diff options
| author | Alexey Makhalov <alexey.makhalov@broadcom.com> | 2024-06-13 12:16:50 -0700 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-06-25 17:15:48 +0200 |
| commit | 57b7b6acb41b51087ceb40c562efe392ec8c9677 (patch) | |
| tree | 1f4af0e9e00d65778597636ea5038e3f54f0e49a /arch/x86/kernel | |
| parent | 9dfb18031f0df2378b3d33a13fc485ef89caa285 (diff) | |
x86/vmware: Add TDX hypercall support
VMware hypercalls use I/O port, VMCALL or VMMCALL instructions. Add a call to
__tdx_hypercall() in order to support TDX guests.
No change in high bandwidth hypercalls, as only low bandwidth ones are supported
for TDX guests.
[ bp: Massage, clear on-stack struct tdx_module_args variable. ]
Co-developed-by: Tim Merrifield <tim.merrifield@broadcom.com>
Signed-off-by: Tim Merrifield <tim.merrifield@broadcom.com>
Signed-off-by: Alexey Makhalov <alexey.makhalov@broadcom.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240613191650.9913-9-alexey.makhalov@broadcom.com
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/cpu/vmware.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c index fc1b3f688d4f..00189cdeb775 100644 --- a/arch/x86/kernel/cpu/vmware.c +++ b/arch/x86/kernel/cpu/vmware.c @@ -489,6 +489,58 @@ static bool __init vmware_legacy_x2apic_available(void) (eax & GETVCPU_INFO_LEGACY_X2APIC); } +#ifdef CONFIG_INTEL_TDX_GUEST +/* + * TDCALL[TDG.VP.VMCALL] uses %rax (arg0) and %rcx (arg2). Therefore, + * we remap those registers to %r12 and %r13, respectively. + */ +unsigned long vmware_tdx_hypercall(unsigned long cmd, + unsigned long in1, unsigned long in3, + unsigned long in4, unsigned long in5, + u32 *out1, u32 *out2, u32 *out3, + u32 *out4, u32 *out5) +{ + struct tdx_module_args args = {}; + + if (!hypervisor_is_type(X86_HYPER_VMWARE)) { + pr_warn_once("Incorrect usage\n"); + return ULONG_MAX; + } + + if (cmd & ~VMWARE_CMD_MASK) { + pr_warn_once("Out of range command %lx\n", cmd); + return ULONG_MAX; + } + + args.rbx = in1; + args.rdx = in3; + args.rsi = in4; + args.rdi = in5; + args.r10 = VMWARE_TDX_VENDOR_LEAF; + args.r11 = VMWARE_TDX_HCALL_FUNC; + args.r12 = VMWARE_HYPERVISOR_MAGIC; + args.r13 = cmd; + /* CPL */ + args.r15 = 0; + + __tdx_hypercall(&args); + + if (out1) + *out1 = args.rbx; + if (out2) + *out2 = args.r13; + if (out3) + *out3 = args.rdx; + if (out4) + *out4 = args.rsi; + if (out5) + *out5 = args.rdi; + + return args.r12; +} +EXPORT_SYMBOL_GPL(vmware_tdx_hypercall); +#endif + #ifdef CONFIG_AMD_MEM_ENCRYPT static void vmware_sev_es_hcall_prepare(struct ghcb *ghcb, struct pt_regs *regs) |