linux-kernel - [V1 PATCH 3/5] selftests: kvm: x86: Execute vmcall/vmmcall according to CPU type

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Date:   Sat,  3 Sep 2022 01:28:47 +0000
From:   Vishal Annapurve <vannapurve@...gle.com>
To:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Cc:     pbonzini@...hat.com, shuah@...nel.org, bgardon@...gle.com,
        seanjc@...gle.com, oupton@...gle.com, peterx@...hat.com,
        vkuznets@...hat.com, drjones@...hat.com, dmatlack@...gle.com,
        Vishal Annapurve <vannapurve@...gle.com>
Subject: [V1 PATCH 3/5] selftests: kvm: x86: Execute vmcall/vmmcall according
 to CPU type

Modify following APIs for x86 implementation:
1) kvm_arch_main : Query the cpu vendor and cache the value in advance.
2) kvm_arch_post_vm_load: Populate cpu type in the guest memory so that
	guest doesn't need to execute cpuid instruction again.

Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Vishal Annapurve <vannapurve@...gle.com>
---
 .../testing/selftests/kvm/lib/x86_64/processor.c  | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index e22cfc4bf284..ac104653ab43 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -19,6 +19,7 @@
 #define MAX_NR_CPUID_ENTRIES 100
 
 vm_vaddr_t exception_handlers;
+static int is_cpu_amd = -1;
 
 static void regs_dump(FILE *stream, struct kvm_regs *regs, uint8_t indent)
 {
@@ -1019,7 +1020,7 @@ static bool cpu_vendor_string_is(const char *vendor)
 
 bool is_intel_cpu(void)
 {
-	return cpu_vendor_string_is("GenuineIntel");
+	return (is_cpu_amd == 0);
 }
 
 /*
@@ -1027,7 +1028,7 @@ bool is_intel_cpu(void)
  */
 bool is_amd_cpu(void)
 {
-	return cpu_vendor_string_is("AuthenticAMD");
+	return (is_cpu_amd == 1);
 }
 
 void kvm_get_cpu_address_width(unsigned int *pa_bits, unsigned int *va_bits)
@@ -1182,9 +1183,15 @@ uint64_t kvm_hypercall(uint64_t nr, uint64_t a0, uint64_t a1, uint64_t a2,
 {
 	uint64_t r;
 
-	asm volatile("vmcall"
+	if (is_amd_cpu())
+		asm volatile("vmmcall"
 		     : "=a"(r)
 		     : "a"(nr), "b"(a0), "c"(a1), "d"(a2), "S"(a3));
+	else
+		asm volatile("vmcall"
+		     : "=a"(r)
+		     : "a"(nr), "b"(a0), "c"(a1), "d"(a2), "S"(a3));
+
 	return r;
 }
 
@@ -1314,8 +1321,10 @@ bool vm_is_unrestricted_guest(struct kvm_vm *vm)
 
 void kvm_arch_main(void)
 {
+	is_cpu_amd = cpu_vendor_string_is("AuthenticAMD") ? 1 : 0;
 }
 
 void kvm_arch_post_vm_load(struct kvm_vm *vm)
 {
+	sync_global_to_guest(vm, is_cpu_amd);
 }
-- 
2.37.2.789.g6183377224-goog