249 lines
7.2 KiB
C
249 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Test for x86 KVM_CAP_SYNC_REGS
|
|
*
|
|
* Copyright (C) 2018, Google LLC.
|
|
*
|
|
* Verifies expected behavior of x86 KVM_CAP_SYNC_REGS functionality,
|
|
* including requesting an invalid register set, updates to/from values
|
|
* in kvm_run.s.regs when kvm_valid_regs and kvm_dirty_regs are toggled.
|
|
*/
|
|
|
|
#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 "processor.h"
|
|
|
|
#define VCPU_ID 5
|
|
|
|
#define UCALL_PIO_PORT ((uint16_t)0x1000)
|
|
|
|
struct ucall uc_none = {
|
|
.cmd = UCALL_NONE,
|
|
};
|
|
|
|
/*
|
|
* ucall is embedded here to protect against compiler reshuffling registers
|
|
* before calling a function. In this test we only need to get KVM_EXIT_IO
|
|
* vmexit and preserve RBX, no additional information is needed.
|
|
*/
|
|
void guest_code(void)
|
|
{
|
|
asm volatile("1: in %[port], %%al\n"
|
|
"add $0x1, %%rbx\n"
|
|
"jmp 1b"
|
|
: : [port] "d" (UCALL_PIO_PORT), "D" (&uc_none)
|
|
: "rax", "rbx");
|
|
}
|
|
|
|
static void compare_regs(struct kvm_regs *left, struct kvm_regs *right)
|
|
{
|
|
#define REG_COMPARE(reg) \
|
|
TEST_ASSERT(left->reg == right->reg, \
|
|
"Register " #reg \
|
|
" values did not match: 0x%llx, 0x%llx\n", \
|
|
left->reg, right->reg)
|
|
REG_COMPARE(rax);
|
|
REG_COMPARE(rbx);
|
|
REG_COMPARE(rcx);
|
|
REG_COMPARE(rdx);
|
|
REG_COMPARE(rsi);
|
|
REG_COMPARE(rdi);
|
|
REG_COMPARE(rsp);
|
|
REG_COMPARE(rbp);
|
|
REG_COMPARE(r8);
|
|
REG_COMPARE(r9);
|
|
REG_COMPARE(r10);
|
|
REG_COMPARE(r11);
|
|
REG_COMPARE(r12);
|
|
REG_COMPARE(r13);
|
|
REG_COMPARE(r14);
|
|
REG_COMPARE(r15);
|
|
REG_COMPARE(rip);
|
|
REG_COMPARE(rflags);
|
|
#undef REG_COMPARE
|
|
}
|
|
|
|
static void compare_sregs(struct kvm_sregs *left, struct kvm_sregs *right)
|
|
{
|
|
}
|
|
|
|
static void compare_vcpu_events(struct kvm_vcpu_events *left,
|
|
struct kvm_vcpu_events *right)
|
|
{
|
|
}
|
|
|
|
#define TEST_SYNC_FIELDS (KVM_SYNC_X86_REGS|KVM_SYNC_X86_SREGS|KVM_SYNC_X86_EVENTS)
|
|
#define INVALID_SYNC_FIELD 0x80000000
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
struct kvm_vm *vm;
|
|
struct kvm_run *run;
|
|
struct kvm_regs regs;
|
|
struct kvm_sregs sregs;
|
|
struct kvm_vcpu_events events;
|
|
int rv, cap;
|
|
|
|
/* Tell stdout not to buffer its content */
|
|
setbuf(stdout, NULL);
|
|
|
|
cap = kvm_check_cap(KVM_CAP_SYNC_REGS);
|
|
if ((cap & TEST_SYNC_FIELDS) != TEST_SYNC_FIELDS) {
|
|
print_skip("KVM_CAP_SYNC_REGS not supported");
|
|
exit(KSFT_SKIP);
|
|
}
|
|
if ((cap & INVALID_SYNC_FIELD) != 0) {
|
|
print_skip("The \"invalid\" field is not invalid");
|
|
exit(KSFT_SKIP);
|
|
}
|
|
|
|
/* Create VM */
|
|
vm = vm_create_default(VCPU_ID, 0, guest_code);
|
|
|
|
run = vcpu_state(vm, VCPU_ID);
|
|
|
|
/* Request reading invalid register set from VCPU. */
|
|
