Commit 2476b5a1 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Paolo Bonzini
Browse files

KVM: selftests: Test access to XMM fast hypercalls 



Check that #UD is raised if bit 16 is clear in
HYPERV_CPUID_FEATURES.EDX and an 'XMM fast' hypercall is issued.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: default avatarSiddharth Chandrasekaran <sidcha@amazon.de>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210730122625.112848-5-vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 4e62aa96

tools/testing/selftests/kvm/include/x86_64/hyperv.h

+4 −1
Original line number Diff line number Diff line
@@ -117,7 +117,7 @@ 
#define HV_X64_GUEST_DEBUGGING_AVAILABLE		BIT(1)

#define HV_X64_PERF_MONITOR_AVAILABLE			BIT(2)

#define HV_X64_CPU_DYNAMIC_PARTITIONING_AVAILABLE	BIT(3)

#define HV_X64_HYPERCALL_PARAMS_XMM_AVAILABLE		BIT(4)

#define HV_X64_HYPERCALL_XMM_INPUT_AVAILABLE		BIT(4)

#define HV_X64_GUEST_IDLE_STATE_AVAILABLE		BIT(5)

#define HV_FEATURE_FREQUENCY_MSRS_AVAILABLE		BIT(8)

#define HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE		BIT(10)
@@ -182,4 +182,7 @@ 
#define HV_STATUS_INVALID_CONNECTION_ID		18

#define HV_STATUS_INSUFFICIENT_BUFFERS		19



/* hypercall options */

#define HV_HYPERCALL_FAST_BIT		BIT(16)



#endif /* !SELFTEST_KVM_HYPERV_H */

tools/testing/selftests/kvm/x86_64/hyperv_features.c

+38 −3
Original line number Diff line number Diff line
@@ -47,6 +47,7 @@ static void do_wrmsr(u32 idx, u64 val) 
}



static int nr_gp;

static int nr_ud;



static inline u64 hypercall(u64 control, vm_vaddr_t input_address,

			    vm_vaddr_t output_address)
@@ -80,6 +81,12 @@ static void guest_gp_handler(struct ex_regs *regs) 
		regs->rip = (uint64_t)&wrmsr_end;

}



static void guest_ud_handler(struct ex_regs *regs)

{

	nr_ud++;

	regs->rip += 3;

}



struct msr_data {

	uint32_t idx;

	bool available;
@@ -90,6 +97,7 @@ struct msr_data { 
struct hcall_data {

	uint64_t control;

	uint64_t expect;

	bool ud_expected;

};



static void guest_msr(struct msr_data *msr)
@@ -117,13 +125,26 @@ static void guest_msr(struct msr_data *msr) 
static void guest_hcall(vm_vaddr_t pgs_gpa, struct hcall_data *hcall)

{

	int i = 0;

	u64 res, input, output;



	wrmsr(HV_X64_MSR_GUEST_OS_ID, LINUX_OS_ID);

	wrmsr(HV_X64_MSR_HYPERCALL, pgs_gpa);



	while (hcall->control) {

		GUEST_ASSERT(hypercall(hcall->control, pgs_gpa,

				       pgs_gpa + 4096) == hcall->expect);

		nr_ud = 0;

		if (!(hcall->control & HV_HYPERCALL_FAST_BIT)) {

			input = pgs_gpa;

			output = pgs_gpa + 4096;

		} else {

			input = output = 0;

		}



		res = hypercall(hcall->control, input, output);

		if (hcall->ud_expected)

			GUEST_ASSERT(nr_ud == 1);

		else

			GUEST_ASSERT(res == hcall->expect);



		GUEST_SYNC(i++);

	}
@@ -552,8 +573,18 @@ static void guest_test_hcalls_access(struct kvm_vm *vm, struct hcall_data *hcall 
			recomm.ebx = 0xfff;

			hcall->expect = HV_STATUS_SUCCESS;

			break;



		case 17:

			/* XMM fast hypercall */

			hcall->control = HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE | HV_HYPERCALL_FAST_BIT;

			hcall->ud_expected = true;

			break;

		case 18:

			feat.edx |= HV_X64_HYPERCALL_XMM_INPUT_AVAILABLE;

			hcall->ud_expected = false;

			hcall->expect = HV_STATUS_SUCCESS;

			break;



		case 19:

			/* END */

			hcall->control = 0;

			break;
@@ -625,6 +656,10 @@ int main(void) 
	/* Test hypercalls */

	vm = vm_create_default(VCPU_ID, 0, guest_hcall);



	vm_init_descriptor_tables(vm);

	vcpu_init_descriptor_tables(vm, VCPU_ID);

	vm_install_exception_handler(vm, UD_VECTOR, guest_ud_handler);



	/* Hypercall input/output */

	hcall_page = vm_vaddr_alloc_pages(vm, 2);

	memset(addr_gva2hva(vm, hcall_page), 0x0, 2 * getpagesize());