA_EXT_H:
+ return false;
+ default:
+ break;
+ }
+
+ return true;
+}
+
+static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
+{
+ switch (ext) {
+ case KVM_RISCV_ISA_EXT_A:
+ case KVM_RISCV_ISA_EXT_C:
+ case KVM_RISCV_ISA_EXT_I:
+ case KVM_RISCV_ISA_EXT_M:
+ return false;
+ default:
+ break;
+ }
-#define KVM_RISCV_ISA_ALLOWED (KVM_RISCV_ISA_DISABLE_ALLOWED | \
- KVM_RISCV_ISA_DISABLE_NOT_ALLOWED)
+ return true;
+}
static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu)
{
@@ -99,13 +143,20 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
{
struct kvm_cpu_context *cntx;
struct kvm_vcpu_csr *reset_csr = &vcpu->arch.guest_reset_csr;
+ unsigned long host_isa, i;
/* Mark this VCPU never ran */
vcpu->arch.ran_atleast_once = false;
vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO;
+ bitmap_zero(vcpu->arch.isa, RISCV_ISA_EXT_MAX);
/* Setup ISA features available to VCPU */
- vcpu->arch.isa = riscv_isa_extension_base(NULL) & KVM_RISCV_ISA_ALLOWED;
+ for (i = 0; i < ARRAY_SIZE(kvm_isa_ext_arr); i++) {
+ host_isa = kvm_isa_ext_arr[i];
+ if (__riscv_isa_extension_available(NULL, host_isa) &&
+ kvm_riscv_vcpu_isa_enable_allowed(i))
+ set_bit(host_isa, vcpu->arch.isa);
+ }
/* Setup VCPU hfence queue */
spin_lock_init(&vcpu->arch.hfence_lock);
@@ -199,7 +250,7 @@ static int kvm_riscv_vcpu_get_reg_config(struct kvm_vcpu *vcpu,
switch (reg_num) {
case KVM_REG_RISCV_CONFIG_REG(isa):
- reg_val = vcpu->arch.isa;
+ reg_val = vcpu->arch.isa[0] & KVM_RISCV_BASE_ISA_MASK;
break;
default:
return -EINVAL;
@@ -219,7 +270,7 @@ static int kvm_riscv_vcpu_set_reg_config(struct kvm_vcpu *vcpu,
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_CONFIG);
- unsigned long reg_val;
+ unsigned long i, isa_ext, reg_val;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
@@ -227,13 +278,32 @@ static int kvm_riscv_vcpu_set_reg_config(struct kvm_vcpu *vcpu,
if (copy_from_user(&reg_val, uaddr, KVM_REG_SIZE(reg->id)))
return -EFAULT;
+ /* This ONE REG interface is only defined for single letter extensions */
+ if (fls(reg_val) >= RISCV_ISA_EXT_BASE)
+ return -EINVAL;
+
switch (reg_num) {
case KVM_REG_RISCV_CONFIG_REG(isa):
if (!vcpu->arch.ran_atleast_once) {
- /* Ignore the disable request for these extensions */
- vcpu->arch.isa = reg_val | KVM_RISCV_ISA_DISABLE_NOT_ALLOWED;
- vcpu->arch.isa &= riscv_isa_extension_base(NULL);
- vcpu->arch.isa &= KVM_RISCV_ISA_ALLOWED;
+ /* Ignore the enable/disable request for certain extensions */
+ for (i = 0; i < RISCV_ISA_EXT_BASE; i++) {
+ isa_ext = kvm_riscv_vcpu_base2isa_ext(i);
+ if (isa_ext >= KVM_RISCV_ISA_EXT_MAX) {
+ reg_val &= ~BIT(i);
+ continue;
+ }
+ if (!kvm_riscv_vcpu_isa_enable_allowed(isa_ext))
+ if (reg_val & BIT(i))
+ reg_val &= ~BIT(i);
+ if (!kvm_riscv_vcpu_isa_disable_allowed(isa_ext))
+ if (!(reg_val & BIT(i)))
+ reg_val |= BIT(i);
+ }
+ reg_val &= riscv_isa_extension_base(NULL);
+ /* Do not modify anything beyond single letter extensions */
+ reg_val = (vcpu->arch.isa[0] & ~KVM_RISCV_BASE_ISA_MASK) |
+ (reg_val & KVM_RISCV_BASE_ISA_MASK);
+ vcpu->arch.isa[0] = reg_val;
kvm_riscv_vcpu_fp_reset(vcpu);
} else {
return -EOPNOTSUPP;
@@ -374,17 +444,6 @@ static int kvm_riscv_vcpu_set_reg_csr(struct kvm_vcpu *vcpu,
return 0;
}
-/* Mapping between KVM ISA Extension ID & Host ISA extension ID */
-static unsigned long kvm_isa_ext_arr[] = {
- RISCV_ISA_EXT_a,
- RISCV_ISA_EXT_c,
- RISCV_ISA_EXT_d,
- RISCV_ISA_EXT_f,
- RISCV_ISA_EXT_h,
- RISCV_ISA_EXT_i,
- RISCV_ISA_EXT_m,
-};
-
static int kvm_riscv_vcpu_get_reg_isa_ext(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
@@ -399,11 +458,12 @@ static int kvm_riscv_vcpu_get_reg_isa_ext(struct kvm_vcpu *vcpu,
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
- if (reg_num >= KVM_RISCV_ISA_EXT_MAX || reg_num >= ARRAY_SIZE(kvm_isa_ext_arr))
+ if (reg_num >= KVM_RISCV_ISA_EXT_MAX ||
+ reg_num >= ARRAY_SIZE(kvm_isa_ext_arr))
return -EINVAL;
host_isa_ext = kvm_isa_ext_arr[reg_num];
- if (__riscv_isa_extension_available(&vcpu->arch.isa, host_isa_ext))
+ if (__riscv_isa_extension_available(vcpu->arch.isa, host_isa_ext))
reg_val = 1; /* Mark the given extension as available */
if (copy_to_user(uaddr, &reg_val, KVM_REG_SIZE(reg->id)))
@@ -422,12 +482,12 @@ static int kvm_riscv_vcpu_set_reg_isa_ext(struct kvm_vcpu *vcpu,
KVM_REG_RISCV_ISA_EXT);
unsigned long reg_val;
unsigned long host_isa_ext;
- unsigned long host_isa_ext_mask;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
- if (reg_num >= KVM_RISCV_ISA_EXT_MAX || reg_num >= ARRAY_SIZE(kvm_isa_ext_arr))
+ if (reg_num >= KVM_RISCV_ISA_EXT_MAX ||
+ reg_num >= ARRAY_SIZE(kvm_isa_ext_arr))
return -EINVAL;
if (copy_from_user(&reg_val, uaddr, KVM_REG_SIZE(reg->id)))
@@ -437,30 +497,19 @@ static int kvm_riscv_vcpu_set_reg_isa_ext(struct kvm_vcpu *vcpu,
if (!__riscv_isa_extension_available(NULL, host_isa_ext))
return -EOPNOTSUPP;
- if (host_isa_ext >= RISCV_ISA_EXT_BASE &&
- host_isa_ext < RISCV_ISA_EXT_MAX) {
+ if (!vcpu->arch.ran_atleast_once) {
/*
- * Multi-letter ISA extension. Currently there is no provision
- * to enable/disable the multi-letter ISA extensions for guests.
- * Return success if the request is to enable any ISA extension
- * that is available in the hardware.
- * Return -EOPNOTSUPP otherwise.