run->kvm_valid_regs = INVALID_SYNC_FIELD;
|
|
rv = _vcpu_run(vm, VCPU_ID);
|
|
TEST_ASSERT(rv < 0 && errno == EINVAL,
|
|
"Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
|
|
rv);
|
|
vcpu_state(vm, VCPU_ID)->kvm_valid_regs = 0;
|
|
|
|
run->kvm_valid_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS;
|
|
rv = _vcpu_run(vm, VCPU_ID);
|
|
TEST_ASSERT(rv < 0 && errno == EINVAL,
|
|
"Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
|
|
rv);
|
|
vcpu_state(vm, VCPU_ID)->kvm_valid_regs = 0;
|
|
|
|
/* Request setting invalid register set into VCPU. */
|
|
run->kvm_dirty_regs = INVALID_SYNC_FIELD;
|
|
rv = _vcpu_run(vm, VCPU_ID);
|
|
TEST_ASSERT(rv < 0 && errno == EINVAL,
|
|
"Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
|
|
rv);
|
|
vcpu_state(vm, VCPU_ID)->kvm_dirty_regs = 0;
|
|
|
|
run->kvm_dirty_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS;
|
|
rv = _vcpu_run(vm, VCPU_ID);
|
|
TEST_ASSERT(rv < 0 && errno == EINVAL,
|
|
"Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
|
|
rv);
|
|
vcpu_state(vm, VCPU_ID)->kvm_dirty_regs = 0;
|
|
|
|
/* Request and verify all valid register sets. */
|
|
/* TODO: BUILD TIME CHECK: TEST_ASSERT(KVM_SYNC_X86_NUM_FIELDS != 3); */
|
|
run->kvm_valid_regs = TEST_SYNC_FIELDS;
|
|
rv = _vcpu_run(vm, VCPU_ID);
|
|
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
|
|
"Unexpected exit reason: %u (%s),\n",
|
|
run->exit_reason,
|
|
exit_reason_str(run->exit_reason));
|
|
|
|
vcpu_regs_get(vm, VCPU_ID, ®s);
|
|
compare_regs(®s, &run->s.regs.regs);
|
|
|
|
vcpu_sregs_get(vm, VCPU_ID, &sregs);
|
|
compare_sregs(&sregs, &run->s.regs.sregs);
|
|
|
|
vcpu_events_get(vm, VCPU_ID, &events);
|
|
compare_vcpu_events(&events, &run->s.regs.events);
|
|
|
|
/* Set and verify various register values. */
|
|
run->s.regs.regs.rbx = 0xBAD1DEA;
|
|
run->s.regs.sregs.apic_base = 1 << 11;
|
|
/* TODO run->s.regs.events.XYZ = ABC; */
|
|
|
|
run->kvm_valid_regs = TEST_SYNC_FIELDS;
|
|
run->kvm_dirty_regs = KVM_SYNC_X86_REGS | KVM_SYNC_X86_SREGS;
|
|
rv = _vcpu_run(vm, VCPU_ID);
|
|
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
|
|
"Unexpected exit reason: %u (%s),\n",
|
|
run->exit_reason,
|
|
exit_reason_str(run->exit_reason));
|
|
TEST_ASSERT(run->s.regs.regs.rbx == 0xBAD1DEA + 1,
|
|
"rbx sync regs value incorrect 0x%llx.",
|
|
run->s.regs.regs.rbx);
|
|
TEST_ASSERT(run->s.regs.sregs.apic_base == 1 << 11,
|
|
"apic_base sync regs value incorrect 0x%llx.",
|
|
run->s.regs.sregs.apic_base);
|
|
|
|
vcpu_regs_get(vm, VCPU_ID, ®s);
|
|
compare_regs(®s, &run->s.regs.regs);
|
|
|
|
vcpu_sregs_get(vm, VCPU_ID, &sregs);
|
|
compare_sregs(&sregs, &run->s.regs.sregs);
|
|
|
|
vcpu_events_get(vm, VCPU_ID, &events);
|
|
compare_vcpu_events(&events, &run->s.regs.events);
|
|
|
|
/* Clear kvm_dirty_regs bits, verify new s.regs values are
|
|
* overwritten with existing guest values.
