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KVM: selftests: hyperv_svm_test: Introduce L2 TLB flush test

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Enable Hyper-V L2 TLB flush and check that Hyper-V TLB flush hypercalls
from L2 don't exit to L1 unless 'TlbLockCount' is set in the Partition
assist page.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20221101145426.251680-48-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2022-11-01 15:54:25 +01:00 • committed by Paolo Bonzini
parent 4b5d8b222b
commit 9c2e881945
2 changed files with 58 additions and 5 deletions
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4
tools/testing/selftests/kvm/include/x86_64/svm.h
View file

@ -76,6 +76,10 @@ struct hv_vmcb_enlightenments {
*/
#define HV_VMCB_NESTED_ENLIGHTENMENTS (1U << 31)
/* Synthetic VM-Exit */
#define HV_SVM_EXITCODE_ENL 0xf0000000
#define HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH (1)
struct __attribute__ ((__packed__)) vmcb_control_area {
u32 intercept_cr;
u32 intercept_dr;

59
tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c
View file

@ -34,6 +34,8 @@ static inline void rdmsr_from_l2(uint32_t msr)
void l2_guest_code(void)
{
u64 unused;
GUEST_SYNC(3);
/* Exit to L1 */
vmmcall();
@ -47,11 +49,28 @@ void l2_guest_code(void)
GUEST_SYNC(5);
/* L2 TLB flush tests */
hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE |
HV_HYPERCALL_FAST_BIT, 0x0,
HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES |
HV_FLUSH_ALL_PROCESSORS);
rdmsr_from_l2(MSR_FS_BASE);
/*
* Note: hypercall status (RAX) is not preserved correctly by L1 after
* synthetic vmexit, use unchecked version.
*/
__hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE |
HV_HYPERCALL_FAST_BIT, 0x0,
HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES |
HV_FLUSH_ALL_PROCESSORS, &unused);
/* Done, exit to L1 and never come back. */
vmmcall();
}
static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm)
static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm,
struct hyperv_test_pages *hv_pages,
vm_vaddr_t pgs_gpa)
{
unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
struct vmcb *vmcb = svm->vmcb;
@ -59,13 +78,23 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm)
GUEST_SYNC(1);
wrmsr(HV_X64_MSR_GUEST_OS_ID, (u64)0x8100 << 48);
wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID);
wrmsr(HV_X64_MSR_HYPERCALL, pgs_gpa);
enable_vp_assist(hv_pages->vp_assist_gpa, hv_pages->vp_assist);
GUEST_ASSERT(svm->vmcb_gpa);
/* Prepare for L2 execution. */
generic_svm_setup(svm, l2_guest_code,
&l2_guest_stack[L2_GUEST_STACK_SIZE]);
/* L2 TLB flush setup */
hve->partition_assist_page = hv_pages->partition_assist_gpa;
hve->hv_enlightenments_control.nested_flush_hypercall = 1;
hve->hv_vm_id = 1;
hve->hv_vp_id = 1;
current_vp_assist->nested_control.features.directhypercall = 1;
*(u32 *)(hv_pages->partition_assist) = 0;
GUEST_SYNC(2);
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
@ -100,6 +129,20 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm)
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR);
vmcb->save.rip += 2; /* rdmsr */
/*
* L2 TLB flush test. First VMCALL should be handled directly by L0,
* no VMCALL exit expected.
*/
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR);
vmcb->save.rip += 2; /* rdmsr */
/* Enable synthetic vmexit */
*(u32 *)(hv_pages->partition_assist) = 1;
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == HV_SVM_EXITCODE_ENL);
GUEST_ASSERT(vmcb->control.exit_info_1 == HV_SVM_ENL_EXITCODE_TRAP_AFTER_FLUSH);
run_guest(vmcb, svm->vmcb_gpa);
GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL);
GUEST_SYNC(6);
@ -109,8 +152,8 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm)
int main(int argc, char *argv[])
{
vm_vaddr_t nested_gva = 0;
vm_vaddr_t nested_gva = 0, hv_pages_gva = 0;
vm_vaddr_t hcall_page;
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
struct kvm_run *run;
@ -124,7 +167,13 @@ int main(int argc, char *argv[])
vcpu_set_hv_cpuid(vcpu);
run = vcpu->run;
vcpu_alloc_svm(vm, &nested_gva);
vcpu_args_set(vcpu, 1, nested_gva);
vcpu_alloc_hyperv_test_pages(vm, &hv_pages_gva);
hcall_page = vm_vaddr_alloc_pages(vm, 1);
memset(addr_gva2hva(vm, hcall_page), 0x0, getpagesize());
vcpu_args_set(vcpu, 3, nested_gva, hv_pages_gva, addr_gva2gpa(vm, hcall_page));
vcpu_set_msr(vcpu, HV_X64_MSR_VP_INDEX, vcpu->id);
for (stage = 1;; stage++) {
vcpu_run(vcpu);