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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c')
-rw-r--r-- | tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c b/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c new file mode 100644 index 000000000..140e91901 --- /dev/null +++ b/tools/testing/selftests/kvm/x86_64/cr4_cpuid_sync_test.c @@ -0,0 +1,117 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * CR4 and CPUID sync test + * + * Copyright 2018, Red Hat, Inc. and/or its affiliates. + * + * Author: + * Wei Huang <wei@redhat.com> + */ + +#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 X86_FEATURE_XSAVE (1<<26) +#define X86_FEATURE_OSXSAVE (1<<27) +#define VCPU_ID 1 + +static inline bool cr4_cpuid_is_sync(void) +{ + int func, subfunc; + uint32_t eax, ebx, ecx, edx; + uint64_t cr4; + + func = 0x1; + subfunc = 0x0; + __asm__ __volatile__("cpuid" + : "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx) + : "a"(func), "c"(subfunc)); + + cr4 = get_cr4(); + + return (!!(ecx & X86_FEATURE_OSXSAVE)) == (!!(cr4 & X86_CR4_OSXSAVE)); +} + +static void guest_code(void) +{ + uint64_t cr4; + + /* turn on CR4.OSXSAVE */ + cr4 = get_cr4(); + cr4 |= X86_CR4_OSXSAVE; + set_cr4(cr4); + + /* verify CR4.OSXSAVE == CPUID.OSXSAVE */ + GUEST_ASSERT(cr4_cpuid_is_sync()); + + /* notify hypervisor to change CR4 */ + GUEST_SYNC(0); + + /* check again */ + GUEST_ASSERT(cr4_cpuid_is_sync()); + + GUEST_DONE(); +} + +int main(int argc, char *argv[]) +{ + struct kvm_run *run; + struct kvm_vm *vm; + struct kvm_sregs sregs; + struct kvm_cpuid_entry2 *entry; + struct ucall uc; + int rc; + + entry = kvm_get_supported_cpuid_entry(1); + if (!(entry->ecx & X86_FEATURE_XSAVE)) { + print_skip("XSAVE feature not supported"); + return 0; + } + + /* Tell stdout not to buffer its content */ + setbuf(stdout, NULL); + + /* Create VM */ + vm = vm_create_default(VCPU_ID, 0, guest_code); + vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid()); + run = vcpu_state(vm, VCPU_ID); + + while (1) { + rc = _vcpu_run(vm, VCPU_ID); + + TEST_ASSERT(rc == 0, "vcpu_run failed: %d\n", rc); + TEST_ASSERT(run->exit_reason == KVM_EXIT_IO, + "Unexpected exit reason: %u (%s),\n", + run->exit_reason, + exit_reason_str(run->exit_reason)); + + switch (get_ucall(vm, VCPU_ID, &uc)) { + case UCALL_SYNC: + /* emulate hypervisor clearing CR4.OSXSAVE */ + vcpu_sregs_get(vm, VCPU_ID, &sregs); + sregs.cr4 &= ~X86_CR4_OSXSAVE; + vcpu_sregs_set(vm, VCPU_ID, &sregs); + break; + case UCALL_ABORT: + TEST_FAIL("Guest CR4 bit (OSXSAVE) unsynchronized with CPUID bit."); + break; + case UCALL_DONE: + goto done; + default: + TEST_FAIL("Unknown ucall %lu", uc.cmd); + } + } + + kvm_vm_free(vm); + +done: + return 0; +} |