+ * All multi-letter extension and a few single letter
+ * extension can be disabled
*/
- if (!reg_val)
- return -EOPNOTSUPP;
+ if (reg_val == 1 &&
+ kvm_riscv_vcpu_isa_enable_allowed(reg_num))
+ set_bit(host_isa_ext, vcpu->arch.isa);
+ else if (!reg_val &&
+ kvm_riscv_vcpu_isa_disable_allowed(reg_num))
+ clear_bit(host_isa_ext, vcpu->arch.isa);
else
- return 0;
- }
-
- /* Single letter base ISA extension */
- if (!vcpu->arch.ran_atleast_once) {
- host_isa_ext_mask = BIT_MASK(host_isa_ext);
- if (!reg_val && (host_isa_ext_mask & KVM_RISCV_ISA_DISABLE_ALLOWED))
- vcpu->arch.isa &= ~host_isa_ext_mask;
- else
- vcpu->arch.isa |= host_isa_ext_mask;
- vcpu->arch.isa &= riscv_isa_extension_base(NULL);
- vcpu->arch.isa &= KVM_RISCV_ISA_ALLOWED;
+ return -EINVAL;
kvm_riscv_vcpu_fp_reset(vcpu);
} else {
return -EOPNOTSUPP;
@@ -729,6 +778,19 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
return -EINVAL;
}
+static void kvm_riscv_vcpu_update_config(const unsigned long *isa)
+{
+ u64 henvcfg = 0;
+
+ if (__riscv_isa_extension_available(isa, RISCV_ISA_EXT_SVPBMT))
+ henvcfg |= ENVCFG_PBMTE;
+
+ csr_write(CSR_HENVCFG, henvcfg);
+#ifdef CONFIG_32BIT
+ csr_write(CSR_HENVCFGH, henvcfg >> 32);
+#endif
+}
+
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
@@ -743,6 +805,8 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
csr_write(CSR_HVIP, csr->hvip);
csr_write(CSR_VSATP, csr->vsatp);
+ kvm_riscv_vcpu_update_config(vcpu->arch.isa);
+
kvm_riscv_gstage_update_hgatp(vcpu);
kvm_riscv_vcpu_timer_restore(vcpu);
@@ -853,22 +917,26 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
kvm_vcpu_srcu_read_lock(vcpu);
- /* Process MMIO value returned from user-space */
- if (run->exit_reason == KVM_EXIT_MMIO) {
+ switch (run->exit_reason) {
+ case KVM_EXIT_MMIO:
+ /* Process MMIO value returned from user-space */
ret = kvm_riscv_vcpu_mmio_return(vcpu, vcpu->run);
- if (ret) {
- kvm_vcpu_srcu_read_unlock(vcpu);
- return ret;
- }
- }
-
- /* Process SBI value returned from user-space */
- if (run->exit_reason == KVM_EXIT_RISCV_SBI) {
+ break;
+ case KVM_EXIT_RISCV_SBI:
+ /* Process SBI value returned from user-space */
ret = kvm_riscv_vcpu_sbi_return(vcpu, vcpu->run);
- if (ret) {
- kvm_vcpu_srcu_read_unlock(vcpu);
- return ret;
- }
+ break;
+ case KVM_EXIT_RISCV_CSR:
+ /* Process CSR value returned from user-space */
+ ret = kvm_riscv_vcpu_csr_return(vcpu, vcpu->run);
+ break;
+ default:
+ ret = 0;
+ break;
+ }
+ if (ret) {
+ kvm_vcpu_srcu_read_unlock(vcpu);
+ return ret;
}
if (run->immediate_exit) {
@@ -890,8 +958,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
kvm_riscv_check_vcpu_requests(vcpu);
- preempt_disable();
-
local_irq_disable();
/*
@@ -928,7 +994,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
kvm_request_pending(vcpu)) {
vcpu->mode = OUTSIDE_GUEST_MODE;
local_irq_enable();
- preempt_enable();
kvm_vcpu_srcu_read_lock(vcpu);
continue;
}
@@ -962,6 +1027,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
/* Syncup interrupts state with HW */
kvm_riscv_vcpu_sync_interrupts(vcpu);
+ preempt_disable();
+
/*
* We must ensure that any pending interrupts are taken before
* we exit guest timing so that timer ticks are accounted as
diff --git a/arch/riscv/kvm/vcpu_exit.c b/arch/riscv/kvm/vcpu_exit.c
index dbb09afd7546..d5c36386878a 100644
--- a/arch/riscv/kvm/vcpu_exit.c
+++ b/arch/riscv/kvm/vcpu_exit.c
@@ -6,435 +6,34 @@
* Anup Patel <anup.patel@wdc.com>
*/
-#include <linux/bitops.h>
-#include <linux/errno.h>
-#include <linux/err.h>
#include <linux/kvm_host.h>
#include <asm/csr.h>
-#define INSN_OPCODE_MASK 0x007c
-#define INSN_OPCODE_SHIFT 2
-#define INSN_OPCODE_SYSTEM 28
-
-#define INSN_MASK_WFI 0xffffffff
-#define INSN_MATCH_WFI 0x10500073
-
-#define INSN_MATCH_LB 0x3
-#define INSN_MASK_LB 0x707f
-#define INSN_MATCH_LH 0x1003
-#define INSN_MASK_LH 0x707f
-#define INSN_MATCH_LW 0x2003
-#define INSN_MASK_LW 0x707f
-#define INSN_MATCH_LD 0x3003
-#define INSN_MASK_LD 0x707f
-#define INSN_MATCH_LBU 0x4003
-#define INSN_MASK_LBU 0x707f
-#define INSN_MATCH_LHU 0x5003
-#define INSN_MASK_LHU 0x707f
-#define INSN_MATCH_LWU 0x6003
-#define INSN_MASK_LWU 0x707f
-#define INSN_MATCH_SB 0x23
-#define INSN_MASK_SB 0x707f
-#define INSN_MATCH_SH 0x1023
-#define INSN_MASK_SH 0x707f
-#define INSN_MATCH_SW 0x2023
-#define INSN_MASK_SW 0x707f
-#define INSN_MATCH_SD 0x3023
-#define INSN_MASK_SD 0x707f
-
-#define INSN_MATCH_C_LD 0x6000
-#define INSN_MASK_C_LD 0xe003
-#define INSN_MATCH_C_SD 0xe000
-#define INSN_MASK_C_SD 0xe003
-#define INSN_MATCH_C_LW 0x4000
-#define INSN_MASK_C_LW 0xe003
-#define INSN_MATCH_C_SW 0xc000
-#define INSN_MASK_C_SW 0xe003
-#define INSN_MATCH_C_LDSP 0x6002
-#define INSN_MASK_C_LDSP 0xe003
-#define INSN_MATCH_C_SDSP 0xe002
-#define INSN_MASK_C_SDSP 0xe003
-#define INSN_MATCH_C_LWSP 0x4002
-#define INSN_MASK_C_LWSP 0xe003
-#define INSN_MATCH_C_SWSP 0xc002
-#define INSN_MASK_C_SWSP 0xe003
-
-#define INSN_16BIT_MASK 0x3
-
-#define INSN_IS_16BIT(insn) (((insn) & INSN_16BIT_MASK) != INSN_16BIT_MASK)
-
-#define INSN_LEN(insn) (INSN_IS_16BIT(insn) ? 2 : 4)
-
-#ifdef CONFIG_64BIT
-#define LOG_REGBYTES 3
-#else
-#define LOG_REGBYTES 2
-#endif
-#define REGBYTES (1 << LOG_REGBYTES)
-
-#define SH_RD 7
-#define SH_RS1 15
-#define SH_RS2 20
-#define SH_RS2C 2
-
-#define RV_X(x, s, n) (((x) >> (s)) & ((1 << (n)) - 1))
-#define RVC_LW_IMM(x) ((RV_X(x, 6, 1) << 2) | \
- (RV_X(x, 10, 3) << 3) | \
- (RV_X(x, 5, 1) << 6))
-#define RVC_LD_IMM(x) ((RV_X(x, 10, 3) << 3) | \
- (RV_X(x, 5, 2) << 6))
-#define RVC_LWSP_IMM(x) ((RV_X(x, 4, 3) << 2) | \
- (RV_X(x, 12, 1) << 5) | \
- (RV_X(x, 2, 2) << 6))
-#define RVC_LDSP_IMM(x) ((RV_X(x, 5, 2) << 3) | \
- (RV_X(x, 12, 1) << 5) | \
- (RV_X(x, 2, 3) << 6))
-#define RVC_SWSP_IMM(x) ((RV_X(x, 9, 4) << 2) | \
- (RV_X(x, 7, 2) << 6))
-#define RVC_SDSP_IMM(x) ((RV_X(x, 10, 3) << 3) | \
- (RV_X(x, 7, 3) << 6))
-#define RVC_RS1S(insn) (8 + RV_X(insn, SH_RD, 3))
-#define RVC_RS2S(insn) (8 + RV_X(insn, SH_RS2C, 3))
-#define RVC_RS2(insn) RV_X(insn, SH_RS2C, 5)
-
-#define SHIFT_RIGHT(x, y) \
- ((y) < 0 ? ((x) << -(y)) : ((x) >> (y)))
-
-#define REG_MASK \
- ((1 << (5 + LOG_REGBYTES)) - (1 << LOG_REGBYTES))
-
-#define REG_OFFSET(insn, pos) \
