linux-kernel - [PATCH v2 1/4] KVM: selftests: Move the guts of kvm

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Date:   Sat,  4 Feb 2023 02:41:48 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        David Woodhouse <dwmw@...zon.co.uk>
Subject: [PATCH v2 1/4] KVM: selftests: Move the guts of kvm_hypercall() to a
 separate macro

Extract the guts of kvm_hypercall() to a macro so that Xen hypercalls,
which have a different register ABI, can reuse the VMCALL vs. VMMCALL
logic.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 .../selftests/kvm/lib/x86_64/processor.c      | 29 +++++++++++--------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index ae1e573d94ce..ff901cb47ffc 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -1139,21 +1139,26 @@ const struct kvm_cpuid_entry2 *get_cpuid_entry(const struct kvm_cpuid2 *cpuid,
 	return NULL;
 }
 
+#define X86_HYPERCALL(inputs...)					\
+({									\
+	uint64_t r;							\
+									\
+	asm volatile("test %[use_vmmcall], %[use_vmmcall]\n\t"		\
+		     "jnz 1f\n\t"					\
+		     "vmcall\n\t"					\
+		     "jmp 2f\n\t"					\
+		     "1: vmmcall\n\t"					\
+		     "2:"						\
+		     : "=a"(r)						\
+		     : [use_vmmcall] "r" (host_cpu_is_amd), inputs);	\
+									\
+	r;								\
+})
+
 uint64_t kvm_hypercall(uint64_t nr, uint64_t a0, uint64_t a1, uint64_t a2,
 		       uint64_t a3)
 {
-	uint64_t r;
-
-	asm volatile("test %[use_vmmcall], %[use_vmmcall]\n\t"
-		     "jnz 1f\n\t"
-		     "vmcall\n\t"
-		     "jmp 2f\n\t"
-		     "1: vmmcall\n\t"
-		     "2:"
-		     : "=a"(r)
-		     : "a"(nr), "b"(a0), "c"(a1), "d"(a2), "S"(a3),
-		       [use_vmmcall] "r" (host_cpu_is_amd));
-	return r;
+	return X86_HYPERCALL("a"(nr), "b"(a0), "c"(a1), "d"(a2), "S"(a3));
 }
 
 const struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(void)
-- 
2.39.1.519.gcb327c4b5f-goog