tools/testing/selftests/kvm/x86/kvm_pv_test.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/kvm/x86/kvm_pv_test.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/kvm/x86/kvm_pv_test.c
Extension
.c
Size
5230 bytes
Lines
219
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct msr_data {
	u32 idx;
	const char *name;
};

#define TEST_MSR(msr) { .idx = msr, .name = #msr }
#define UCALL_PR_MSR 0xdeadbeef
#define PR_MSR(msr) ucall(UCALL_PR_MSR, 1, msr)

/*
 * KVM paravirtual msrs to test. Expect a #GP if any of these msrs are read or
 * written, as the KVM_CPUID_FEATURES leaf is cleared.
 */
static struct msr_data msrs_to_test[] = {
	TEST_MSR(MSR_KVM_SYSTEM_TIME),
	TEST_MSR(MSR_KVM_SYSTEM_TIME_NEW),
	TEST_MSR(MSR_KVM_WALL_CLOCK),
	TEST_MSR(MSR_KVM_WALL_CLOCK_NEW),
	TEST_MSR(MSR_KVM_ASYNC_PF_EN),
	TEST_MSR(MSR_KVM_STEAL_TIME),
	TEST_MSR(MSR_KVM_PV_EOI_EN),
	TEST_MSR(MSR_KVM_POLL_CONTROL),
	TEST_MSR(MSR_KVM_ASYNC_PF_INT),
	TEST_MSR(MSR_KVM_ASYNC_PF_ACK),
};

static void test_msr(struct msr_data *msr)
{
	u64 ignored;
	u8 vector;

	PR_MSR(msr);

	vector = rdmsr_safe(msr->idx, &ignored);
	GUEST_ASSERT_EQ(vector, GP_VECTOR);

	vector = wrmsr_safe(msr->idx, 0);
	GUEST_ASSERT_EQ(vector, GP_VECTOR);
}

struct hcall_data {
	u64 nr;
	const char *name;
};

#define TEST_HCALL(hc) { .nr = hc, .name = #hc }
#define UCALL_PR_HCALL 0xdeadc0de
#define PR_HCALL(hc) ucall(UCALL_PR_HCALL, 1, hc)

/*
 * KVM hypercalls to test. Expect -KVM_ENOSYS when called, as the corresponding
 * features have been cleared in KVM_CPUID_FEATURES.
 */
static struct hcall_data hcalls_to_test[] = {
	TEST_HCALL(KVM_HC_KICK_CPU),
	TEST_HCALL(KVM_HC_SEND_IPI),
	TEST_HCALL(KVM_HC_SCHED_YIELD),
};

static void test_hcall(struct hcall_data *hc)
{
	u64 r;

	PR_HCALL(hc);
	r = kvm_hypercall(hc->nr, 0, 0, 0, 0);
	GUEST_ASSERT_EQ(r, -KVM_ENOSYS);
}

static void guest_main(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(msrs_to_test); i++) {
		test_msr(&msrs_to_test[i]);
	}

	for (i = 0; i < ARRAY_SIZE(hcalls_to_test); i++) {
		test_hcall(&hcalls_to_test[i]);
	}

	GUEST_DONE();
}

static void pr_msr(struct ucall *uc)
{
	struct msr_data *msr = (struct msr_data *)uc->args[0];

	pr_info("testing msr: %s (%#x)\n", msr->name, msr->idx);
}

Annotation

Implementation Notes