diff options
Diffstat (limited to 'tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c')
| -rw-r--r-- | tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c | 103 |
1 files changed, 71 insertions, 32 deletions
diff --git a/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c b/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c index a380ad7bb9b3..68a7d354ea07 100644 --- a/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c +++ b/tools/testing/selftests/kvm/x86_64/hyperv_svm_test.c @@ -23,59 +23,78 @@ #define L2_GUEST_STACK_SIZE 256 -struct hv_enlightenments { - struct __packed hv_enlightenments_control { - u32 nested_flush_hypercall:1; - u32 msr_bitmap:1; - u32 enlightened_npt_tlb: 1; - u32 reserved:29; - } __packed hv_enlightenments_control; - u32 hv_vp_id; - u64 hv_vm_id; - u64 partition_assist_page; - u64 reserved; -} __packed; - -/* - * Hyper-V uses the software reserved clean bit in VMCB - */ -#define VMCB_HV_NESTED_ENLIGHTENMENTS (1U << 31) +/* Exit to L1 from L2 with RDMSR instruction */ +static inline void rdmsr_from_l2(uint32_t msr) +{ + /* Currently, L1 doesn't preserve GPRs during vmexits. */ + __asm__ __volatile__ ("rdmsr" : : "c"(msr) : + "rax", "rbx", "rdx", "rsi", "rdi", "r8", "r9", + "r10", "r11", "r12", "r13", "r14", "r15"); +} void l2_guest_code(void) { + u64 unused; + GUEST_SYNC(3); /* Exit to L1 */ vmmcall(); /* MSR-Bitmap tests */ - rdmsr(MSR_FS_BASE); /* intercepted */ - rdmsr(MSR_FS_BASE); /* intercepted */ - rdmsr(MSR_GS_BASE); /* not intercepted */ + rdmsr_from_l2(MSR_FS_BASE); /* intercepted */ + rdmsr_from_l2(MSR_FS_BASE); /* intercepted */ + rdmsr_from_l2(MSR_GS_BASE); /* not intercepted */ vmmcall(); - rdmsr(MSR_GS_BASE); /* intercepted */ + rdmsr_from_l2(MSR_GS_BASE); /* intercepted */ 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; - struct hv_enlightenments *hve = - (struct hv_enlightenments *)vmcb->control.reserved_sw; + struct hv_vmcb_enlightenments *hve = &vmcb->control.hv_enlightenments; 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); @@ -84,7 +103,7 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm) /* Intercept RDMSR 0xc0000100 */ vmcb->control.intercept |= 1ULL << INTERCEPT_MSR_PROT; - set_bit(2 * (MSR_FS_BASE & 0x1fff), svm->msr + 0x800); + __set_bit(2 * (MSR_FS_BASE & 0x1fff), svm->msr + 0x800); run_guest(vmcb, svm->vmcb_gpa); GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_MSR); vmcb->save.rip += 2; /* rdmsr */ @@ -96,20 +115,34 @@ static void __attribute__((__flatten__)) guest_code(struct svm_test_data *svm) vmcb->save.rip += 2; /* rdmsr */ /* Intercept RDMSR 0xc0000101 without telling KVM about it */ - set_bit(2 * (MSR_GS_BASE & 0x1fff), svm->msr + 0x800); + __set_bit(2 * (MSR_GS_BASE & 0x1fff), svm->msr + 0x800); /* Make sure HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP is set */ - vmcb->control.clean |= VMCB_HV_NESTED_ENLIGHTENMENTS; + vmcb->control.clean |= HV_VMCB_NESTED_ENLIGHTENMENTS; run_guest(vmcb, svm->vmcb_gpa); /* Make sure we don't see SVM_EXIT_MSR here so eMSR bitmap works */ GUEST_ASSERT(vmcb->control.exit_code == SVM_EXIT_VMMCALL); vmcb->save.rip += 3; /* vmcall */ /* Now tell KVM we've changed MSR-Bitmap */ - vmcb->control.clean &= ~VMCB_HV_NESTED_ENLIGHTENMENTS; + vmcb->control.clean &= ~HV_VMCB_NESTED_ENLIGHTENMENTS; run_guest(vmcb, svm->vmcb_gpa); 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); @@ -119,8 +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; @@ -134,7 +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); |