- (SHIFT_RIGHT((insn), (pos) - LOG_REGBYTES) & REG_MASK)
-
-#define REG_PTR(insn, pos, regs) \
- ((ulong *)((ulong)(regs) + REG_OFFSET(insn, pos)))
-
-#define GET_RM(insn) (((insn) >> 12) & 7)
-
-#define GET_RS1(insn, regs) (*REG_PTR(insn, SH_RS1, regs))
-#define GET_RS2(insn, regs) (*REG_PTR(insn, SH_RS2, regs))
-#define GET_RS1S(insn, regs) (*REG_PTR(RVC_RS1S(insn), 0, regs))
-#define GET_RS2S(insn, regs) (*REG_PTR(RVC_RS2S(insn), 0, regs))
-#define GET_RS2C(insn, regs) (*REG_PTR(insn, SH_RS2C, regs))
-#define GET_SP(regs) (*REG_PTR(2, 0, regs))
-#define SET_RD(insn, regs, val) (*REG_PTR(insn, SH_RD, regs) = (val))
-#define IMM_I(insn) ((s32)(insn) >> 20)
-#define IMM_S(insn) (((s32)(insn) >> 25 << 5) | \
- (s32)(((insn) >> 7) & 0x1f))
-#define MASK_FUNCT3 0x7000
-
-static int truly_illegal_insn(struct kvm_vcpu *vcpu,
- struct kvm_run *run,
- ulong insn)
-{
- struct kvm_cpu_trap utrap = { 0 };
-
- /* Redirect trap to Guest VCPU */
- utrap.sepc = vcpu->arch.guest_context.sepc;
- utrap.scause = EXC_INST_ILLEGAL;
- utrap.stval = insn;
- kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
-
- return 1;
-}
-
-static int system_opcode_insn(struct kvm_vcpu *vcpu,
- struct kvm_run *run,
- ulong insn)
-{
- if ((insn & INSN_MASK_WFI) == INSN_MATCH_WFI) {
- vcpu->stat.wfi_exit_stat++;
- kvm_riscv_vcpu_wfi(vcpu);
- vcpu->arch.guest_context.sepc += INSN_LEN(insn);
- return 1;
- }
-
- return truly_illegal_insn(vcpu, run, insn);
-}
-
-static int virtual_inst_fault(struct kvm_vcpu *vcpu, struct kvm_run *run,
- struct kvm_cpu_trap *trap)
-{
- unsigned long insn = trap->stval;
- struct kvm_cpu_trap utrap = { 0 };
- struct kvm_cpu_context *ct;
-
- if (unlikely(INSN_IS_16BIT(insn))) {
- if (insn == 0) {
- ct = &vcpu->arch.guest_context;
- insn = kvm_riscv_vcpu_unpriv_read(vcpu, true,
- ct->sepc,
- &utrap);
- if (utrap.scause) {
- utrap.sepc = ct->sepc;
- kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
- return 1;
- }
- }
- if (INSN_IS_16BIT(insn))
- return truly_illegal_insn(vcpu, run, insn);
- }
-
- switch ((insn & INSN_OPCODE_MASK) >> INSN_OPCODE_SHIFT) {
- case INSN_OPCODE_SYSTEM:
- return system_opcode_insn(vcpu, run, insn);
- default:
- return truly_illegal_insn(vcpu, run, insn);
- }
-}
-
-static int emulate_load(struct kvm_vcpu *vcpu, struct kvm_run *run,
- unsigned long fault_addr, unsigned long htinst)
-{
- u8 data_buf[8];
- unsigned long insn;
- int shift = 0, len = 0, insn_len = 0;
- struct kvm_cpu_trap utrap = { 0 };
- struct kvm_cpu_context *ct = &vcpu->arch.guest_context;
-
- /* Determine trapped instruction */
- if (htinst & 0x1) {
- /*
- * Bit[0] == 1 implies trapped instruction value is
- * transformed instruction or custom instruction.
- */
- insn = htinst | INSN_16BIT_MASK;
- insn_len = (htinst & BIT(1)) ? INSN_LEN(insn) : 2;
- } else {
- /*
- * Bit[0] == 0 implies trapped instruction value is
- * zero or special value.
- */
- insn = kvm_riscv_vcpu_unpriv_read(vcpu, true, ct->sepc,
- &utrap);
- if (utrap.scause) {
- /* Redirect trap if we failed to read instruction */
- utrap.sepc = ct->sepc;
- kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
- return 1;
- }
- insn_len = INSN_LEN(insn);
- }
-
- /* Decode length of MMIO and shift */
- if ((insn & INSN_MASK_LW) == INSN_MATCH_LW) {
- len = 4;
- shift = 8 * (sizeof(ulong) - len);
- } else if ((insn & INSN_MASK_LB) == INSN_MATCH_LB) {
- len = 1;
- shift = 8 * (sizeof(ulong) - len);
- } else if ((insn & INSN_MASK_LBU) == INSN_MATCH_LBU) {
- len = 1;
- shift = 8 * (sizeof(ulong) - len);
-#ifdef CONFIG_64BIT
- } else if ((insn & INSN_MASK_LD) == INSN_MATCH_LD) {
- len = 8;
- shift = 8 * (sizeof(ulong) - len);
- } else if ((insn & INSN_MASK_LWU) == INSN_MATCH_LWU) {
- len = 4;
-#endif
- } else if ((insn & INSN_MASK_LH) == INSN_MATCH_LH) {
- len = 2;
- shift = 8 * (sizeof(ulong) - len);
- } else if ((insn & INSN_MASK_LHU) == INSN_MATCH_LHU) {
- len = 2;
-#ifdef CONFIG_64BIT
- } else if ((insn & INSN_MASK_C_LD) == INSN_MATCH_C_LD) {
- len = 8;
- shift = 8 * (sizeof(ulong) - len);
- insn = RVC_RS2S(insn) << SH_RD;
- } else if ((insn & INSN_MASK_C_LDSP) == INSN_MATCH_C_LDSP &&
- ((insn >> SH_RD) & 0x1f)) {
- len = 8;
- shift = 8 * (sizeof(ulong) - len);
-#endif
- } else if ((insn & INSN_MASK_C_LW) == INSN_MATCH_C_LW) {
- len = 4;
- shift = 8 * (sizeof(ulong) - len);
- insn = RVC_RS2S(insn) << SH_RD;
- } else if ((insn & INSN_MASK_C_LWSP) == INSN_MATCH_C_LWSP &&
- ((insn >> SH_RD) & 0x1f)) {
- len = 4;
- shift = 8 * (sizeof(ulong) - len);
- } else {
- return -EOPNOTSUPP;
- }
-
- /* Fault address should be aligned to length of MMIO */
- if (fault_addr & (len - 1))
- return -EIO;
-
- /* Save instruction decode info */
- vcpu->arch.mmio_decode.insn = insn;
- vcpu->arch.mmio_decode.insn_len = insn_len;
- vcpu->arch.mmio_decode.shift = shift;
- vcpu->arch.mmio_decode.len = len;
- vcpu->arch.mmio_decode.return_handled = 0;
-
- /* Update MMIO details in kvm_run struct */
- run->mmio.is_write = false;
- run->mmio.phys_addr = fault_addr;
- run->mmio.len = len;
-
- /* Try to handle MMIO access in the kernel */
- if (!kvm_io_bus_read(vcpu, KVM_MMIO_BUS, fault_addr, len, data_buf)) {
- /* Successfully handled MMIO access in the kernel so resume */
- memcpy(run->mmio.data, data_buf, len);
- vcpu->stat.mmio_exit_kernel++;
- kvm_riscv_vcpu_mmio_return(vcpu, run);
- return 1;
- }
-
- /* Exit to userspace for MMIO emulation */
- vcpu->stat.mmio_exit_user++;
- run->exit_reason = KVM_EXIT_MMIO;
-
- return 0;
-}
-
-static int emulate_store(struct kvm_vcpu *vcpu, struct kvm_run *run,
- unsigned long fault_addr, unsigned long htinst)
-{
- u8 data8;
- u16 data16;
- u32 data32;
- u64 data64;
- ulong data;
- unsigned long insn;
- int len = 0, insn_len = 0;
- struct kvm_cpu_trap utrap = { 0 };
- struct kvm_cpu_context *ct = &vcpu->arch.guest_context;
-
- /* Determine trapped instruction */
- if (htinst & 0x1) {
- /*
- * Bit[0] == 1 implies trapped instruction value is
- * transformed instruction or custom instruction.
- */
- insn = htinst | INSN_16BIT_MASK;
- insn_len = (htinst & BIT(1)) ? INSN_LEN(insn) : 2;
- } else {
- /*
- * Bit[0] == 0 implies trapped instruction value is
- * zero or special value.
