[PATCH v2 057/144] KVM: selftests: Convert mmu_role_test away from VCPU_ID

Sean Christopherson
2022-06-03T00:54:06Z

Convert mmu_role_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() plus an open
coded assert that KVM_RUN succeeded.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
.../selftests/kvm/x86_64/mmu_role_test.c | 20 ++++++++-----------
1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86_64/mmu_role_test.c b/tools/testing/selftests/kvm/x86_64/mmu_role_test.c
index da2325fcad87..809aa0153cee 100644
--- a/tools/testing/selftests/kvm/x86_64/mmu_role_test.c
+++ b/tools/testing/selftests/kvm/x86_64/mmu_role_test.c
@@ -3,8 +3,6 @@
#include "kvm_util.h"
#include "processor.h"

-#define VCPU_ID 1
-
#define MMIO_GPA 0x100000000ull

static void guest_code(void)
@@ -25,22 +23,21 @@ static void guest_pf_handler(struct ex_regs *regs)
static void mmu_role_test(u32 *cpuid_reg, u32 evil_cpuid_val)
{
u32 good_cpuid_val = *cpuid_reg;
+ struct kvm_vcpu *vcpu;
struct kvm_run *run;
struct kvm_vm *vm;
uint64_t cmd;
- int r;

/* 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;

/* Map 1gb page without a backing memlot. */
__virt_pg_map(vm, MMIO_GPA, MMIO_GPA, X86_PAGE_SIZE_1G);

- r = _vcpu_run(vm, VCPU_ID);
+ vcpu_run(vm, vcpu->id);

/* Guest access to the 1gb page should trigger MMIO. */
- TEST_ASSERT(r == 0, "vcpu_run failed: %d\n", r);
TEST_ASSERT(run->exit_reason == KVM_EXIT_MMIO,
"Unexpected exit reason: %u (%s), expected MMIO exit (1gb page w/o memslot)\n",
run->exit_reason, exit_reason_str(run->exit_reason));
@@ -57,7 +54,7 @@ static void mmu_role_test(u32 *cpuid_reg, u32 evil_cpuid_val)
* returns the struct that contains the entry being modified. Eww.
*/
*cpuid_reg = evil_cpuid_val;
- vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
+ vcpu_set_cpuid(vm, vcpu->id, kvm_get_supported_cpuid());

/*
* Add a dummy memslot to coerce KVM into bumping the MMIO generation.
@@ -70,13 +67,12 @@ static void mmu_role_test(u32 *cpuid_reg, u32 evil_cpuid_val)

/* Set up a #PF handler to eat the RSVD #PF and signal all done! */
vm_init_descriptor_tables(vm);
- vcpu_init_descriptor_tables(vm, VCPU_ID);
+ vcpu_init_descriptor_tables(vm, vcpu->id);
vm_install_exception_handler(vm, PF_VECTOR, guest_pf_handler);

- r = _vcpu_run(vm, VCPU_ID);
- TEST_ASSERT(r == 0, "vcpu_run failed: %d\n", r);
+ vcpu_run(vm, vcpu->id);

- cmd = get_ucall(vm, VCPU_ID, NULL);
+ cmd = get_ucall(vm, vcpu->id, NULL);
TEST_ASSERT(cmd == UCALL_DONE,
"Unexpected guest exit, exit_reason=%s, ucall.cmd = %lu\n",
exit_reason_str(run->exit_reason), cmd);
--
2.36.1.255.ge46751e96f-goog