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