- */
- insn = kvm_riscv_vcpu_unpriv_read(vcpu, true, ct->sepc,
- &utrap);
- if (utrap.scause) {
- /* Redirect trap if we failed to read instruction */
- utrap.sepc = ct->sepc;
- kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
- return 1;
- }
- insn_len = INSN_LEN(insn);
- }
-
- data = GET_RS2(insn, &vcpu->arch.guest_context);
- data8 = data16 = data32 = data64 = data;
-
- if ((insn & INSN_MASK_SW) == INSN_MATCH_SW) {
- len = 4;
- } else if ((insn & INSN_MASK_SB) == INSN_MATCH_SB) {
- len = 1;
-#ifdef CONFIG_64BIT
- } else if ((insn & INSN_MASK_SD) == INSN_MATCH_SD) {
- len = 8;
-#endif
- } else if ((insn & INSN_MASK_SH) == INSN_MATCH_SH) {
- len = 2;
-#ifdef CONFIG_64BIT
- } else if ((insn & INSN_MASK_C_SD) == INSN_MATCH_C_SD) {
- len = 8;
- data64 = GET_RS2S(insn, &vcpu->arch.guest_context);
- } else if ((insn & INSN_MASK_C_SDSP) == INSN_MATCH_C_SDSP &&
- ((insn >> SH_RD) & 0x1f)) {
- len = 8;
- data64 = GET_RS2C(insn, &vcpu->arch.guest_context);
-#endif
- } else if ((insn & INSN_MASK_C_SW) == INSN_MATCH_C_SW) {
- len = 4;
- data32 = GET_RS2S(insn, &vcpu->arch.guest_context);
- } else if ((insn & INSN_MASK_C_SWSP) == INSN_MATCH_C_SWSP &&
- ((insn >> SH_RD) & 0x1f)) {
- len = 4;
- data32 = GET_RS2C(insn, &vcpu->arch.guest_context);
- } else {
- return -EOPNOTSUPP;
- }
-
- /* Fault address should be aligned to length of MMIO */
- if (fault_addr & (len - 1))
- return -EIO;
-
- /* Save instruction decode info */
- vcpu->arch.mmio_decode.insn = insn;
- vcpu->arch.mmio_decode.insn_len = insn_len;
- vcpu->arch.mmio_decode.shift = 0;
- vcpu->arch.mmio_decode.len = len;
- vcpu->arch.mmio_decode.return_handled = 0;
-
- /* Copy data to kvm_run instance */
- switch (len) {
- case 1:
- *((u8 *)run->mmio.data) = data8;
- break;
- case 2:
- *((u16 *)run->mmio.data) = data16;
- break;
- case 4:
- *((u32 *)run->mmio.data) = data32;
- break;
- case 8:
- *((u64 *)run->mmio.data) = data64;
- break;
- default:
- return -EOPNOTSUPP;
- }
-
- /* Update MMIO details in kvm_run struct */
- run->mmio.is_write = true;
- run->mmio.phys_addr = fault_addr;
- run->mmio.len = len;
-
- /* Try to handle MMIO access in the kernel */
- if (!kvm_io_bus_write(vcpu, KVM_MMIO_BUS,
- fault_addr, len, run->mmio.data)) {
- /* Successfully handled MMIO access in the kernel so resume */
- vcpu->stat.mmio_exit_kernel++;
- kvm_riscv_vcpu_mmio_return(vcpu, run);
- return 1;
- }
-
- /* Exit to userspace for MMIO emulation */
- vcpu->stat.mmio_exit_user++;
- run->exit_reason = KVM_EXIT_MMIO;
-
- return 0;
-}
-
static int gstage_page_fault(struct kvm_vcpu *vcpu, struct kvm_run *run,
struct kvm_cpu_trap *trap)
{
struct kvm_memory_slot *memslot;
unsigned long hva, fault_addr;
- bool writeable;
+ bool writable;
gfn_t gfn;
int ret;
fault_addr = (trap->htval << 2) | (trap->stval & 0x3);
gfn = fault_addr >> PAGE_SHIFT;
memslot = gfn_to_memslot(vcpu->kvm, gfn);
- hva = gfn_to_hva_memslot_prot(memslot, gfn, &writeable);
+ hva = gfn_to_hva_memslot_prot(memslot, gfn, &writable);
if (kvm_is_error_hva(hva) ||
- (trap->scause == EXC_STORE_GUEST_PAGE_FAULT && !writeable)) {
+ (trap->scause == EXC_STORE_GUEST_PAGE_FAULT && !writable)) {
switch (trap->scause) {
case EXC_LOAD_GUEST_PAGE_FAULT:
- return emulate_load(vcpu, run, fault_addr,
- trap->htinst);
+ return kvm_riscv_vcpu_mmio_load(vcpu, run,
+ fault_addr,
+ trap->htinst);
case EXC_STORE_GUEST_PAGE_FAULT:
- return emulate_store(vcpu, run, fault_addr,
- trap->htinst);
+ return kvm_riscv_vcpu_mmio_store(vcpu, run,
+ fault_addr,
+ trap->htinst);
default:
return -EOPNOTSUPP;
};
@@ -449,21 +48,6 @@ static int gstage_page_fault(struct kvm_vcpu *vcpu, struct kvm_run *run,
}
/**
- * kvm_riscv_vcpu_wfi -- Emulate wait for interrupt (WFI) behaviour
- *
- * @vcpu: The VCPU pointer
- */
-void kvm_riscv_vcpu_wfi(struct kvm_vcpu *vcpu)
-{
- if (!kvm_arch_vcpu_runnable(vcpu)) {
- kvm_vcpu_srcu_read_unlock(vcpu);
- kvm_vcpu_halt(vcpu);
- kvm_vcpu_srcu_read_lock(vcpu);
- kvm_clear_request(KVM_REQ_UNHALT, vcpu);
- }
-}
-
-/**
* kvm_riscv_vcpu_unpriv_read -- Read machine word from Guest memory
*
* @vcpu: The VCPU pointer
@@ -601,66 +185,6 @@ void kvm_riscv_vcpu_trap_redirect(struct kvm_vcpu *vcpu,
vcpu->arch.guest_context.sepc = csr_read(CSR_VSTVEC);
}
-/**
- * kvm_riscv_vcpu_mmio_return -- Handle MMIO loads after user space emulation
- * or in-kernel IO emulation
- *
- * @vcpu: The VCPU pointer
- * @run: The VCPU run struct containing the mmio data
- */
-int kvm_riscv_vcpu_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
-{
- u8 data8;
- u16 data16;
- u32 data32;
- u64 data64;
- ulong insn;
- int len, shift;
-
- if (vcpu->arch.mmio_decode.return_handled)
- return 0;
-
- vcpu->arch.mmio_decode.return_handled = 1;
- insn = vcpu->arch.mmio_decode.insn;
-
- if (run->mmio.is_write)
- goto done;
-
- len = vcpu->arch.mmio_decode.len;
- shift = vcpu->arch.mmio_decode.shift;
-
- switch (len) {
- case 1:
- data8 = *((u8 *)run->mmio.data);
- SET_RD(insn, &vcpu->arch.guest_context,
- (ulong)data8 << shift >> shift);
- break;
- case 2:
- data16 = *((u16 *)run->mmio.data);
- SET_RD(insn, &vcpu->arch.guest_context,
- (ulong)data16 << shift >> shift);
- break;
- case 4:
- data32 = *((u32 *)run->mmio.data);
- SET_RD(insn, &vcpu->arch.guest_context,
- (ulong)data32 << shift >> shift);
- break;
- case 8:
- data64 = *((u64 *)run->mmio.data);
- SET_RD(insn, &vcpu->arch.guest_context,
- (ulong)data64 << shift >> shift);
- break;
- default:
- return -EOPNOTSUPP;
- }
-
-done:
- /* Move to next instruction */
- vcpu->arch.guest_context.sepc += vcpu->arch.mmio_decode.insn_len;
-
- return 0;
-}
-
/*
* Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
* proper exit to userspace.
