From: Tianyu Lan <ltykernel@gmail.com>
To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org,
decui@microsoft.com, tglx@linutronix.de, mingo@redhat.com,
bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org,
hpa@zytor.com, daniel.lezcano@linaro.org, arnd@arndb.de,
michael.h.kelley@microsoft.com
Cc: Tianyu Lan <tiala@microsoft.com>,
linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org,
linux-kernel@vger.kernel.org, vkuznets@redhat.com
Subject: [PATCH V3 5/9] x86/hyperv: Use vmmcall to implement Hyper-V hypercall in sev-snp enlightened guest
Date: Mon, 17 Jul 2023 23:22:59 -0400 [thread overview]
Message-ID: <20230718032304.136888-6-ltykernel@gmail.com> (raw)
In-Reply-To: <20230718032304.136888-1-ltykernel@gmail.com>
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
next prev parent reply other threads:[~2023-07-18 3:23 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-18 3:22 [PATCH V3 0/9] x86/hyperv: Add AMD sev-snp enlightened guest support on hyperv Tianyu Lan
2023-07-18 3:22 ` [PATCH V3 1/9] x86/hyperv: Add sev-snp enlightened guest static key Tianyu Lan
2023-07-26 3:26 ` Michael Kelley (LINUX)
2023-07-18 3:22 ` [PATCH V3 2/9] x86/hyperv: Set Virtual Trust Level in VMBus init message Tianyu Lan
2023-07-26 3:28 ` Michael Kelley (LINUX)
2023-07-18 3:22 ` [PATCH V3 3/9] x86/hyperv: Mark Hyper-V vp assist page unencrypted in SEV-SNP enlightened guest Tianyu Lan
2023-07-18 3:22 ` [PATCH V3 4/9] drivers: hv: Mark percpu hvcall input arg " Tianyu Lan
2023-07-18 3:22 ` Tianyu Lan [this message]
2023-07-26 3:44 ` [PATCH V3 5/9] x86/hyperv: Use vmmcall to implement Hyper-V hypercall in sev-snp " Michael Kelley (LINUX)
2023-07-26 13:47 ` Tianyu Lan
2023-07-26 14:29 ` Michael Kelley (LINUX)
2023-07-28 10:45 ` Tianyu Lan
2023-07-18 3:23 ` [PATCH V3 6/9] clocksource: hyper-v: Mark hyperv tsc page unencrypted " Tianyu Lan
2023-07-18 3:23 ` [PATCH V3 7/9] x86/hyperv: Initialize cpu and memory for SEV-SNP " Tianyu Lan
2023-07-26 4:26 ` Jinank Jain
2023-07-26 14:15 ` Tianyu Lan
2023-07-18 3:23 ` [PATCH V3 8/9] x86/hyperv: Add smp support for SEV-SNP guest Tianyu Lan
2023-07-18 3:23 ` [PATCH V3 9/9] x86/hyperv: Add hyperv-specific handling for VMMCALL under SEV-ES Tianyu Lan
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