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| author |   Oliver Upton <oupton@google.com> | 2022-03-01 06:03:47 +0000 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2022-03-21 09:28:41 -0400 |
| commit | 6d8491910fcd3324d0f0ece3bd68e85ead3a04d7 (patch) | |
| tree | b5ff91162ae5eb371f8a4c94d9916ba2bf799684 /include/uapi/linux/kvm.h | |
| parent | kvm: x86: Require const tsc for RT (diff) | |
| download | linux-dev-6d8491910fcd3324d0f0ece3bd68e85ead3a04d7.tar.xz linux-dev-6d8491910fcd3324d0f0ece3bd68e85ead3a04d7.zip | |
KVM: x86: Introduce KVM_CAP_DISABLE_QUIRKS2
KVM_CAP_DISABLE_QUIRKS is irrevocably broken. The capability does not
advertise the set of quirks which may be disabled to userspace, so it is
impossible to predict the behavior of KVM. Worse yet,
KVM_CAP_DISABLE_QUIRKS will tolerate any value for cap->args[0], meaning
it fails to reject attempts to set invalid quirk bits.
The only valid workaround for the quirky quirks API is to add a new CAP.
Actually advertise the set of quirks that can be disabled to userspace
so it can predict KVM's behavior. Reject values for cap->args[0] that
contain invalid bits.
Finally, add documentation for the new capability and describe the
existing quirks.
Signed-off-by: Oliver Upton <oupton@google.com>
Message-Id: <20220301060351.442881-5-oupton@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/uapi/linux/kvm.h')
| -rw-r--r-- | include/uapi/linux/kvm.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index d2f1efc3aa35..91a6fe4e02c0 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1143,6 +1143,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_PPC_AIL_MODE_3 210 #define KVM_CAP_S390_MEM_OP_EXTENSION 211 #define KVM_CAP_PMU_CAPABILITY 212 +#define KVM_CAP_DISABLE_QUIRKS2 213 #ifdef KVM_CAP_IRQ_ROUTING |