@@ -680,7 +204,7 @@ int kvm_riscv_vcpu_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
switch (trap->scause) {
case EXC_VIRTUAL_INST_FAULT:
if (vcpu->arch.guest_context.hstatus & HSTATUS_SPV)
- ret = virtual_inst_fault(vcpu, run, trap);
+ ret = kvm_riscv_vcpu_virtual_insn(vcpu, run, trap);
break;
case EXC_INST_GUEST_PAGE_FAULT:
case EXC_LOAD_GUEST_PAGE_FAULT:
diff --git a/arch/riscv/kvm/vcpu_fp.c b/arch/riscv/kvm/vcpu_fp.c
index d4308c512007..9d8cbc42057a 100644
--- a/arch/riscv/kvm/vcpu_fp.c
+++ b/arch/riscv/kvm/vcpu_fp.c
@@ -16,12 +16,11 @@
#ifdef CONFIG_FPU
void kvm_riscv_vcpu_fp_reset(struct kvm_vcpu *vcpu)
{
- unsigned long isa = vcpu->arch.isa;
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
cntx->sstatus &= ~SR_FS;
- if (riscv_isa_extension_available(&isa, f) ||
- riscv_isa_extension_available(&isa, d))
+ if (riscv_isa_extension_available(vcpu->arch.isa, f) ||
+ riscv_isa_extension_available(vcpu->arch.isa, d))
cntx->sstatus |= SR_FS_INITIAL;
else
cntx->sstatus |= SR_FS_OFF;
@@ -34,24 +33,24 @@ static void kvm_riscv_vcpu_fp_clean(struct kvm_cpu_context *cntx)
}
void kvm_riscv_vcpu_guest_fp_save(struct kvm_cpu_context *cntx,
- unsigned long isa)
+ const unsigned long *isa)
{
if ((cntx->sstatus & SR_FS) == SR_FS_DIRTY) {
- if (riscv_isa_extension_available(&isa, d))
+ if (riscv_isa_extension_available(isa, d))
__kvm_riscv_fp_d_save(cntx);
- else if (riscv_isa_extension_available(&isa, f))
+ else if (riscv_isa_extension_available(isa, f))
__kvm_riscv_fp_f_save(cntx);
kvm_riscv_vcpu_fp_clean(cntx);
}
}
void kvm_riscv_vcpu_guest_fp_restore(struct kvm_cpu_context *cntx,
- unsigned long isa)
+ const unsigned long *isa)
{
if ((cntx->sstatus & SR_FS) != SR_FS_OFF) {
- if (riscv_isa_extension_available(&isa, d))
+ if (riscv_isa_extension_available(isa, d))
__kvm_riscv_fp_d_restore(cntx);
- else if (riscv_isa_extension_available(&isa, f))
+ else if (riscv_isa_extension_available(isa, f))
__kvm_riscv_fp_f_restore(cntx);
kvm_riscv_vcpu_fp_clean(cntx);
}
@@ -80,7 +79,6 @@ int kvm_riscv_vcpu_get_reg_fp(struct kvm_vcpu *vcpu,
unsigned long rtype)
{
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
- unsigned long isa = vcpu->arch.isa;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
@@ -89,7 +87,7 @@ int kvm_riscv_vcpu_get_reg_fp(struct kvm_vcpu *vcpu,
void *reg_val;
if ((rtype == KVM_REG_RISCV_FP_F) &&
- riscv_isa_extension_available(&isa, f)) {
+ riscv_isa_extension_available(vcpu->arch.isa, f)) {
if (KVM_REG_SIZE(reg->id) != sizeof(u32))
return -EINVAL;
if (reg_num == KVM_REG_RISCV_FP_F_REG(fcsr))
@@ -100,7 +98,7 @@ int kvm_riscv_vcpu_get_reg_fp(struct kvm_vcpu *vcpu,
else
return -EINVAL;
} else if ((rtype == KVM_REG_RISCV_FP_D) &&
- riscv_isa_extension_available(&isa, d)) {
+ riscv_isa_extension_available(vcpu->arch.isa, d)) {
if (reg_num == KVM_REG_RISCV_FP_D_REG(fcsr)) {
if (KVM_REG_SIZE(reg->id) != sizeof(u32))
return -EINVAL;
@@ -126,7 +124,6 @@ int kvm_riscv_vcpu_set_reg_fp(struct kvm_vcpu *vcpu,
unsigned long rtype)
{
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
- unsigned long isa = vcpu->arch.isa;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
@@ -135,7 +132,7 @@ int kvm_riscv_vcpu_set_reg_fp(struct kvm_vcpu *vcpu,
void *reg_val;
if ((rtype == KVM_REG_RISCV_FP_F) &&
- riscv_isa_extension_available(&isa, f)) {
+ riscv_isa_extension_available(vcpu->arch.isa, f)) {
if (KVM_REG_SIZE(reg->id) != sizeof(u32))
return -EINVAL;
if (reg_num == KVM_REG_RISCV_FP_F_REG(fcsr))
@@ -146,7 +143,7 @@ int kvm_riscv_vcpu_set_reg_fp(struct kvm_vcpu *vcpu,
else
return -EINVAL;
} else if ((rtype == KVM_REG_RISCV_FP_D) &&
- riscv_isa_extension_available(&isa, d)) {
+ riscv_isa_extension_available(vcpu->arch.isa, d)) {
if (reg_num == KVM_REG_RISCV_FP_D_REG(fcsr)) {
if (KVM_REG_SIZE(reg->id) != sizeof(u32))
return -EINVAL;
diff --git a/arch/riscv/kvm/vcpu_insn.c b/arch/riscv/kvm/vcpu_insn.c
new file mode 100644
index 000000000000..7eb90a47b571
--- /dev/null
+++ b/arch/riscv/kvm/vcpu_insn.c
@@ -0,0 +1,752 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 Western Digital Corporation or its affiliates.
+ * Copyright (c) 2022 Ventana Micro Systems Inc.
+ */
+
+#include <linux/bitops.h>
+#include <linux/kvm_host.h>
+
+#define INSN_OPCODE_MASK 0x007c
+#define INSN_OPCODE_SHIFT 2
+#define INSN_OPCODE_SYSTEM 28
+
+#define INSN_MASK_WFI 0xffffffff
+#define INSN_MATCH_WFI 0x10500073
+
+#define INSN_MATCH_CSRRW 0x1073
+#define INSN_MASK_CSRRW 0x707f
+#define INSN_MATCH_CSRRS 0x2073
+#define INSN_MASK_CSRRS 0x707f
+#define INSN_MATCH_CSRRC 0x3073
+#define INSN_MASK_CSRRC 0x707f
+#define INSN_MATCH_CSRRWI 0x5073
+#define INSN_MASK_CSRRWI 0x707f
+#define INSN_MATCH_CSRRSI 0x6073
+#define INSN_MASK_CSRRSI 0x707f
+#define INSN_MATCH_CSRRCI 0x7073
+#define INSN_MASK_CSRRCI 0x707f
+
+#define INSN_MATCH_LB 0x3
+#define INSN_MASK_LB 0x707f
+#define INSN_MATCH_LH 0x1003
+#define INSN_MASK_LH 0x707f
+#define INSN_MATCH_LW 0x2003
+#define INSN_MASK_LW 0x707f
+#define INSN_MATCH_LD 0x3003
+#define INSN_MASK_LD 0x707f
+#define INSN_MATCH_LBU 0x4003
+#define INSN_MASK_LBU 0x707f
+#define INSN_MATCH_LHU 0x5003
+#define INSN_MASK_LHU 0x707f
+#define INSN_MATCH_LWU 0x6003
+#define INSN_MASK_LWU 0x707f
+#define INSN_MATCH_SB 0x23
+#define INSN_MASK_SB 0x707f
+#define INSN_MATCH_SH 0x1023
+#define INSN_MASK_SH 0x707f
+#define INSN_MATCH_SW 0x2023
+#define INSN_MASK_SW 0x707f
+#define INSN_MATCH_SD 0x3023
+#define INSN_MASK_SD 0x707f
+
+#define INSN_MATCH_C_LD 0x6000
+#define INSN_MASK_C_LD 0xe003
+#define INSN_MATCH_C_SD 0xe000
+#define INSN_MASK_C_SD 0xe003
+#define INSN_MATCH_C_LW 0x4000
+#define INSN_MASK_C_LW 0xe003
+#define INSN_MATCH_C_SW 0xc000
+#define INSN_MASK_C_SW 0xe003
+#define INSN_MATCH_C_LDSP 0x6002
+#define INSN_MASK_C_LDSP 0xe003
+#define INSN_MATCH_C_SDSP 0xe002
+#define INSN_MASK_C_SDSP 0xe003
+#define INSN_MATCH_C_LWSP 0x4002
+#define INSN_MASK_C_LWSP 0xe003
+#define INSN_MATCH_C_SWSP 0xc002
+#define INSN_MASK_C_SWSP 0xe003
+
+#define INSN_16BIT_MASK 0x3
+
+#define INSN_IS_16BIT(insn) (((insn) & INSN_16BIT_MASK) != INSN_16BIT_MASK)
+
+#define INSN_LEN(insn) (INSN_IS_16BIT(insn) ? 2 : 4)
+
+#ifdef CONFIG_64BIT
+#define LOG_REGBYTES 3
+#else
+#define LOG_REGBYTES 2
+#endif
+#define REGBYTES (1 << LOG_REGBYTES)
+
+#define SH_RD 7
+#define SH_RS1 15
+#define SH_RS2 20
+#define SH_RS2C 2
+#define MASK_RX 0x1f
+
+#define RV_X(x, s, n) (((x) >> (s)) & ((1 << (n)) - 1))
+#define RVC_LW_IMM(x) ((RV_X(x, 6, 1) << 2) | \
+ (RV_X(x, 10, 3) << 3) | \
+ (RV_X(x, 5, 1) << 6))
