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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>
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Test edge cases and race conditions in kvm_recalculate_apic_map().
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*/
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#include <sys/ioctl.h>
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#include <pthread.h>
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#include <time.h>
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#include "processor.h"
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#include "test_util.h"
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#include "kvm_util.h"
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#include "apic.h"
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#define TIMEOUT 5 /* seconds */
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#define LAPIC_DISABLED 0
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#define LAPIC_X2APIC (MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE)
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#define MAX_XAPIC_ID 0xff
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static void *race(void *arg)
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{
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struct kvm_lapic_state lapic = {};
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struct kvm_vcpu *vcpu = arg;
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while (1) {
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/* Trigger kvm_recalculate_apic_map(). */
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vcpu_ioctl(vcpu, KVM_SET_LAPIC, &lapic);
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pthread_testcancel();
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}
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return NULL;
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}
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int main(void)
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{
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struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
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struct kvm_vcpu *vcpuN;
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struct kvm_vm *vm;
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pthread_t thread;
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time_t t;
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int i;
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kvm_static_assert(KVM_MAX_VCPUS > MAX_XAPIC_ID);
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/*
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* Create the max number of vCPUs supported by selftests so that KVM
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* has decent amount of work to do when recalculating the map, i.e. to
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* make the problematic window large enough to hit.
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*/
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vm = vm_create_with_vcpus(KVM_MAX_VCPUS, NULL, vcpus);
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/*
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* Enable x2APIC on all vCPUs so that KVM doesn't bail from the recalc
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* due to vCPUs having aliased xAPIC IDs (truncated to 8 bits).
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*/
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for (i = 0; i < KVM_MAX_VCPUS; i++)
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vcpu_set_msr(vcpus[i], MSR_IA32_APICBASE, LAPIC_X2APIC);
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TEST_ASSERT_EQ(pthread_create(&thread, NULL, race, vcpus[0]), 0);
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vcpuN = vcpus[KVM_MAX_VCPUS - 1];
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for (t = time(NULL) + TIMEOUT; time(NULL) < t;) {
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vcpu_set_msr(vcpuN, MSR_IA32_APICBASE, LAPIC_X2APIC);
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vcpu_set_msr(vcpuN, MSR_IA32_APICBASE, LAPIC_DISABLED);
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}
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TEST_ASSERT_EQ(pthread_cancel(thread), 0);
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TEST_ASSERT_EQ(pthread_join(thread, NULL), 0);
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kvm_vm_free(vm);
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return 0;
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}
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