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selftests: kvm: set rax before vmcall
[ Upstream commit281106f938
] kvm_hypercall has to place the hypercall number in rax. Trace events show that kvm_pv_test doesn't work properly: kvm_pv_test-53132: kvm_hypercall: nr 0x0 a0 0x0 a1 0x0 a2 0x0 a3 0x0 kvm_pv_test-53132: kvm_hypercall: nr 0x0 a0 0x0 a1 0x0 a2 0x0 a3 0x0 kvm_pv_test-53132: kvm_hypercall: nr 0x0 a0 0x0 a1 0x0 a2 0x0 a3 0x0 With this change, it starts working as expected: kvm_pv_test-54285: kvm_hypercall: nr 0x5 a0 0x0 a1 0x0 a2 0x0 a3 0x0 kvm_pv_test-54285: kvm_hypercall: nr 0xa a0 0x0 a1 0x0 a2 0x0 a3 0x0 kvm_pv_test-54285: kvm_hypercall: nr 0xb a0 0x0 a1 0x0 a2 0x0 a3 0x0 Signed-off-by: Andrei Vagin <avagin@google.com> Message-Id: <20220722230241.1944655-5-avagin@google.com> Fixes:ac4a4d6de2
("selftests: kvm: test enforcement of paravirtual cpuid features") Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -1326,7 +1326,7 @@ uint64_t kvm_hypercall(uint64_t nr, uint64_t a0, uint64_t a1, uint64_t a2,
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asm volatile("vmcall"
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: "=a"(r)
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: "b"(a0), "c"(a1), "d"(a2), "S"(a3));
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: "a"(nr), "b"(a0), "c"(a1), "d"(a2), "S"(a3));
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return r;
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}
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