+#define RVC_LD_IMM(x) ((RV_X(x, 10, 3) << 3) | \
+ (RV_X(x, 5, 2) << 6))
+#define RVC_LWSP_IMM(x) ((RV_X(x, 4, 3) << 2) | \
+ (RV_X(x, 12, 1) << 5) | \
+ (RV_X(x, 2, 2) << 6))
+#define RVC_LDSP_IMM(x) ((RV_X(x, 5, 2) << 3) | \
+ (RV_X(x, 12, 1) << 5) | \
+ (RV_X(x, 2, 3) << 6))
+#define RVC_SWSP_IMM(x) ((RV_X(x, 9, 4) << 2) | \
+ (RV_X(x, 7, 2) << 6))
+#define RVC_SDSP_IMM(x) ((RV_X(x, 10, 3) << 3) | \
+ (RV_X(x, 7, 3) << 6))
+#define RVC_RS1S(insn) (8 + RV_X(insn, SH_RD, 3))
+#define RVC_RS2S(insn) (8 + RV_X(insn, SH_RS2C, 3))
+#define RVC_RS2(insn) RV_X(insn, SH_RS2C, 5)
+
+#define SHIFT_RIGHT(x, y) \
+ ((y) < 0 ? ((x) << -(y)) : ((x) >> (y)))
+
+#define REG_MASK \
+ ((1 << (5 + LOG_REGBYTES)) - (1 << LOG_REGBYTES))
+
+#define REG_OFFSET(insn, pos) \
+ (SHIFT_RIGHT((insn), (pos) - LOG_REGBYTES) & REG_MASK)
+
+#define REG_PTR(insn, pos, regs) \
+ ((ulong *)((ulong)(regs) + REG_OFFSET(insn, pos)))
+
+#define GET_FUNCT3(insn) (((insn) >> 12) & 7)
+
+#define GET_RS1(insn, regs) (*REG_PTR(insn, SH_RS1, regs))
+#define GET_RS2(insn, regs) (*REG_PTR(insn, SH_RS2, regs))
+#define GET_RS1S(insn, regs) (*REG_PTR(RVC_RS1S(insn), 0, regs))
+#define GET_RS2S(insn, regs) (*REG_PTR(RVC_RS2S(insn), 0, regs))
+#define GET_RS2C(insn, regs) (*REG_PTR(insn, SH_RS2C, regs))
+#define GET_SP(regs) (*REG_PTR(2, 0, regs))
+#define SET_RD(insn, regs, val) (*REG_PTR(insn, SH_RD, regs) = (val))
+#define IMM_I(insn) ((s32)(insn) >> 20)
+#define IMM_S(insn) (((s32)(insn) >> 25 << 5) | \
+ (s32)(((insn) >> 7) & 0x1f))
+
+struct insn_func {
+ unsigned long mask;
+ unsigned long match;
+ /*
+ * Possible return values are as follows:
+ * 1) Returns < 0 for error case
+ * 2) Returns 0 for exit to user-space
+ * 3) Returns 1 to continue with next sepc
+ * 4) Returns 2 to continue with same sepc
+ * 5) Returns 3 to inject illegal instruction trap and continue
+ * 6) Returns 4 to inject virtual instruction trap and continue
+ *
+ * Use enum kvm_insn_return for return values
+ */
+ int (*func)(struct kvm_vcpu *vcpu, struct kvm_run *run, ulong insn);
+};
+
+static int truly_illegal_insn(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ ulong insn)
+{
+ struct kvm_cpu_trap utrap = { 0 };
+
+ /* Redirect trap to Guest VCPU */
+ utrap.sepc = vcpu->arch.guest_context.sepc;
+ utrap.scause = EXC_INST_ILLEGAL;
+ utrap.stval = insn;
+ utrap.htval = 0;
+ utrap.htinst = 0;
+ kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
+
+ return 1;
+}
+
+static int truly_virtual_insn(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ ulong insn)
+{
+ struct kvm_cpu_trap utrap = { 0 };
+
+ /* Redirect trap to Guest VCPU */
+ utrap.sepc = vcpu->arch.guest_context.sepc;
+ utrap.scause = EXC_VIRTUAL_INST_FAULT;
+ utrap.stval = insn;
+ utrap.htval = 0;
+ utrap.htinst = 0;
+ kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
+
+ return 1;
+}
+
+/**
+ * kvm_riscv_vcpu_wfi -- Emulate wait for interrupt (WFI) behaviour
+ *
+ * @vcpu: The VCPU pointer
+ */
+void kvm_riscv_vcpu_wfi(struct kvm_vcpu *vcpu)
+{
+ if (!kvm_arch_vcpu_runnable(vcpu)) {
+ kvm_vcpu_srcu_read_unlock(vcpu);
+ kvm_vcpu_halt(vcpu);
+ kvm_vcpu_srcu_read_lock(vcpu);
+ kvm_clear_request(KVM_REQ_UNHALT, vcpu);
+ }
+}
+
+static int wfi_insn(struct kvm_vcpu *vcpu, struct kvm_run *run, ulong insn)
+{
+ vcpu->stat.wfi_exit_stat++;
+ kvm_riscv_vcpu_wfi(vcpu);
+ return KVM_INSN_CONTINUE_NEXT_SEPC;
+}
+
+struct csr_func {
+ unsigned int base;
+ unsigned int count;
+ /*
+ * Possible return values are as same as "func" callback in
+ * "struct insn_func".
+ */
+ int (*func)(struct kvm_vcpu *vcpu, unsigned int csr_num,
+ unsigned long *val, unsigned long new_val,
+ unsigned long wr_mask);
+};
+
+static const struct csr_func csr_funcs[] = { };
+
+/**
+ * kvm_riscv_vcpu_csr_return -- Handle CSR read/write after user space
+ * emulation or in-kernel emulation
+ *
+ * @vcpu: The VCPU pointer
+ * @run: The VCPU run struct containing the CSR data
+ *
+ * Returns > 0 upon failure and 0 upon success
+ */
+int kvm_riscv_vcpu_csr_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+ ulong insn;
+
+ if (vcpu->arch.csr_decode.return_handled)
+ return 0;
+ vcpu->arch.csr_decode.return_handled = 1;
+
+ /* Update destination register for CSR reads */
+ insn = vcpu->arch.csr_decode.insn;
+ if ((insn >> SH_RD) & MASK_RX)
+ SET_RD(insn, &vcpu->arch.guest_context,
+ run->riscv_csr.ret_value);
+
+ /* Move to next instruction */
+ vcpu->arch.guest_context.sepc += INSN_LEN(insn);
+
+ return 0;
+}
+
+static int csr_insn(struct kvm_vcpu *vcpu, struct kvm_run *run, ulong insn)
+{
+ int i, rc = KVM_INSN_ILLEGAL_TRAP;
+ unsigned int csr_num = insn >> SH_RS2;
+ unsigned int rs1_num = (insn >> SH_RS1) & MASK_RX;
+ ulong rs1_val = GET_RS1(insn, &vcpu->arch.guest_context);
+ const struct csr_func *tcfn, *cfn = NULL;
+ ulong val = 0, wr_mask = 0, new_val = 0;
+
+ /* Decode the CSR instruction */
+ switch (GET_FUNCT3(insn)) {
+ case GET_FUNCT3(INSN_MATCH_CSRRW):
+ wr_mask = -1UL;
+ new_val = rs1_val;
+ break;
+ case GET_FUNCT3(INSN_MATCH_CSRRS):
+ wr_mask = rs1_val;
+ new_val = -1UL;
+ break;
+ case GET_FUNCT3(INSN_MATCH_CSRRC):
+ wr_mask = rs1_val;
+ new_val = 0;
+ break;
+ case GET_FUNCT3(INSN_MATCH_CSRRWI):
+ wr_mask = -1UL;
+ new_val = rs1_num;
+ break;
+ case GET_FUNCT3(INSN_MATCH_CSRRSI):
+ wr_mask = rs1_num;
+ new_val = -1UL;
+ break;
+ case GET_FUNCT3(INSN_MATCH_CSRRCI):
+ wr_mask = rs1_num;
+ new_val = 0;
+ break;
+ default:
+ return rc;
+ }
+
+ /* Save instruction decode info */
+ vcpu->arch.csr_decode.insn = insn;
+ vcpu->arch.csr_decode.return_handled = 0;
+
+ /* Update CSR details in kvm_run struct */
+ run->riscv_csr.csr_num = csr_num;
+ run->riscv_csr.new_value = new_val;
+ run->riscv_csr.write_mask = wr_mask;
+ run->riscv_csr.ret_value = 0;
+
+ /* Find in-kernel CSR function */
+ for (i = 0; i < ARRAY_SIZE(csr_funcs); i++) {
+ tcfn = &csr_funcs[i];
+ if ((tcfn->base <= csr_num) &&
+ (csr_num < (tcfn->base + tcfn->count))) {
+ cfn = tcfn;
+ break;
+ }
+ }
+
+ /* First try in-kernel CSR emulation */
+ if (cfn && cfn->func) {
+ rc = cfn->func(vcpu, csr_num, &val, new_val, wr_mask);
+ if (rc > KVM_INSN_EXIT_TO_USER_SPACE) {
+ if (rc == KVM_INSN_CONTINUE_NEXT_SEPC) {
+ run->riscv_csr.ret_value = val;
+ vcpu->stat.csr_exit_kernel++;
+ kvm_riscv_vcpu_csr_return(vcpu, run);
+ rc = KVM_INSN_CONTINUE_SAME_SEPC;
+ }
+ return rc;
+ }
+ }
+
+ /* Exit to user-space for CSR emulation */
+ if (rc <= KVM_INSN_EXIT_TO_USER_SPACE) {
+ vcpu->stat.csr_exit_user++;
+ run->exit_reason = KVM_EXIT_RISCV_CSR;
+ }
+
