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List: kvm
Subject: Re: [PATCH 0/3] kvm: APICv register write workaround
From: Paolo Bonzini <pbonzini () redhat ! com>
Date: 2014-10-31 15:06:49
Message-ID: 5453A589.6040308 () redhat ! com
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On 30/10/2014 15:06, Radim Krčmář wrote:
> APICv traps register writes, so we can't retrieve previous value, but
> our code depends on detecting changes.
Applied, thanks.
Paolo
> Apart from disabling APIC register virtualization, we can detect the
> change by using extra memory. One value history is enough, but we still
> don't want to keep it for every APIC register, for performance reasons.
> This leaves us with either a new framework, or exceptions ...
> The latter options fits KVM's path better [1,2].
>
> And when we already mirror a part of registers, optimizing access is
> acceptable [3]. (Squashed to keep bisecters happy.)
>
> ---
> Radim Krčmář (3):
> KVM: x86: detect SPIV changes under APICv
> KVM: x86: detect LVTT changes under APICv
> KVM: x86: optimize some accesses to LVTT and SPIV
>
> arch/x86/kvm/lapic.c | 32 +++++++++++++++++---------------
> arch/x86/kvm/lapic.h | 8 +++++---
> 2 files changed, 22 insertions(+), 18 deletions(-)
>
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