[PATCH 052/128] KVM: selftests: Convert state_test away from VCPU_ID

Sean Christopherson
2022-05-04T22:52:45Z

Convert state_test to use vm_create_with_one_vcpu() and
vm_recreate_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==5. 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(), the test expects
KVM_RUN to succeed.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
.../testing/selftests/kvm/x86_64/state_test.c | 29 +++++++++----------
1 file changed, 14 insertions(+), 15 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86_64/state_test.c b/tools/testing/selftests/kvm/x86_64/state_test.c
index 41f7faaef2ac..b7869efad22a 100644
--- a/tools/testing/selftests/kvm/x86_64/state_test.c
+++ b/tools/testing/selftests/kvm/x86_64/state_test.c
@@ -20,7 +20,6 @@
#include "vmx.h"
#include "svm_util.h"

-#define VCPU_ID 5
#define L2_GUEST_STACK_SIZE 256

void svm_l2_guest_code(void)
@@ -157,6 +156,7 @@ int main(int argc, char *argv[])
vm_vaddr_t nested_gva = 0;

struct kvm_regs regs1, regs2;
+ struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
struct kvm_run *run;
struct kvm_x86_state *state;
@@ -164,10 +164,10 @@ int main(int argc, char *argv[])
int stage;

/* 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;

- vcpu_regs_get(vm, VCPU_ID, &regs1);
+ vcpu_regs_get(vm, vcpu->id, &regs1);

if (kvm_check_cap(KVM_CAP_NESTED_STATE)) {
if (nested_svm_supported())
@@ -179,16 +179,16 @@ int main(int argc, char *argv[])
if (!nested_gva)
pr_info("will skip nested state checks\n");

- vcpu_args_set(vm, VCPU_ID, 1, nested_gva);
+ vcpu_args_set(vm, vcpu->id, 1, nested_gva);

for (stage = 1;; stage++) {
- _vcpu_run(vm, VCPU_ID);
+ vcpu_run(vm, vcpu->id);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Stage %d: unexpected exit reason: %u (%s),\n",
stage, 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_ABORT:
TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0],
__FILE__, uc.args[1]);
@@ -206,22 +206,21 @@ int main(int argc, char *argv[])
uc.args[1] == stage, "Stage %d: Unexpected register values vmexit, got %lx",
stage, (ulong)uc.args[1]);

- state = vcpu_save_state(vm, VCPU_ID);
+ state = vcpu_save_state(vm, vcpu->id);
memset(&regs1, 0, sizeof(regs1));
- vcpu_regs_get(vm, VCPU_ID, &regs1);
+ vcpu_regs_get(vm, vcpu->id, &regs1);

kvm_vm_release(vm);

/* Restore state in a new VM. */
- kvm_vm_restart(vm);
- vm_vcpu_add(vm, VCPU_ID);
- vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
- vcpu_load_state(vm, VCPU_ID, state);
- run = vcpu_state(vm, VCPU_ID);
+ vcpu = vm_recreate_with_one_vcpu(vm);
+ vcpu_set_cpuid(vm, vcpu->id, kvm_get_supported_cpuid());
+ vcpu_load_state(vm, vcpu->id, state);
+ run = vcpu->run;
kvm_x86_state_cleanup(state);

memset(&regs2, 0, sizeof(regs2));
- vcpu_regs_get(vm, VCPU_ID, &regs2);
+ vcpu_regs_get(vm, vcpu->id, &regs2);
TEST_ASSERT(!memcmp(&regs1, &regs2, sizeof(regs2)),
"Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
(ulong) regs2.rdi, (ulong) regs2.rsi);
--
2.36.0.464.gb9c8b46e94-goog