+ return rc;
+}
+
+static const struct insn_func system_opcode_funcs[] = {
+ {
+ .mask = INSN_MASK_CSRRW,
+ .match = INSN_MATCH_CSRRW,
+ .func = csr_insn,
+ },
+ {
+ .mask = INSN_MASK_CSRRS,
+ .match = INSN_MATCH_CSRRS,
+ .func = csr_insn,
+ },
+ {
+ .mask = INSN_MASK_CSRRC,
+ .match = INSN_MATCH_CSRRC,
+ .func = csr_insn,
+ },
+ {
+ .mask = INSN_MASK_CSRRWI,
+ .match = INSN_MATCH_CSRRWI,
+ .func = csr_insn,
+ },
+ {
+ .mask = INSN_MASK_CSRRSI,
+ .match = INSN_MATCH_CSRRSI,
+ .func = csr_insn,
+ },
+ {
+ .mask = INSN_MASK_CSRRCI,
+ .match = INSN_MATCH_CSRRCI,
+ .func = csr_insn,
+ },
+ {
+ .mask = INSN_MASK_WFI,
+ .match = INSN_MATCH_WFI,
+ .func = wfi_insn,
+ },
+};
+
+static int system_opcode_insn(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ ulong insn)
+{
+ int i, rc = KVM_INSN_ILLEGAL_TRAP;
+ const struct insn_func *ifn;
+
+ for (i = 0; i < ARRAY_SIZE(system_opcode_funcs); i++) {
+ ifn = &system_opcode_funcs[i];
+ if ((insn & ifn->mask) == ifn->match) {
+ rc = ifn->func(vcpu, run, insn);
+ break;
+ }
+ }
+
+ switch (rc) {
+ case KVM_INSN_ILLEGAL_TRAP:
+ return truly_illegal_insn(vcpu, run, insn);
+ case KVM_INSN_VIRTUAL_TRAP:
+ return truly_virtual_insn(vcpu, run, insn);
+ case KVM_INSN_CONTINUE_NEXT_SEPC:
+ vcpu->arch.guest_context.sepc += INSN_LEN(insn);
+ break;
+ default:
+ break;
+ }
+
+ return (rc <= 0) ? rc : 1;
+}
+
+/**
+ * kvm_riscv_vcpu_virtual_insn -- Handle virtual instruction trap
+ *
+ * @vcpu: The VCPU pointer
+ * @run: The VCPU run struct containing the mmio data
+ * @trap: Trap details
+ *
+ * Returns > 0 to continue run-loop
+ * Returns 0 to exit run-loop and handle in user-space.
+ * Returns < 0 to report failure and exit run-loop
+ */
+int kvm_riscv_vcpu_virtual_insn(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ struct kvm_cpu_trap *trap)
+{
+ unsigned long insn = trap->stval;
+ struct kvm_cpu_trap utrap = { 0 };
+ struct kvm_cpu_context *ct;
+
+ if (unlikely(INSN_IS_16BIT(insn))) {
+ if (insn == 0) {
+ ct = &vcpu->arch.guest_context;
+ insn = kvm_riscv_vcpu_unpriv_read(vcpu, true,
+ ct->sepc,
+ &utrap);
+ if (utrap.scause) {
+ utrap.sepc = ct->sepc;
+ kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
+ return 1;
+ }
+ }
+ if (INSN_IS_16BIT(insn))
+ return truly_illegal_insn(vcpu, run, insn);
+ }
+
+ switch ((insn & INSN_OPCODE_MASK) >> INSN_OPCODE_SHIFT) {
+ case INSN_OPCODE_SYSTEM:
+ return system_opcode_insn(vcpu, run, insn);
+ default:
+ return truly_illegal_insn(vcpu, run, insn);
+ }
+}
+
+/**
+ * kvm_riscv_vcpu_mmio_load -- Emulate MMIO load instruction
+ *
+ * @vcpu: The VCPU pointer
+ * @run: The VCPU run struct containing the mmio data
+ * @fault_addr: Guest physical address to load
+ * @htinst: Transformed encoding of the load instruction
+ *
+ * Returns > 0 to continue run-loop
+ * Returns 0 to exit run-loop and handle in user-space.
+ * Returns < 0 to report failure and exit run-loop
+ */
+int kvm_riscv_vcpu_mmio_load(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ unsigned long fault_addr,
+ unsigned long htinst)
+{
+ u8 data_buf[8];
+ unsigned long insn;
+ int shift = 0, len = 0, insn_len = 0;
+ struct kvm_cpu_trap utrap = { 0 };
+ struct kvm_cpu_context *ct = &vcpu->arch.guest_context;
+
+ /* Determine trapped instruction */
+ if (htinst & 0x1) {
+ /*
+ * Bit[0] == 1 implies trapped instruction value is
+ * transformed instruction or custom instruction.
+ */
+ insn = htinst | INSN_16BIT_MASK;
+ insn_len = (htinst & BIT(1)) ? INSN_LEN(insn) : 2;
+ } else {
+ /*
+ * Bit[0] == 0 implies trapped instruction value is
+ * zero or special value.
+ */
+ insn = kvm_riscv_vcpu_unpriv_read(vcpu, true, ct->sepc,
+ &utrap);
+ if (utrap.scause) {
+ /* Redirect trap if we failed to read instruction */
+ utrap.sepc = ct->sepc;
+ kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
+ return 1;
+ }
+ insn_len = INSN_LEN(insn);
+ }
+
+ /* Decode length of MMIO and shift */
+ if ((insn & INSN_MASK_LW) == INSN_MATCH_LW) {
+ len = 4;
+ shift = 8 * (sizeof(ulong) - len);
+ } else if ((insn & INSN_MASK_LB) == INSN_MATCH_LB) {
+ len = 1;
+ shift = 8 * (sizeof(ulong) - len);
+ } else if ((insn & INSN_MASK_LBU) == INSN_MATCH_LBU) {
+ len = 1;
+ shift = 8 * (sizeof(ulong) - len);
+#ifdef CONFIG_64BIT
+ } else if ((insn & INSN_MASK_LD) == INSN_MATCH_LD) {
+ len = 8;
+ shift = 8 * (sizeof(ulong) - len);
+ } else if ((insn & INSN_MASK_LWU) == INSN_MATCH_LWU) {
+ len = 4;
+#endif
+ } else if ((insn & INSN_MASK_LH) == INSN_MATCH_LH) {
+ len = 2;
+ shift = 8 * (sizeof(ulong) - len);
+ } else if ((insn & INSN_MASK_LHU) == INSN_MATCH_LHU) {
+ len = 2;
+#ifdef CONFIG_64BIT
+ } else if ((insn & INSN_MASK_C_LD) == INSN_MATCH_C_LD) {
+ len = 8;
+ shift = 8 * (sizeof(ulong) - len);
+ insn = RVC_RS2S(insn) << SH_RD;
+ } else if ((insn & INSN_MASK_C_LDSP) == INSN_MATCH_C_LDSP &&
+ ((insn >> SH_RD) & 0x1f)) {
+ len = 8;
+ shift = 8 * (sizeof(ulong) - len);
+#endif
+ } else if ((insn & INSN_MASK_C_LW) == INSN_MATCH_C_LW) {
+ len = 4;
+ shift = 8 * (sizeof(ulong) - len);
+ insn = RVC_RS2S(insn) << SH_RD;
+ } else if ((insn & INSN_MASK_C_LWSP) == INSN_MATCH_C_LWSP &&
+ ((insn >> SH_RD) & 0x1f)) {
+ len = 4;
+ shift = 8 * (sizeof(ulong) - len);
+ } else {
+ return -EOPNOTSUPP;
+ }
+
+ /* Fault address should be aligned to length of MMIO */
+ if (fault_addr & (len - 1))
+ return -EIO;
+
+ /* Save instruction decode info */
+ vcpu->arch.mmio_decode.insn = insn;
+ vcpu->arch.mmio_decode.insn_len = insn_len;
+ vcpu->arch.mmio_decode.shift = shift;
+ vcpu->arch.mmio_decode.len = len;
+ vcpu->arch.mmio_decode.return_handled = 0;
+
+ /* Update MMIO details in kvm_run struct */
+ run->mmio.is_write = false;
+ run->mmio.phys_addr = fault_addr;
+ run->mmio.len = len;
+
+ /* Try to handle MMIO access in the kernel */
+ if (!kvm_io_bus_read(vcpu, KVM_MMIO_BUS, fault_addr, len, data_buf)) {
+ /* Successfully handled MMIO access in the kernel so resume */
+ memcpy(run->mmio.data, data_buf, len);
+ vcpu->stat.mmio_exit_kernel++;
+ kvm_riscv_vcpu_mmio_return(vcpu, run);
+ return 1;
+ }
+
+ /* Exit to userspace for MMIO emulation */
+ vcpu->stat.mmio_exit_user++;
+ run->exit_reason = KVM_EXIT_MMIO;
+
+ return 0;
+}
+
+/**
+ * kvm_riscv_vcpu_mmio_store -- Emulate MMIO store instruction
+ *
+ * @vcpu: The VCPU pointer
+ * @run: The VCPU run struct containing the mmio data
+ * @fault_addr: Guest physical address to store
+ * @htinst: Transformed encoding of the store instruction
+ *
+ * Returns > 0 to continue run-loop
+ * Returns 0 to exit run-loop and handle in user-space.
