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KVM: selftests: Test access to XMM fast hypercalls

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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: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Siddharth Chandrasekaran <sidcha@amazon.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210730122625.112848-5-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-07-30 14:26:25 +02:00 committed by Paolo Bonzini
parent 4e62aa96d6
commit 2476b5a1b1
2 changed files with 42 additions and 4 deletions
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5
tools/testing/selftests/kvm/include/x86_64/hyperv.h
View File

@ -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 */

41
tools/testing/selftests/kvm/x86_64/hyperv_features.c
View File

@ -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());