|
|
*/
|
|
run->kvm_valid_regs = TEST_SYNC_FIELDS;
|
|
run->kvm_dirty_regs = 0;
|
|
run->s.regs.regs.rbx = 0xDEADBEEF;
|
|
rv = _vcpu_run(vm, VCPU_ID);
|
|
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
|
|
"Unexpected exit reason: %u (%s),\n",
|
|
run->exit_reason,
|
|
exit_reason_str(run->exit_reason));
|
|
TEST_ASSERT(run->s.regs.regs.rbx != 0xDEADBEEF,
|
|
"rbx sync regs value incorrect 0x%llx.",
|
|
run->s.regs.regs.rbx);
|
|
|
|
/* Clear kvm_valid_regs bits and kvm_dirty_bits.
|
|
* Verify s.regs values are not overwritten with existing guest values
|
|
* and that guest values are not overwritten with kvm_sync_regs values.
|
|
*/
|
|
run->kvm_valid_regs = 0;
|
|
run->kvm_dirty_regs = 0;
|
|
run->s.regs.regs.rbx = 0xAAAA;
|
|
regs.rbx = 0xBAC0;
|
|
vcpu_regs_set(vm, VCPU_ID, ®s);
|
|
rv = _vcpu_run(vm, VCPU_ID);
|
|
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
|
|
"Unexpected exit reason: %u (%s),\n",
|
|
run->exit_reason,
|
|
exit_reason_str(run->exit_reason));
|
|
TEST_ASSERT(run->s.regs.regs.rbx == 0xAAAA,
|
|
"rbx sync regs value incorrect 0x%llx.",
|
|
run->s.regs.regs.rbx);
|
|
vcpu_regs_get(vm, VCPU_ID, ®s);
|
|
TEST_ASSERT(regs.rbx == 0xBAC0 + 1,
|
|
"rbx guest value incorrect 0x%llx.",
|
|
regs.rbx);
|
|
|
|
/* Clear kvm_valid_regs bits. Verify s.regs values are not overwritten
|
|
* with existing guest values but that guest values are overwritten
|
|
* with kvm_sync_regs values.
|
|
*/
|
|
run->kvm_valid_regs = 0;
|
|
run->kvm_dirty_regs = TEST_SYNC_FIELDS;
|
|
run->s.regs.regs.rbx = 0xBBBB;
|
|
rv = _vcpu_run(vm, VCPU_ID);
|
|
TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
|
|
"Unexpected exit reason: %u (%s),\n",
|
|
run->exit_reason,
|
|
exit_reason_str(run->exit_reason));
|
|
TEST_ASSERT(run->s.regs.regs.rbx == 0xBBBB,
|
|
"rbx sync regs value incorrect 0x%llx.",
|
|
run->s.regs.regs.rbx);
|
|
vcpu_regs_get(vm, VCPU_ID, ®s);
|
|
TEST_ASSERT(regs.rbx == 0xBBBB + 1,
|
|
"rbx guest value incorrect 0x%llx.",
|
|
regs.rbx);
|
|
|
|
kvm_vm_free(vm);
|
|
|
|
return 0;
|
|
}
|