+ * Returns < 0 to report failure and exit run-loop
+ */
+int kvm_riscv_vcpu_mmio_store(struct kvm_vcpu *vcpu, struct kvm_run *run,
+ unsigned long fault_addr,
+ unsigned long htinst)
+{
+ u8 data8;
+ u16 data16;
+ u32 data32;
+ u64 data64;
+ ulong data;
+ unsigned long insn;
+ int len = 0, insn_len = 0;
+ struct kvm_cpu_trap utrap = { 0 };
+ struct kvm_cpu_context *ct = &vcpu->arch.guest_context;
+
+ /* Determine trapped instruction */
+ if (htinst & 0x1) {
+ /*
+ * Bit[0] == 1 implies trapped instruction value is
+ * transformed instruction or custom instruction.
+ */
+ insn = htinst | INSN_16BIT_MASK;
+ insn_len = (htinst & BIT(1)) ? INSN_LEN(insn) : 2;
+ } else {
+ /*
+ * Bit[0] == 0 implies trapped instruction value is
+ * zero or special value.
+ */
+ insn = kvm_riscv_vcpu_unpriv_read(vcpu, true, ct->sepc,
+ &utrap);
+ if (utrap.scause) {
+ /* Redirect trap if we failed to read instruction */
+ utrap.sepc = ct->sepc;
+ kvm_riscv_vcpu_trap_redirect(vcpu, &utrap);
+ return 1;
+ }
+ insn_len = INSN_LEN(insn);
+ }
+
+ data = GET_RS2(insn, &vcpu->arch.guest_context);
+ data8 = data16 = data32 = data64 = data;
+
+ if ((insn & INSN_MASK_SW) == INSN_MATCH_SW) {
+ len = 4;
+ } else if ((insn & INSN_MASK_SB) == INSN_MATCH_SB) {
+ len = 1;
+#ifdef CONFIG_64BIT
+ } else if ((insn & INSN_MASK_SD) == INSN_MATCH_SD) {
+ len = 8;
+#endif
+ } else if ((insn & INSN_MASK_SH) == INSN_MATCH_SH) {
+ len = 2;
+#ifdef CONFIG_64BIT
+ } else if ((insn & INSN_MASK_C_SD) == INSN_MATCH_C_SD) {
+ len = 8;
+ data64 = GET_RS2S(insn, &vcpu->arch.guest_context);
+ } else if ((insn & INSN_MASK_C_SDSP) == INSN_MATCH_C_SDSP &&
+ ((insn >> SH_RD) & 0x1f)) {
+ len = 8;
+ data64 = GET_RS2C(insn, &vcpu->arch.guest_context);
+#endif
+ } else if ((insn & INSN_MASK_C_SW) == INSN_MATCH_C_SW) {
+ len = 4;
+ data32 = GET_RS2S(insn, &vcpu->arch.guest_context);
+ } else if ((insn & INSN_MASK_C_SWSP) == INSN_MATCH_C_SWSP &&
+ ((insn >> SH_RD) & 0x1f)) {
+ len = 4;
+ data32 = GET_RS2C(insn, &vcpu->arch.guest_context);
+ } else {
+ return -EOPNOTSUPP;
+ }
+
+ /* Fault address should be aligned to length of MMIO */
+ if (fault_addr & (len - 1))
+ return -EIO;
+
+ /* Save instruction decode info */
+ vcpu->arch.mmio_decode.insn = insn;
+ vcpu->arch.mmio_decode.insn_len = insn_len;
+ vcpu->arch.mmio_decode.shift = 0;
+ vcpu->arch.mmio_decode.len = len;
+ vcpu->arch.mmio_decode.return_handled = 0;
+
+ /* Copy data to kvm_run instance */
+ switch (len) {
+ case 1:
+ *((u8 *)run->mmio.data) = data8;
+ break;
+ case 2:
+ *((u16 *)run->mmio.data) = data16;
+ break;
+ case 4:
+ *((u32 *)run->mmio.data) = data32;
+ break;
+ case 8:
+ *((u64 *)run->mmio.data) = data64;
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ /* Update MMIO details in kvm_run struct */
+ run->mmio.is_write = true;
+ run->mmio.phys_addr = fault_addr;
+ run->mmio.len = len;
+
+ /* Try to handle MMIO access in the kernel */
+ if (!kvm_io_bus_write(vcpu, KVM_MMIO_BUS,
+ fault_addr, len, run->mmio.data)) {
+ /* Successfully handled MMIO access in the kernel so resume */
+ vcpu->stat.mmio_exit_kernel++;
+ kvm_riscv_vcpu_mmio_return(vcpu, run);
+ return 1;
+ }
+
+ /* Exit to userspace for MMIO emulation */
+ vcpu->stat.mmio_exit_user++;
+ run->exit_reason = KVM_EXIT_MMIO;
+
+ return 0;
+}
+
+/**
+ * kvm_riscv_vcpu_mmio_return -- Handle MMIO loads after user space emulation
+ * or in-kernel IO emulation
+ *
+ * @vcpu: The VCPU pointer
+ * @run: The VCPU run struct containing the mmio data
+ */
+int kvm_riscv_vcpu_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+ u8 data8;
+ u16 data16;
+ u32 data32;
+ u64 data64;
+ ulong insn;
+ int len, shift;
+
+ if (vcpu->arch.mmio_decode.return_handled)
+ return 0;
+
+ vcpu->arch.mmio_decode.return_handled = 1;
+ insn = vcpu->arch.mmio_decode.insn;
+
+ if (run->mmio.is_write)
+ goto done;
+
+ len = vcpu->arch.mmio_decode.len;
+ shift = vcpu->arch.mmio_decode.shift;
+
+ switch (len) {
+ case 1:
+ data8 = *((u8 *)run->mmio.data);
+ SET_RD(insn, &vcpu->arch.guest_context,
+ (ulong)data8 << shift >> shift);
+ break;
+ case 2:
+ data16 = *((u16 *)run->mmio.data);
+ SET_RD(insn, &vcpu->arch.guest_context,
+ (ulong)data16 << shift >> shift);
+ break;
+ case 4:
+ data32 = *((u32 *)run->mmio.data);
+ SET_RD(insn, &vcpu->arch.guest_context,
+ (ulong)data32 << shift >> shift);
+ break;
+ case 8:
+ data64 = *((u64 *)run->mmio.data);
+ SET_RD(insn, &vcpu->arch.guest_context,
+ (ulong)data64 << shift >> shift);
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+done:
+ /* Move to next instruction */
+ vcpu->arch.guest_context.sepc += vcpu->arch.mmio_decode.insn_len;
+
+ return 0;
+}
diff --git a/arch/riscv/kvm/vcpu_timer.c b/arch/riscv/kvm/vcpu_timer.c
index 5c4c37ff2d48..595043857049 100644
--- a/arch/riscv/kvm/vcpu_timer.c
+++ b/arch/riscv/kvm/vcpu_timer.c
@@ -214,12 +214,10 @@ void kvm_riscv_vcpu_timer_restore(struct kvm_vcpu *vcpu)
#endif
}
-int kvm_riscv_guest_timer_init(struct kvm *kvm)
+void kvm_riscv_guest_timer_init(struct kvm *kvm)
{
struct kvm_guest_timer *gt = &kvm->arch.timer;
riscv_cs_get_mult_shift(&gt->nsec_mult, &gt->nsec_shift);
gt->time_delta = -get_cycles64();
-
- return 0;
}
diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c
index 945a2bf5e3f6..65a964d7e70d 100644
--- a/arch/riscv/kvm/vm.c
+++ b/arch/riscv/kvm/vm.c
@@ -41,7 +41,9 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
return r;
}
- return kvm_riscv_guest_timer_init(kvm);
+ kvm_riscv_guest_timer_init(kvm);
+
+ return 0;
}
void kvm_arch_destroy_vm(struct kvm *kvm)
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-11-25 12:31:15 +0000