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selftests: kvm: add selftest for releasing VM file descriptor while in L2

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This adds a test for the previous bug.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2019-01-31 23:49:21 +01:00
parent d13937116f
commit 65ab26e397
3 changed files with 97 additions and 0 deletions
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1
tools/testing/selftests/kvm/.gitignore vendored
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@ -3,6 +3,7 @@
/x86_64/platform_info_test
/x86_64/set_sregs_test
/x86_64/sync_regs_test
/x86_64/vmx_close_while_nested_test
/x86_64/vmx_tsc_adjust_test
/x86_64/state_test
/dirty_log_test

1
tools/testing/selftests/kvm/Makefile
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@ -16,6 +16,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/cr4_cpuid_sync_test
TEST_GEN_PROGS_x86_64 += x86_64/state_test
TEST_GEN_PROGS_x86_64 += x86_64/evmcs_test
TEST_GEN_PROGS_x86_64 += x86_64/hyperv_cpuid
TEST_GEN_PROGS_x86_64 += x86_64/vmx_close_while_nested_test
TEST_GEN_PROGS_x86_64 += dirty_log_test
TEST_GEN_PROGS_x86_64 += clear_dirty_log_test

95
tools/testing/selftests/kvm/x86_64/vmx_close_while_nested_test.c Normal file
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@ -0,0 +1,95 @@
/*
* vmx_close_while_nested
*
* Copyright (C) 2019, Red Hat, Inc.
*
* This work is licensed under the terms of the GNU GPL, version 2.
*
* Verify that nothing bad happens if a KVM user exits with open
* file descriptors while executing a nested guest.
*/
#include "test_util.h"
#include "kvm_util.h"
#include "processor.h"
#include "vmx.h"
#include <string.h>
#include <sys/ioctl.h>
#include "kselftest.h"
#define VCPU_ID 5
enum {
PORT_L0_EXIT = 0x2000,
};
/* The virtual machine object. */
static struct kvm_vm *vm;
static void l2_guest_code(void)
{
/* Exit to L0 */
asm volatile("inb %%dx, %%al"
: : [port] "d" (PORT_L0_EXIT) : "rax");
}
static void l1_guest_code(struct vmx_pages *vmx_pages)
{
#define L2_GUEST_STACK_SIZE 64
unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
uint32_t control;
uintptr_t save_cr3;
GUEST_ASSERT(prepare_for_vmx_operation(vmx_pages));
GUEST_ASSERT(load_vmcs(vmx_pages));
/* Prepare the VMCS for L2 execution. */
prepare_vmcs(vmx_pages, l2_guest_code,
&l2_guest_stack[L2_GUEST_STACK_SIZE]);
GUEST_ASSERT(!vmlaunch());
GUEST_ASSERT(0);
}
int main(int argc, char *argv[])
{
struct vmx_pages *vmx_pages;
vm_vaddr_t vmx_pages_gva;
struct kvm_cpuid_entry2 *entry = kvm_get_supported_cpuid_entry(1);
if (!(entry->ecx & CPUID_VMX)) {
fprintf(stderr, "nested VMX not enabled, skipping test\n");
exit(KSFT_SKIP);
}
vm = vm_create_default(VCPU_ID, 0, (void *) l1_guest_code);
vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
/* Allocate VMX pages and shared descriptors (vmx_pages). */
vmx_pages = vcpu_alloc_vmx(vm, &vmx_pages_gva);
vcpu_args_set(vm, VCPU_ID, 1, vmx_pages_gva);
for (;;) {
volatile struct kvm_run *run = vcpu_state(vm, VCPU_ID);
struct ucall uc;
vcpu_run(vm, VCPU_ID);
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
"Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
run->exit_reason,
exit_reason_str(run->exit_reason));
if (run->io.port == PORT_L0_EXIT)
break;
switch (get_ucall(vm, VCPU_ID, &uc)) {
case UCALL_ABORT:
TEST_ASSERT(false, "%s", (const char *)uc.args[0]);
/* NOT REACHED */
default:
TEST_ASSERT(false, "Unknown ucall 0x%x.", uc.cmd);
}
}
}