[PATCH 072/128] KVM: selftests: Convert emulator_error_test away from VCPU_ID

From: Sean Christopherson
Date: Wed May 04 2022 - 19:01:10 EST

Convert emulator_error_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==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() with an open
coded assert that KVM_RUN succeeded.

Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
.../kvm/x86_64/emulator_error_test.c | 65 ++++++++-----------
1 file changed, 28 insertions(+), 37 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86_64/emulator_error_test.c b/tools/testing/selftests/kvm/x86_64/emulator_error_test.c
index aeb3850f81bd..6a2fe7a9f4a6 100644
--- a/tools/testing/selftests/kvm/x86_64/emulator_error_test.c
+++ b/tools/testing/selftests/kvm/x86_64/emulator_error_test.c
@@ -11,7 +11,6 @@
#include "kvm_util.h"
#include "vmx.h"

-#define VCPU_ID 1
#define MAXPHYADDR 36

#define MEM_REGION_GVA 0x0000123456789000
@@ -27,14 +26,6 @@ static void guest_code(void)
GUEST_DONE();
}

-static void run_guest(struct kvm_vm *vm)
-{
- int rc;
-
- rc = _vcpu_run(vm, VCPU_ID);
- TEST_ASSERT(rc == 0, "vcpu_run failed: %d\n", rc);
-}
-
/*
* Accessors to get R/M, REG, and Mod bits described in the SDM vol 2,
* figure 2-2 "Table Interpretation of ModR/M Byte (C8H)".
@@ -56,9 +47,9 @@ static bool is_flds(uint8_t *insn_bytes, uint8_t insn_size)
GET_RM(insn_bytes[1]) != 0x5;
}

-static void process_exit_on_emulation_error(struct kvm_vm *vm)
+static void process_exit_on_emulation_error(struct kvm_vcpu *vcpu)
{
- struct kvm_run *run = vcpu_state(vm, VCPU_ID);
+ struct kvm_run *run = vcpu->run;
struct kvm_regs regs;
uint8_t *insn_bytes;
uint8_t insn_size;
@@ -92,50 +83,49 @@ static void process_exit_on_emulation_error(struct kvm_vm *vm)
* contained an flds instruction that is 2-bytes in
* length (ie: no prefix, no SIB, no displacement).
*/
- vcpu_regs_get(vm, VCPU_ID, &regs);
+ vcpu_regs_get(vcpu->vm, vcpu->id, &regs);
regs.rip += 2;
- vcpu_regs_set(vm, VCPU_ID, &regs);
+ vcpu_regs_set(vcpu->vm, vcpu->id, &regs);
}
}
}

-static void do_guest_assert(struct kvm_vm *vm, struct ucall *uc)
+static void do_guest_assert(struct ucall *uc)
{
TEST_FAIL("%s at %s:%ld", (const char *)uc->args[0], __FILE__,
uc->args[1]);
}

-static void check_for_guest_assert(struct kvm_vm *vm)
+static void check_for_guest_assert(struct kvm_vcpu *vcpu)
{
- struct kvm_run *run = vcpu_state(vm, VCPU_ID);
struct ucall uc;

- if (run->exit_reason == KVM_EXIT_IO &&
- get_ucall(vm, VCPU_ID, &uc) == UCALL_ABORT) {
- do_guest_assert(vm, &uc);
+ if (vcpu->run->exit_reason == KVM_EXIT_IO &&
+ get_ucall(vcpu->vm, vcpu->id, &uc) == UCALL_ABORT) {
+ do_guest_assert(&uc);
}
}

-static void process_ucall_done(struct kvm_vm *vm)
+static void process_ucall_done(struct kvm_vcpu *vcpu)
{
- struct kvm_run *run = vcpu_state(vm, VCPU_ID);
+ struct kvm_run *run = vcpu->run;
struct ucall uc;

- check_for_guest_assert(vm);
+ check_for_guest_assert(vcpu);

TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Unexpected exit reason: %u (%s)",
run->exit_reason,
exit_reason_str(run->exit_reason));

