Messages in this thread Patch in this message | | | From | Tianyu Lan <> | Subject | [PATCH V4 5/9] x86/hyperv: Use vmmcall to implement Hyper-V hypercall in sev-snp enlightened guest | Date | Fri, 4 Aug 2023 11:22:49 -0400 |
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From: Tianyu Lan <tiala@microsoft.com>
In sev-snp enlightened guest, Hyper-V hypercall needs to use vmmcall to trigger vmexit and notify hypervisor to handle hypercall request.
Signed-off-by: Tianyu Lan <tiala@microsoft.com> --- arch/x86/include/asm/mshyperv.h | 27 ++++++++++++++------------- 1 file changed, 14 insertions(+), 13 deletions(-)
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 2fa38e9f6207..025eda129d99 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -64,12 +64,12 @@ static inline u64 hv_do_hypercall(u64 control, void *input, void *output) if (!hv_hypercall_pg) return U64_MAX; - __asm__ __volatile__("mov %4, %%r8\n" - CALL_NOSPEC + __asm__ __volatile__("mov %[output], %%r8\n" + ALTERNATIVE("vmmcall", CALL_NOSPEC, X86_FEATURE_SEV_ES) : "=a" (hv_status), ASM_CALL_CONSTRAINT, - "+c" (control), "+d" (input_address) - : "r" (output_address), - THUNK_TARGET(hv_hypercall_pg) + "+c" (control), "+d" (input_address) + : [output] "r" (output_address), + THUNK_TARGET(hv_hypercall_pg) : "cc", "memory", "r8", "r9", "r10", "r11"); #else u32 input_address_hi = upper_32_bits(input_address); @@ -105,7 +105,8 @@ static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1) #ifdef CONFIG_X86_64 { - __asm__ __volatile__(CALL_NOSPEC + __asm__ __volatile__("mov %[thunk_target], %%r8\n" + ALTERNATIVE("vmmcall", CALL_NOSPEC, X86_FEATURE_SEV_ES) : "=a" (hv_status), ASM_CALL_CONSTRAINT, "+c" (control), "+d" (input1) : THUNK_TARGET(hv_hypercall_pg) @@ -150,13 +151,13 @@ static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2) #ifdef CONFIG_X86_64 { - __asm__ __volatile__("mov %4, %%r8\n" - CALL_NOSPEC - : "=a" (hv_status), ASM_CALL_CONSTRAINT, - "+c" (control), "+d" (input1) - : "r" (input2), - THUNK_TARGET(hv_hypercall_pg) - : "cc", "r8", "r9", "r10", "r11"); + __asm__ __volatile__("mov %[output], %%r8\n" + ALTERNATIVE("vmmcall", CALL_NOSPEC, X86_FEATURE_SEV_ES) + : "=a" (hv_status), ASM_CALL_CONSTRAINT, + "+c" (control), "+d" (input1) + : [output] "r" (input2), + THUNK_TARGET(hv_hypercall_pg) + : "cc", "r8", "r9", "r10", "r11"); } #else { -- 2.25.1
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