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Date: Mon, 19 Oct 2020 13:35:47 -0400 From: Peter Xu <peterx@...hat.com> To: Paolo Bonzini <pbonzini@...hat.com> Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org, Alexander Graf <graf@...zon.com>, Aaron Lewis <aaronlewis@...gle.com>, Sean Christopherson <sean.j.christopherson@...el.com> Subject: Re: [PATCH] KVM: VMX: Forbid userspace MSR filters for x2APIC On Mon, Oct 19, 2020 at 01:05:19PM -0400, Paolo Bonzini wrote: > Allowing userspace to intercept reads to x2APIC MSRs when APICV is > fully enabled for the guest simply can't work. But more in general, > if the LAPIC is in-kernel, allowing accessed by userspace would be very > confusing. If userspace wants to intercept x2APIC MSRs, then it should > first disable in-kernel APIC. > > We could in principle allow userspace to intercept reads and writes to TPR, > and writes to EOI and SELF_IPI, but while that could be made it work, it > would still be silly. > > Cc: Alexander Graf <graf@...zon.com> > Cc: Aaron Lewis <aaronlewis@...gle.com> > Cc: Peter Xu <peterx@...hat.com> > Cc: Sean Christopherson <sean.j.christopherson@...el.com> > Signed-off-by: Paolo Bonzini <pbonzini@...hat.com> Acked-by: Peter Xu <peterx@...hat.com> -- Peter Xu
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