- TEST_ASSERT(get_ucall(vm, VCPU_ID, &uc) == UCALL_DONE,
+ TEST_ASSERT(get_ucall(vcpu->vm, vcpu->id, &uc) == UCALL_DONE,
"Unexpected ucall command: %lu, expected UCALL_DONE (%d)",
uc.cmd, UCALL_DONE);
}

-static uint64_t process_ucall(struct kvm_vm *vm)
+static uint64_t process_ucall(struct kvm_vcpu *vcpu)
{
- struct kvm_run *run = vcpu_state(vm, VCPU_ID);
+ struct kvm_run *run = vcpu->run;
struct ucall uc;

TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
@@ -143,14 +133,14 @@ static uint64_t process_ucall(struct kvm_vm *vm)
run->exit_reason,
exit_reason_str(run->exit_reason));

- switch (get_ucall(vm, VCPU_ID, &uc)) {
+ switch (get_ucall(vcpu->vm, vcpu->id, &uc)) {
case UCALL_SYNC:
break;
case UCALL_ABORT:
- do_guest_assert(vm, &uc);
+ do_guest_assert(&uc);
break;
case UCALL_DONE:
- process_ucall_done(vm);
+ process_ucall_done(vcpu);
break;
default:
TEST_ASSERT(false, "Unexpected ucall");
@@ -167,6 +157,7 @@ int main(int argc, char *argv[])
};
struct kvm_cpuid_entry2 *entry;
struct kvm_cpuid2 *cpuid;
+ struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
uint64_t gpa, pte;
uint64_t *hva;
@@ -175,20 +166,20 @@ int main(int argc, char *argv[])
/* Tell stdout not to buffer its content */
setbuf(stdout, NULL);

- vm = vm_create_default(VCPU_ID, 0, guest_code);
-
if (!kvm_check_cap(KVM_CAP_SMALLER_MAXPHYADDR)) {
printf("module parameter 'allow_smaller_maxphyaddr' is not set. Skipping test.\n");
return 0;
}

+ vm = vm_create_with_one_vcpu(&vcpu, guest_code);
+
cpuid = kvm_get_supported_cpuid();

entry = kvm_get_supported_cpuid_index(0x80000008, 0);
entry->eax = (entry->eax & 0xffffff00) | MAXPHYADDR;
set_cpuid(cpuid, entry);

- vcpu_set_cpuid(vm, VCPU_ID, cpuid);
+ vcpu_set_cpuid(vm, vcpu->id, cpuid);

rc = kvm_check_cap(KVM_CAP_EXIT_ON_EMULATION_FAILURE);
TEST_ASSERT(rc, "KVM_CAP_EXIT_ON_EMULATION_FAILURE is unavailable");
@@ -203,14 +194,14 @@ int main(int argc, char *argv[])
virt_map(vm, MEM_REGION_GVA, MEM_REGION_GPA, 1);
hva = addr_gpa2hva(vm, MEM_REGION_GPA);
memset(hva, 0, PAGE_SIZE);
- pte = vm_get_page_table_entry(vm, VCPU_ID, MEM_REGION_GVA);
- vm_set_page_table_entry(vm, VCPU_ID, MEM_REGION_GVA, pte | (1ull << 36));
+ pte = vm_get_page_table_entry(vm, vcpu->id, MEM_REGION_GVA);
+ vm_set_page_table_entry(vm, vcpu->id, MEM_REGION_GVA, pte | (1ull << 36));

- run_guest(vm);
- process_exit_on_emulation_error(vm);
- run_guest(vm);
+ vcpu_run(vm, vcpu->id);
+ process_exit_on_emulation_error(vcpu);
+ vcpu_run(vm, vcpu->id);

- TEST_ASSERT(process_ucall(vm) == UCALL_DONE, "Expected UCALL_DONE");
+ TEST_ASSERT(process_ucall(vcpu) == UCALL_DONE, "Expected UCALL_DONE");

kvm_vm_free(vm);

--
2.36.0.464.gb9c8b46e94-goog