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KVM: x86: Add a VALID_MASK for the MSR exit reason flags

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Add the mask KVM_MSR_EXIT_REASON_VALID_MASK for the MSR exit reason
flags.  This simplifies checks that validate these flags, and makes it
easier to introduce new flags in the future.

No functional change intended.

Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Message-Id: <20220921151525.904162-3-aaronlewis@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Aaron Lewis 2022-09-21 15:15:22 +00:00 committed by Paolo Bonzini
parent be83794210
commit db205f7e1e
2 changed files with 4 additions and 3 deletions
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4
arch/x86/kvm/x86.c
View File

@ -6230,9 +6230,7 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
break;
case KVM_CAP_X86_USER_SPACE_MSR:
r = -EINVAL;
if (cap->args[0] & ~(KVM_MSR_EXIT_REASON_INVAL |
KVM_MSR_EXIT_REASON_UNKNOWN |
KVM_MSR_EXIT_REASON_FILTER))
if (cap->args[0] & ~KVM_MSR_EXIT_REASON_VALID_MASK)
break;
kvm->arch.user_space_msr_mask = cap->args[0];
r = 0;

3
include/uapi/linux/kvm.h
View File

@ -485,6 +485,9 @@ struct kvm_run {
#define KVM_MSR_EXIT_REASON_INVAL (1 << 0)
#define KVM_MSR_EXIT_REASON_UNKNOWN (1 << 1)
#define KVM_MSR_EXIT_REASON_FILTER (1 << 2)
#define KVM_MSR_EXIT_REASON_VALID_MASK (KVM_MSR_EXIT_REASON_INVAL | \
KVM_MSR_EXIT_REASON_UNKNOWN | \
KVM_MSR_EXIT_REASON_FILTER)
__u32 reason; /* kernel -> user */
__u32 index; /* kernel -> user */
__u64 data; /* kernel <-> user */