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// SPDX-License-Identifier: GPL-2.0-only
/*
* aarch32_id_regs - Test for ID register behavior on AArch64-only systems
*
* Copyright (c) 2022 Google LLC.
*
* Test that KVM handles the AArch64 views of the AArch32 ID registers as RAZ
* and WI from userspace.
*/
#include <stdint.h>
#include "kvm_util.h"
#include "processor.h"
#include "test_util.h"
#include <linux/bitfield.h>
#define BAD_ID_REG_VAL 0x1badc0deul
#define GUEST_ASSERT_REG_RAZ(reg) GUEST_ASSERT_EQ(read_sysreg_s(reg), 0)
static void guest_main(void)
{
GUEST_ASSERT_REG_RAZ(SYS_ID_PFR0_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_PFR1_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_DFR0_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_AFR0_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_MMFR0_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_MMFR1_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_MMFR2_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_MMFR3_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR0_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR1_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR2_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR3_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR4_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR5_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_MMFR4_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_ISAR6_EL1);
GUEST_ASSERT_REG_RAZ(SYS_MVFR0_EL1);
GUEST_ASSERT_REG_RAZ(SYS_MVFR1_EL1);
GUEST_ASSERT_REG_RAZ(SYS_MVFR2_EL1);
GUEST_ASSERT_REG_RAZ(sys_reg(3, 0, 0, 3, 3));
GUEST_ASSERT_REG_RAZ(SYS_ID_PFR2_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_DFR1_EL1);
GUEST_ASSERT_REG_RAZ(SYS_ID_MMFR5_EL1);
GUEST_ASSERT_REG_RAZ(sys_reg(3, 0, 0, 3, 7));
GUEST_DONE();
}
static void test_guest_raz(struct kvm_vcpu *vcpu)
{
struct ucall uc;
vcpu_run(vcpu);
switch (get_ucall(vcpu, &uc)) {
case UCALL_ABORT:
REPORT_GUEST_ASSERT(uc);
break;
case UCALL_DONE:
break;
default:
TEST_FAIL("Unexpected ucall: %lu", uc.cmd);
}
}
static uint64_t raz_wi_reg_ids[] = {
KVM_ARM64_SYS_REG(SYS_ID_PFR0_EL1),
KVM_ARM64_SYS_REG(SYS_ID_PFR1_EL1),
KVM_ARM64_SYS_REG(SYS_ID_DFR0_EL1),
KVM_ARM64_SYS_REG(SYS_ID_MMFR0_EL1),
KVM_ARM64_SYS_REG(SYS_ID_MMFR1_EL1),
KVM_ARM64_SYS_REG(SYS_ID_MMFR2_EL1),
KVM_ARM64_SYS_REG(SYS_ID_MMFR3_EL1),
KVM_ARM64_SYS_REG(SYS_ID_ISAR0_EL1),
KVM_ARM64_SYS_REG(SYS_ID_ISAR1_EL1),
KVM_ARM64_SYS_REG(SYS_ID_ISAR2_EL1),
KVM_ARM64_SYS_REG(SYS_ID_ISAR3_EL1),
KVM_ARM64_SYS_REG(SYS_ID_ISAR4_EL1),
KVM_ARM64_SYS_REG(SYS_ID_ISAR5_EL1),
KVM_ARM64_SYS_REG(SYS_ID_MMFR4_EL1),
KVM_ARM64_SYS_REG(SYS_ID_ISAR6_EL1),
KVM_ARM64_SYS_REG(SYS_MVFR0_EL1),
KVM_ARM64_SYS_REG(SYS_MVFR1_EL1),
KVM_ARM64_SYS_REG(SYS_MVFR2_EL1),
KVM_ARM64_SYS_REG(SYS_ID_PFR2_EL1),
KVM_ARM64_SYS_REG(SYS_ID_MMFR5_EL1),
};
static void test_user_raz_wi(struct kvm_vcpu *vcpu)
{
int i;
for (i = 0; i < ARRAY_SIZE(raz_wi_reg_ids); i++) {
uint64_t reg_id = raz_wi_reg_ids[i];
uint64_t val;
vcpu_get_reg(vcpu, reg_id, &val);
ASSERT_EQ(val, 0);
/*
* Expect the ioctl to succeed with no effect on the register
* value.
*/
vcpu_set_reg(vcpu, reg_id, BAD_ID_REG_VAL);
vcpu_get_reg(vcpu, reg_id, &val);
ASSERT_EQ(val, 0);
}
}
static uint64_t raz_invariant_reg_ids[] = {
KVM_ARM64_SYS_REG(SYS_ID_AFR0_EL1),
KVM_ARM64_SYS_REG(sys_reg(3, 0, 0, 3, 3)),
KVM_ARM64_SYS_REG(SYS_ID_DFR1_EL1),
KVM_ARM64_SYS_REG(sys_reg(3, 0, 0, 3, 7)),
};
static void test_user_raz_invariant(struct kvm_vcpu *vcpu)
{
int i, r;
for (i = 0; i < ARRAY_SIZE(raz_invariant_reg_ids); i++) {
uint64_t reg_id = raz_invariant_reg_ids[i];
uint64_t val;
vcpu_get_reg(vcpu, reg_id, &val);
ASSERT_EQ(val, 0);
r = __vcpu_set_reg(vcpu, reg_id, BAD_ID_REG_VAL);
TEST_ASSERT(r < 0 && errno == EINVAL,
"unexpected KVM_SET_ONE_REG error: r=%d, errno=%d", r, errno);
vcpu_get_reg(vcpu, reg_id, &val);
ASSERT_EQ(val, 0);
}
}
static bool vcpu_aarch64_only(struct kvm_vcpu *vcpu)
{
uint64_t val, el0;
vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(SYS_ID_AA64PFR0_EL1), &val);
el0 = FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL0), val);
return el0 == ID_AA64PFR0_ELx_64BIT_ONLY;
}
int main(void)
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
vm = vm_create_with_one_vcpu(&vcpu, guest_main);
TEST_REQUIRE(vcpu_aarch64_only(vcpu));
test_user_raz_wi(vcpu);
test_user_raz_invariant(vcpu);
test_guest_raz(vcpu);
kvm_vm_free(vm);
}
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