linux-kernel - Re: [PATCH] KVM: x86: Document an erratum in KVM_SET_VCPU

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Message-ID: <173039507056.1509043.12101873900724716741.b4-ty@google.com>
Date: Thu, 31 Oct 2024 12:51:41 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: Document an erratum in KVM_SET_VCPU_EVENTS on
 Intel CPUs

On Fri, 02 Aug 2024 13:04:20 -0700, Sean Christopherson wrote:
> Document a flaw in KVM's ABI which lets userspace attempt to inject a
> "bad" hardware exception event, and thus induce VM-Fail on Intel CPUs.
> Fixing the flaw is a fool's errand, as AMD doesn't sanity check the
> validity of the error code, Intel CPUs that support CET relax the check
> for Protected Mode, userspace can change the mode after queueing an
> exception, KVM ignores the error code when emulating Real Mode exceptions,
> and so on and so forth.
> 
> [...]

Applied to kvm-x86 misc, thanks!

[1/1] KVM: x86: Document an erratum in KVM_SET_VCPU_EVENTS on Intel CPUs
      https://github.com/kvm-x86/linux/commit/eebc1cfae6c9

--
https://github.com/kvm-x86/linux/tree/next