diff options
| author | Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> | 2022-04-06 02:29:28 +0300 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2022-04-07 18:27:52 +0300 |
| commit | cfb8ec7a31f234b4519c104f1cc9accbc8b393a9 (patch) | |
| tree | 72f6fdeb556b0a02c7940f86114c607a9eae31cd /arch/x86/include/asm/tdx.h | |
| parent | 32e72854fa5fef6bc72e27c54f31897db9092acb (diff) | |
| download | linux-cfb8ec7a31f234b4519c104f1cc9accbc8b393a9.tar.xz | |
x86/tdx: Wire up KVM hypercalls
KVM hypercalls use the VMCALL or VMMCALL instructions. Although the ABI
is similar, those instructions no longer function for TDX guests.
Make vendor-specific TDVMCALLs instead of VMCALL. This enables TDX
guests to run with KVM acting as the hypervisor.
Among other things, KVM hypercall is used to send IPIs.
Since the KVM driver can be built as a kernel module, export
tdx_kvm_hypercall() to make the symbols visible to kvm.ko.
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20220405232939.73860-20-kirill.shutemov@linux.intel.com
Diffstat (limited to 'arch/x86/include/asm/tdx.h')
| -rw-r--r-- | arch/x86/include/asm/tdx.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h index 9ffd0d2e6e0f..020c81a7c729 100644 --- a/arch/x86/include/asm/tdx.h +++ b/arch/x86/include/asm/tdx.h @@ -76,5 +76,16 @@ static inline bool tdx_early_handle_ve(struct pt_regs *regs) { return false; } #endif /* CONFIG_INTEL_TDX_GUEST */ +#if defined(CONFIG_KVM_GUEST) && defined(CONFIG_INTEL_TDX_GUEST) +long tdx_kvm_hypercall(unsigned int nr, unsigned long p1, unsigned long p2, + unsigned long p3, unsigned long p4); +#else +static inline long tdx_kvm_hypercall(unsigned int nr, unsigned long p1, + unsigned long p2, unsigned long p3, + unsigned long p4) +{ + return -ENODEV; +} +#endif /* CONFIG_INTEL_TDX_GUEST && CONFIG_KVM_GUEST */ #endif /* !__ASSEMBLY__ */ #endif /* _ASM_X86_TDX_H */ |