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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018, Red Hat, Inc.
*
* Tests for Enlightened VMCS, including nested guest state.
*/
#define _GNU_SOURCE /* for program_invocation_short_name */
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include "test_util.h"
#include "kvm_util.h"
#include "vmx.h"
#define VCPU_ID 5
#define NMI_VECTOR 2
static int ud_count;
static void guest_ud_handler(struct ex_regs *regs)
{
ud_count++;
regs->rip += 3; /* VMLAUNCH */
}
static void guest_nmi_handler(struct ex_regs *regs)
{
}
void l2_guest_code(void)
{
GUEST_SYNC(7);
GUEST_SYNC(8);
/* Forced exit to L1 upon restore */
GUEST_SYNC(9);
/* Done, exit to L1 and never come back. */
vmcall();
}
void guest_code(struct vmx_pages *vmx_pages)
{
#define L2_GUEST_STACK_SIZE 64
unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
x2apic_enable();
GUEST_SYNC(1);
GUEST_SYNC(2);
enable_vp_assist(vmx_pages->vp_assist_gpa, vmx_pages->vp_assist);
GUEST_ASSERT(vmx_pages->vmcs_gpa);
GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
GUEST_SYNC(3);
GUEST_ASSERT(load_vmcs(vmx_pages));
GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
GUEST_SYNC(4);
GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
prepare_vmcs(vmx_pages, l2_guest_code,
&l2_guest_stack[L2_GUEST_STACK_SIZE]);
GUEST_SYNC(5);
GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
current_evmcs->revision_id = -1u;
GUEST_ASSERT(vmlaunch());
current_evmcs->revision_id = EVMCS_VERSION;
GUEST_SYNC(6);
current_evmcs->pin_based_vm_exec_control |=
PIN_BASED_NMI_EXITING;
GUEST_ASSERT(!vmlaunch());
GUEST_ASSERT(vmptrstz() == vmx_pages->enlightened_vmcs_gpa);
/*
* NMI forces L2->L1 exit, resuming L2 and hope that EVMCS is
* up-to-date (RIP points where it should and not at the beginning
* of l2_guest_code(). GUEST_SYNC(9) checkes that.
*/
GUEST_ASSERT(!vmresume());
GUEST_SYNC(10);
GUEST_ASSERT(vmreadz(VM_EXIT_REASON) == EXIT_REASON_VMCALL);
GUEST_SYNC(11);
/* Try enlightened vmptrld with an incorrect GPA */
evmcs_vmptrld(0xdeadbeef, vmx_pages->enlightened_vmcs);
GUEST_ASSERT(vmlaunch());
GUEST_ASSERT(ud_count == 1);
GUEST_DONE();
}
void inject_nmi(struct kvm_vm *vm)
{
struct kvm_vcpu_events events;
vcpu_events_get(vm, VCPU_ID, &events);
events.nmi.pending = 1;
events.flags |= KVM_VCPUEVENT_VALID_NMI_PENDING;
vcpu_events_set(vm, VCPU_ID, &events);
}
static void save_restore_vm(struct kvm_vm *vm)
{
struct kvm_regs regs1, regs2;
struct kvm_x86_state *state;
state = vcpu_save_state(vm, VCPU_ID);
memset(®s1, 0, sizeof(regs1));
vcpu_regs_get(vm, VCPU_ID, ®s1);
kvm_vm_release(vm);
/* Restore state in a new VM. */
kvm_vm_restart(vm, O_RDWR);
vm_vcpu_add(vm, VCPU_ID);
vcpu_set_hv_cpuid(vm, VCPU_ID);
vcpu_enable_evmcs(vm, VCPU_ID);
vcpu_load_state(vm, VCPU_ID, state);
free(state);
memset(®s2, 0, sizeof(regs2));
vcpu_regs_get(vm, VCPU_ID, ®s2);
TEST_ASSERT(!memcmp(®s1, ®s2, sizeof(regs2)),
"Unexpected register values after vcpu_load_state; rdi: %lx rsi: %lx",
(ulong) regs2.rdi, (ulong) regs2.rsi);
}
int main(int argc, char *argv[])
{
vm_vaddr_t vmx_pages_gva = 0;
struct kvm_vm *vm;
struct kvm_run *run;
struct ucall uc;
int stage;
/* Create VM */
vm = vm_create_default(VCPU_ID, 0, guest_code);
if (!nested_vmx_supported() ||
!kvm_check_cap(KVM_CAP_NESTED_STATE) ||
!kvm_check_cap(KVM_CAP_HYPERV_ENLIGHTENED_VMCS)) {
print_skip("Enlightened VMCS is unsupported");
exit(KSFT_SKIP);
}
vcpu_set_hv_cpuid(vm, VCPU_ID);
vcpu_enable_evmcs(vm, VCPU_ID);
vcpu_alloc_vmx(vm, &vmx_pages_gva);
vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
vm_init_descriptor_tables(vm);
vcpu_init_descriptor_tables(vm, VCPU_ID);
vm_install_exception_handler(vm, UD_VECTOR, guest_ud_handler);
vm_install_exception_handler(vm, NMI_VECTOR, guest_nmi_handler);
pr_info("Running L1 which uses EVMCS to run L2\n");
for (stage = 1;; stage++) {
run = vcpu_state(vm, VCPU_ID);
_vcpu_run(vm, VCPU_ID);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Stage %d: unexpected exit reason: %u (%s),\n",
stage, run->exit_reason,
exit_reason_str(run->exit_reason));
switch (get_ucall(vm, VCPU_ID, &uc)) {
case UCALL_ABORT:
TEST_FAIL("%s at %s:%ld", (const char *)uc.args[0],
__FILE__, uc.args[1]);
/* NOT REACHED */
case UCALL_SYNC:
break;
case UCALL_DONE:
goto done;
default:
TEST_FAIL("Unknown ucall %lu", uc.cmd);
}
/* UCALL_SYNC is handled here. */
TEST_ASSERT(!strcmp((const char *)uc.args[0], "hello") &&
uc.args[1] == stage, "Stage %d: Unexpected register values vmexit, got %lx",
stage, (ulong)uc.args[1]);
save_restore_vm(vm);
/* Force immediate L2->L1 exit before resuming */
if (stage == 8) {
pr_info("Injecting NMI into L1 before L2 had a chance to run after restore\n");
inject_nmi(vm);
}
/*
* Do KVM_GET_NESTED_STATE/KVM_SET_NESTED_STATE for a freshly
* restored VM (before the first KVM_RUN) to check that
* KVM_STATE_NESTED_EVMCS is not lost.
*/
if (stage == 9) {
pr_info("Trying extra KVM_GET_NESTED_STATE/KVM_SET_NESTED_STATE cycle\n");
save_restore_vm(vm);
}
}
done:
kvm_vm_free(vm);
}
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