Messages in this thread |  | | From | Thomas Gleixner <> | Subject | Re: [PATCH v2 3/6] kvm: x86: Emulate split-lock access as a write | Date | Tue, 11 Feb 2020 14:22:16 +0100 |
| |
Paolo Bonzini <pbonzini@redhat.com> writes: > On 03/02/20 16:16, Xiaoyao Li wrote: >> A sane guest should never tigger emulation on a split-lock access, but >> it cannot prevent malicous guest from doing this. So just emulating the >> access as a write if it's a split-lock access to avoid malicous guest >> polluting the kernel log. > > Saying that anything doing a split lock access is malicious makes little > sense.
Correct, but we also have to accept, that split lock access can be used in a malicious way, aka. DoS.
> Split lock detection is essentially a debugging feature, there's a > reason why the MSR is called "TEST_CTL". So you don't want to make the
The fact that it ended up in MSR_TEST_CTL does not say anything. That's where they it ended up to be as it was hastily cobbled together for whatever reason.
Thanks,
tglx
|  |