308 lines
8.6 KiB
C
308 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2018, Red Hat, Inc.
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*
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* Tests for Enlightened VMCS, including nested guest state.
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <linux/bitmap.h>
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#include "test_util.h"
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#include "kvm_util.h"
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#include "hyperv.h"
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#include "vmx.h"
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static int ud_count;
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static void guest_ud_handler(struct ex_regs *regs)
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{
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ud_count++;
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regs->rip += 3; /* VMLAUNCH */
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}
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static void guest_nmi_handler(struct ex_regs *regs)
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{
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}
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static inline void rdmsr_from_l2(uint32_t msr)
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{
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/* Currently, L1 doesn't preserve GPRs during vmexits. */
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__asm__ __volatile__ ("rdmsr" : : "c"(msr) :
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"rax", "rbx", "rdx", "rsi", "rdi", "r8", "r9",
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"r10", "r11", "r12", "r13", "r14", "r15");
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}
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/* Exit to L1 from L2 with RDMSR instruction */
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void l2_guest_code(void)
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{
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u64 unused;
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GUEST_SYNC(7);
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GUEST_SYNC(8);
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/* Forced exit to L1 upon restore */
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GUEST_SYNC(9);
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vmcall();
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/* MSR-Bitmap tests */
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rdmsr_from_l2(MSR_FS_BASE); /* intercepted */
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rdmsr_from_l2(MSR_FS_BASE); /* intercepted */
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rdmsr_from_l2(MSR_GS_BASE); /* not intercepted */
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vmcall();
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rdmsr_from_l2(MSR_GS_BASE); /* intercepted */
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/* L2 TLB flush tests */
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hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE | HV_HYPERCALL_FAST_BIT, 0x0,
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HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES | HV_FLUSH_ALL_PROCESSORS);
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rdmsr_from_l2(MSR_FS_BASE);
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/*
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* Note: hypercall status (RAX) is not preserved correctly by L1 after
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* synthetic vmexit, use unchecked version.
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*/
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__hyperv_hypercall(HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE | HV_HYPERCALL_FAST_BIT, 0x0,
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HV_FLUSH_ALL_VIRTUAL_ADDRESS_SPACES | HV_FLUSH_ALL_PROCESSORS,
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&unused);
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/* Done, exit to L1 and never come back. */
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vmcall();
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}
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void guest_code(struct vmx_pages *vmx_pages, struct hyperv_test_pages *hv_pages,
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vm_vaddr_t hv_hcall_page_gpa)
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{
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#define L2_GUEST_STACK_SIZE 64
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unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
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wrmsr(HV_X64_MSR_GUEST_OS_ID, HYPERV_LINUX_OS_ID);
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wrmsr(HV_X64_MSR_HYPERCALL, hv_hcall_page_gpa);
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x2apic_enable();
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GUEST_SYNC(1);
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GUEST_SYNC(2);
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enable_vp_assist(hv_pages->vp_assist_gpa, hv_pages->vp_assist);
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evmcs_enable();
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GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
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GUEST_SYNC(3);
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GUEST_ASSERT(load_evmcs(hv_pages));
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GUEST_ASSERT(vmptrstz() == hv_pages->enlightened_vmcs_gpa);
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GUEST_SYNC(4);
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GUEST_ASSERT(vmptrstz() == hv_pages->enlightened_vmcs_gpa);
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prepare_vmcs(vmx_pages, l2_guest_code,
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&l2_guest_stack[L2_GUEST_STACK_SIZE]);
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GUEST_SYNC(5);
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GUEST_ASSERT(vmptrstz() == hv_pages->enlightened_vmcs_gpa);
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current_evmcs->revision_id = -1u;
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GUEST_ASSERT(vmlaunch());
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current_evmcs->revision_id = EVMCS_VERSION;
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GUEST_SYNC(6);
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vmwrite(PIN_BASED_VM_EXEC_CONTROL, vmreadz(PIN_BASED_VM_EXEC_CONTROL) |
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PIN_BASED_NMI_EXITING);
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/* L2 TLB flush setup */
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current_evmcs->partition_assist_page = hv_pages->partition_assist_gpa;
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current_evmcs->hv_enlightenments_control.nested_flush_hypercall = 1;
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current_evmcs->hv_vm_id = 1;
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current_evmcs->hv_vp_id = 1;
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current_vp_assist->nested_control.features.directhypercall = 1;
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*(u32 *)(hv_pages->partition_assist) = 0;
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GUEST_ASSERT(!vmlaunch());
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GUEST_ASSERT_EQ(vmreadz(VM_EXIT_REASON), EXIT_REASON_EXCEPTION_NMI);
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GUEST_ASSERT_EQ((vmreadz(VM_EXIT_INTR_INFO) & 0xff), NMI_VECTOR);
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GUEST_ASSERT(vmptrstz() == hv_pages->enlightened_vmcs_gpa);
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/*
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* NMI forces L2->L1 exit, resuming L2 and hope that EVMCS is
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* up-to-date (RIP points where it should and not at the beginning
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* of l2_guest_code(). GUEST_SYNC(9) checkes that.
