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KVM: selftests: Cache CPUID in struct kvm_vcpu

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Cache a vCPU's CPUID information in "struct kvm_vcpu" to allow fixing the
mess where tests, often unknowingly, modify the global/static "cpuid"
allocated by kvm_get_supported_cpuid().

Add vcpu_init_cpuid() to handle stuffing an entirely different CPUID
model, e.g. during vCPU creation or when switching to the Hyper-V enabled
CPUID model.  Automatically refresh the cache on vcpu_set_cpuid() so that
any adjustments made by KVM are always reflected in the cache.  Drop
vcpu_get_cpuid() entirely to force tests to use the cache, and to allow
adding e.g. vcpu_get_cpuid_entry() in the future without creating a
conflicting set of APIs where vcpu_get_cpuid() does KVM_GET_CPUID2, but
vcpu_get_cpuid_entry() does not.

Opportunistically convert the VMX nested state test and KVM PV test to
manipulating the vCPU's CPUID (because it's easy), but use
vcpu_init_cpuid() for the Hyper-V features test and "emulator error" test
to effectively retain their current behavior as they're less trivial to
convert.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220614200707.3315957-19-seanjc@google.com
This commit is contained in:
Sean Christopherson
2022-06-14 20:06:43 +00:00
parent fc66963d7b
commit 7fbc6038ac
11 changed files with 69 additions and 50 deletions
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5
tools/testing/selftests/kvm/include/kvm_util_base.h
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@@ -50,6 +50,9 @@ struct kvm_vcpu {
int fd;
struct kvm_vm *vm;
struct kvm_run *run;
#ifdef __x86_64__
struct kvm_cpuid2 *cpuid;
#endif
struct kvm_dirty_gfn *dirty_gfns;
uint32_t fetch_index;
uint32_t dirty_gfns_count;
@@ -748,6 +751,8 @@ static inline struct kvm_vcpu *vm_vcpu_recreate(struct kvm_vm *vm,
return vm_arch_vcpu_recreate(vm, vcpu_id);
}
void vcpu_arch_free(struct kvm_vcpu *vcpu);
void virt_arch_pgd_alloc(struct kvm_vm *vm);
static inline void virt_pgd_alloc(struct kvm_vm *vm)