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Message-Id: <20230816155850.1216996-6-ltykernel@gmail.com>
Date: Wed, 16 Aug 2023 11:58:46 -0400
From: Tianyu Lan <ltykernel@...il.com>
To: kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com,
bp@...en8.de, dave.hansen@...ux.intel.com, x86@...nel.org,
hpa@...or.com, daniel.lezcano@...aro.org, arnd@...db.de,
michael.h.kelley@...rosoft.com
Cc: Tianyu Lan <tiala@...rosoft.com>, linux-arch@...r.kernel.org,
linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
vkuznets@...hat.com
Subject: [PATCH v6 5/8] x86/hyperv: Use vmmcall to implement Hyper-V hypercall in sev-snp enlightened guest
From: Tianyu Lan <tiala@...rosoft.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@...rosoft.com>
---
arch/x86/include/asm/mshyperv.h | 44 ++++++++++++++++++++++++---------
1 file changed, 33 insertions(+), 11 deletions(-)
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 9f11f0495950..8479626cd7cb 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -59,16 +59,25 @@ static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
u64 hv_status;
#ifdef CONFIG_X86_64
- if (!hv_hypercall_pg)
- return U64_MAX;
+ if (hv_isolation_type_en_snp()) {
+ __asm__ __volatile__("mov %4, %%r8\n"
+ "vmmcall"
+ : "=a" (hv_status), ASM_CALL_CONSTRAINT,
+ "+c" (control), "+d" (input_address)
+ : "r" (output_address)
+ : "cc", "memory", "r8", "r9", "r10", "r11");
+ } else {
+ if (!hv_hypercall_pg)
+ return U64_MAX;
- __asm__ __volatile__("mov %4, %%r8\n"
- CALL_NOSPEC
- : "=a" (hv_status), ASM_CALL_CONSTRAINT,
- "+c" (control), "+d" (input_address)
- : "r" (output_address),
- THUNK_TARGET(hv_hypercall_pg)
- : "cc", "memory", "r8", "r9", "r10", "r11");
+ __asm__ __volatile__("mov %4, %%r8\n"
+ CALL_NOSPEC
+ : "=a" (hv_status), ASM_CALL_CONSTRAINT,
+ "+c" (control), "+d" (input_address)
+ : "r" (output_address),
+ THUNK_TARGET(hv_hypercall_pg)
+ : "cc", "memory", "r8", "r9", "r10", "r11");
+ }
#else
u32 input_address_hi = upper_32_bits(input_address);
u32 input_address_lo = lower_32_bits(input_address);
@@ -102,7 +111,13 @@ static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1)
u64 hv_status;
#ifdef CONFIG_X86_64
- {
+ if (hv_isolation_type_en_snp()) {
+ __asm__ __volatile__(
+ "vmmcall"
+ : "=a" (hv_status), ASM_CALL_CONSTRAINT,
+ "+c" (control), "+d" (input1)
+ :: "cc", "r8", "r9", "r10", "r11");
+ } else {
__asm__ __volatile__(CALL_NOSPEC
: "=a" (hv_status), ASM_CALL_CONSTRAINT,
"+c" (control), "+d" (input1)
@@ -147,7 +162,14 @@ static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2)
u64 hv_status;
#ifdef CONFIG_X86_64
- {
+ if (hv_isolation_type_en_snp()) {
+ __asm__ __volatile__("mov %4, %%r8\n"
+ "vmmcall"
+ : "=a" (hv_status), ASM_CALL_CONSTRAINT,
+ "+c" (control), "+d" (input1)
+ : "r" (input2)
+ : "cc", "r8", "r9", "r10", "r11");
+ } else {
__asm__ __volatile__("mov %4, %%r8\n"
CALL_NOSPEC
: "=a" (hv_status), ASM_CALL_CONSTRAINT,
--
2.25.1
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