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*/
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GUEST_ASSERT(!vmresume());
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GUEST_SYNC(10);
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GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
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current_evmcs->guest_rip += 3; /* vmcall */
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/* Intercept RDMSR 0xc0000100 */
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vmwrite(CPU_BASED_VM_EXEC_CONTROL, vmreadz(CPU_BASED_VM_EXEC_CONTROL) |
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CPU_BASED_USE_MSR_BITMAPS);
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__set_bit(MSR_FS_BASE & 0x1fff, vmx_pages->msr + 0x400);
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GUEST_ASSERT(!vmresume());
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GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_MSR_READ);
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current_evmcs->guest_rip += 2; /* rdmsr */
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/* Enable enlightened MSR bitmap */
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current_evmcs->hv_enlightenments_control.msr_bitmap = 1;
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GUEST_ASSERT(!vmresume());
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GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_MSR_READ);
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current_evmcs->guest_rip += 2; /* rdmsr */
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/* Intercept RDMSR 0xc0000101 without telling KVM about it */
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__set_bit(MSR_GS_BASE & 0x1fff, vmx_pages->msr + 0x400);
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/* Make sure HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP is set */
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current_evmcs->hv_clean_fields |= HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP;
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GUEST_ASSERT(!vmresume());
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/* Make sure we don't see EXIT_REASON_MSR_READ here so eMSR bitmap works */
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GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
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current_evmcs->guest_rip += 3; /* vmcall */
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/* Now tell KVM we've changed MSR-Bitmap */
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current_evmcs->hv_clean_fields &= ~HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP;
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GUEST_ASSERT(!vmresume());
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GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_MSR_READ);
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current_evmcs->guest_rip += 2; /* rdmsr */
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/*
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* L2 TLB flush test. First VMCALL should be handled directly by L0,
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* no VMCALL exit expected.
