mirror of
https://github.com/raspberrypi/linux.git
synced 2025-12-19 08:14:25 +00:00
67730e6c53
Use the kernel's canonical $(ARCH) paths instead of the raw target triple for KVM selftests directories. KVM selftests are quite nearly the only place in the entire kernel that using the target triple for directories, tools/testing/selftests/drivers/s390x being the lone holdout. Using the kernel's preferred nomenclature eliminates the minor, but annoying, friction of having to translate to KVM's selftests directories, e.g. for pattern matching, opening files, running selftests, etc. Opportunsitically delete file comments that reference the full path of the file, as they are obviously prone to becoming stale, and serve no known purpose. Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com> Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Acked-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20241128005547.4077116-16-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
// 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 MAGIC_HYPERCALL_PORT 0x80
|
|
|
|
static void guest_code(void)
|
|
{
|
|
u32 regs[4] = {
|
|
[KVM_CPUID_EAX] = X86_FEATURE_OSXSAVE.function,
|
|
[KVM_CPUID_ECX] = X86_FEATURE_OSXSAVE.index,
|
|
};
|
|
|
|
/* CR4.OSXSAVE should be enabled by default (for selftests vCPUs). */
|
|
GUEST_ASSERT(get_cr4() & X86_CR4_OSXSAVE);
|
|
|
|
/* verify CR4.OSXSAVE == CPUID.OSXSAVE */
|
|
GUEST_ASSERT(this_cpu_has(X86_FEATURE_OSXSAVE));
|
|
|
|
/*
|
|
* Notify hypervisor to clear CR4.0SXSAVE, do CPUID and save output,
|
|
* and then restore CR4. Do this all in assembly to ensure no AVX
|
|
* instructions are executed while OSXSAVE=0.
|
|
*/
|
|
asm volatile (
|
|
"out %%al, $" __stringify(MAGIC_HYPERCALL_PORT) "\n\t"
|
|
"cpuid\n\t"
|
|
"mov %%rdi, %%cr4\n\t"
|
|
: "+a" (regs[KVM_CPUID_EAX]),
|
|
"=b" (regs[KVM_CPUID_EBX]),
|
|
"+c" (regs[KVM_CPUID_ECX]),
|
|
"=d" (regs[KVM_CPUID_EDX])
|
|
: "D" (get_cr4())
|
|
);
|
|
|
|
/* Verify KVM cleared OSXSAVE in CPUID when it was cleared in CR4. */
|
|
GUEST_ASSERT(!(regs[X86_FEATURE_OSXSAVE.reg] & BIT(X86_FEATURE_OSXSAVE.bit)));
|
|
|
|
/* Verify restoring CR4 also restored OSXSAVE in CPUID. */
|
|
GUEST_ASSERT(this_cpu_has(X86_FEATURE_OSXSAVE));
|
|
|
|
GUEST_DONE();
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
struct kvm_vcpu *vcpu;
|
|
struct kvm_vm *vm;
|
|
struct kvm_sregs sregs;
|
|
struct ucall uc;
|
|
|
|
TEST_REQUIRE(kvm_cpu_has(X86_FEATURE_XSAVE));
|
|
|
|
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
|
|
|
|
while (1) {
|
|
vcpu_run(vcpu);
|
|
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_IO);
|
|
|
|
if (vcpu->run->io.port == MAGIC_HYPERCALL_PORT &&
|
|
vcpu->run->io.direction == KVM_EXIT_IO_OUT) {
|
|
/* emulate hypervisor clearing CR4.OSXSAVE */
|
|
vcpu_sregs_get(vcpu, &sregs);
|
|
sregs.cr4 &= ~X86_CR4_OSXSAVE;
|
|
vcpu_sregs_set(vcpu, &sregs);
|
|
continue;
|
|
}
|
|
|
|
switch (get_ucall(vcpu, &uc)) {
|
|
case UCALL_ABORT:
|
|
REPORT_GUEST_ASSERT(uc);
|
|
break;
|
|
case UCALL_DONE:
|
|
goto done;
|
|
default:
|
|
TEST_FAIL("Unknown ucall %lu", uc.cmd);
|
|
}
|
|
}
|
|
|
|
done:
|
|
kvm_vm_free(vm);
|
|
return 0;
|
|
}
|