linux-kernel - [PATCH 076/128] KVM: selftests: Convert cr4_cpuid_sync_test away from VCPU

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Date:   Wed,  4 May 2022 22:48:22 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Andrew Jones <drjones@...hat.com>,
        David Matlack <dmatlack@...gle.com>,
        Ben Gardon <bgardon@...gle.com>,
        Oliver Upton <oupton@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: [PATCH 076/128] KVM: selftests: Convert cr4_cpuid_sync_test away from VCPU_ID

Convert cr4_cpuid_sync_test to use vm_create_with_one_vcpu() and pass
around a 'struct kvm_vcpu' object instead of using a global VCPU_ID.  Note,
this is a "functional" change in the sense that the test now creates a vCPU
with vcpu_id==0 instead of vcpu_id==1.  The non-zero VCPU_ID was 100%
arbitrary and added little to no validation coverage.  If testing non-zero
vCPU IDs is desirable for generic tests, that can be done in the future by
tweaking the VM creation helpers.

Opportunistically use vcpu_run() instead of _vcpu_run() with an open
coded assert that KVM_RUN succeeded.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 .../selftests/kvm/x86_64/cr4_cpuid_sync_test.c  | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c b/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c
index 6f6fd189dda3..d5615cd0b81b 100644
--- a/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c
+++ b/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c
@@ -21,7 +21,6 @@
 
 #define X86_FEATURE_XSAVE	(1<<26)
 #define X86_FEATURE_OSXSAVE	(1<<27)
-#define VCPU_ID			1
 
 static inline bool cr4_cpuid_is_sync(void)
 {
@@ -63,12 +62,12 @@ static void guest_code(void)
 
 int main(int argc, char *argv[])
 {
+	struct kvm_vcpu *vcpu;
 	struct kvm_run *run;
 	struct kvm_vm *vm;
 	struct kvm_sregs sregs;
 	struct kvm_cpuid_entry2 *entry;
 	struct ucall uc;
-	int rc;
 
 	entry = kvm_get_supported_cpuid_entry(1);
 	if (!(entry->ecx & X86_FEATURE_XSAVE)) {
@@ -79,25 +78,23 @@ int main(int argc, char *argv[])
 	/* Tell stdout not to buffer its content */
 	setbuf(stdout, NULL);
 
-	/* Create VM */
-	vm = vm_create_default(VCPU_ID, 0, guest_code);
-	run = vcpu_state(vm, VCPU_ID);
+	vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+	run = vcpu->run;
 
 	while (1) {
-		rc = _vcpu_run(vm, VCPU_ID);
+		vcpu_run(vm, vcpu->id);
 
-		TEST_ASSERT(rc == 0, "vcpu_run failed: %d\n", rc);
 		TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
 			    "Unexpected exit reason: %u (%s),\n",
 			    run->exit_reason,
 			    exit_reason_str(run->exit_reason));
 
-		switch (get_ucall(vm, VCPU_ID, &uc)) {
+		switch (get_ucall(vm, vcpu->id, &uc)) {
 		case UCALL_SYNC:
 			/* emulate hypervisor clearing CR4.OSXSAVE */
-			vcpu_sregs_get(vm, VCPU_ID, &sregs);
+			vcpu_sregs_get(vm, vcpu->id, &sregs);
 			sregs.cr4 &= ~X86_CR4_OSXSAVE;
-			vcpu_sregs_set(vm, VCPU_ID, &sregs);
+			vcpu_sregs_set(vm, vcpu->id, &sregs);
 			break;
 		case UCALL_ABORT:
 			TEST_FAIL("Guest CR4 bit (OSXSAVE) unsynchronized with CPUID bit.");
-- 
2.36.0.464.gb9c8b46e94-goog