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*/
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GUEST_ASSERT(!vmresume());
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GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_MSR_READ);
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current_evmcs->guest_rip += 2; /* rdmsr */
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/* Enable synthetic vmexit */
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*(u32 *)(hv_pages->partition_assist) = 1;
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GUEST_ASSERT(!vmresume());
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GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == HV_VMX_SYNTHETIC_EXIT_REASON_TRAP_AFTER_FLUSH);
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GUEST_ASSERT(!vmresume());
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GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
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GUEST_SYNC(11);
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/* Try enlightened vmptrld with an incorrect GPA */
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evmcs_vmptrld(0xdeadbeef, hv_pages->enlightened_vmcs);
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GUEST_ASSERT(vmlaunch());
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GUEST_ASSERT(ud_count == 1);
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GUEST_DONE();
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}
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void inject_nmi(struct kvm_vcpu *vcpu)
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{
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struct kvm_vcpu_events events;
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vcpu_events_get(vcpu, &events);
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events.nmi.pending = 1;
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events.flags |= KVM_VCPUEVENT_VALID_NMI_PENDING;
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vcpu_events_set(vcpu, &events);
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}
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static struct kvm_vcpu *save_restore_vm(struct kvm_vm *vm,
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struct kvm_vcpu *vcpu)
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{
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struct kvm_regs regs1, regs2;
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struct kvm_x86_state *state;
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state = vcpu_save_state(vcpu);
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memset(®s1, 0, sizeof(regs1));
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vcpu_regs_get(vcpu, ®s1);
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kvm_vm_release(vm);
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/* Restore state in a new VM. */
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vcpu = vm_recreate_with_one_vcpu(vm);
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vcpu_set_hv_cpuid(vcpu);
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vcpu_enable_evmcs(vcpu);
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vcpu_load_state(vcpu, state);
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kvm_x86_state_cleanup(state);
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memset(®s2, 0, sizeof(regs2));
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vcpu_regs_get(vcpu, ®s2);
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TEST_ASSERT(!memcmp(®s1, ®s2, sizeof(regs2)),
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"Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
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(ulong) regs2.rdi, (ulong) regs2.rsi);
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return vcpu;
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}
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int main(int argc, char *argv[])
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{
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vm_vaddr_t vmx_pages_gva = 0, hv_pages_gva = 0;
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vm_vaddr_t hcall_page;
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struct kvm_vcpu *vcpu;
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struct kvm_vm *vm;
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struct ucall uc;
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int stage;
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TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_VMX));
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TEST_REQUIRE(kvm_has_cap(KVM_CAP_NESTED_STATE));
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TEST_REQUIRE(kvm_has_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS));
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TEST_REQUIRE(kvm_hv_cpu_has(HV_X64_NESTED_DIRECT_FLUSH));
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vm = vm_create_with_one_vcpu(&vcpu, guest_code);
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hcall_page = vm_vaddr_alloc_pages(vm, 1);
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memset(addr_gva2hva(vm, hcall_page), 0x0, getpagesize());
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vcpu_set_hv_cpuid(vcpu);
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vcpu_enable_evmcs(vcpu);
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vcpu_alloc_vmx(vm, &vmx_pages_gva);
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vcpu_alloc_hyperv_test_pages(vm, &hv_pages_gva);
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vcpu_args_set(vcpu, 3, vmx_pages_gva, hv_pages_gva, addr_gva2gpa(vm, hcall_page));
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vcpu_set_msr(vcpu, HV_X64_MSR_VP_INDEX, vcpu->id);
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vm_install_exception_handler(vm, UD_VECTOR, guest_ud_handler);
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vm_install_exception_handler(vm, NMI_VECTOR, guest_nmi_handler);
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pr_info("Running L1 which uses EVMCS to run L2\n");
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for (stage = 1;; stage++) {
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vcpu_run(vcpu);
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TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
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switch (get_ucall(vcpu, &uc)) {
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case UCALL_ABORT:
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REPORT_GUEST_ASSERT(uc);
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/* NOT REACHED */
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case UCALL_SYNC:
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break;
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case UCALL_DONE:
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goto done;
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default:
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TEST_FAIL("Unknown ucall %lu", uc.cmd);
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}
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/* UCALL_SYNC is handled here. */
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TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
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uc.args[1] == stage, "Stage %d: Unexpected register values vmexit, got %lx",
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stage, (ulong)uc.args[1]);
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vcpu = save_restore_vm(vm, vcpu);
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/* Force immediate L2->L1 exit before resuming */
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if (stage == 8) {
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pr_info("Injecting NMI into L1 before L2 had a chance to run after restore\n");
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inject_nmi(vcpu);
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}
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/*
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* Do KVM_GET_NESTED_STATE/KVM_SET_NESTED_STATE for a freshly
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* restored VM (before the first KVM_RUN) to check that
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* KVM_STATE_NESTED_EVMCS is not lost.
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*/
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if (stage == 9) {
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pr_info("Trying extra KVM_GET_NESTED_STATE/KVM_SET_NESTED_STATE cycle\n");
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vcpu = save_restore_vm(vm, vcpu);
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}
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}
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done:
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kvm_vm_free(vm);
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}
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