[PATCH v2 086/144] KVM: selftests: Convert userspace_io_test away from VCPU_ID

Sean Christopherson
2022-06-03T00:56:17Z

Convert userspace_io_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@google.com>
---
.../selftests/kvm/x86_64/userspace_io_test.c | 18 +++++++-----------
1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86_64/userspace_io_test.c b/tools/testing/selftests/kvm/x86_64/userspace_io_test.c
index e4bef2e05686..0ba774ed6476 100644
--- a/tools/testing/selftests/kvm/x86_64/userspace_io_test.c
+++ b/tools/testing/selftests/kvm/x86_64/userspace_io_test.c
@@ -10,8 +10,6 @@
#include "kvm_util.h"
#include "processor.h"

-#define VCPU_ID 1
-
static void guest_ins_port80(uint8_t *buffer, unsigned int count)
{
unsigned long end;
@@ -52,31 +50,29 @@ static void guest_code(void)

int main(int argc, char *argv[])
{
+ struct kvm_vcpu *vcpu;
struct kvm_regs regs;
struct kvm_run *run;
struct kvm_vm *vm;
struct ucall uc;
- int rc;

/* 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;

memset(&regs, 0, sizeof(regs));

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));

- if (get_ucall(vm, VCPU_ID, &uc))
+ if (get_ucall(vm, vcpu->id, &uc))
break;

TEST_ASSERT(run->io.port == 0x80,
@@ -89,13 +85,13 @@ int main(int argc, char *argv[])
* scope from a testing perspective as it's not ABI in any way,
* i.e. it really is abusing internal KVM knowledge.
*/
- vcpu_regs_get(vm, VCPU_ID, &regs);
+ vcpu_regs_get(vm, vcpu->id, &regs);
if (regs.rcx == 2)
regs.rcx = 1;
if (regs.rcx == 3)
regs.rcx = 8192;
memset((void *)run + run->io.data_offset, 0xaa, 4096);
- vcpu_regs_set(vm, VCPU_ID, &regs);
+ vcpu_regs_set(vm, vcpu->id, &regs);
}

switch (uc.cmd) {
--
2.36.1.255.ge46751e96f-goog