linux-kernel - Re: [PATCH 0/2] KVM: x86: limit interactions between IOAPIC and LAPIC

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Date:	Wed, 29 Jul 2015 14:00:12 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	yang.z.zhang@...el.com, srutherford@...el.com
Subject: Re: [PATCH 0/2] KVM: x86: limit interactions between IOAPIC and
 LAPIC

On Wed, 2015-07-29 at 15:37 +0200, Paolo Bonzini wrote:
> Inspired by the split irqchip patches, this series limits the
> IOAPIC<->LAPIC to the EOI exit bitmap that is inferred from the
> redirection table.
> 
> TMR is entirely handled within the local APIC, and no global copy
> of the IOAPIC-handled vectors is necessary anymore.  This makes
> it simpler to introduce a userspace IOAPIC.
> 
> Tested with ioapic.flat for now, planning to do more complete tests
> tomorrow.  The most interesting test to do here is an assigned device
> that uses INTX, so I am CCing Alex Williamson for a heads up.

Tested Windows and Linux guests with assigned devices restricted to INTx
mode, no obvious regression.  Thanks,

Alex

> Paolo Bonzini (2):
>   KVM: x86: set TMR when the interrupt is accepted
>   KVM: x86: store IOAPIC-handled vectors in each VCPU
> 
>  arch/x86/include/asm/kvm_host.h |  3 ++-
>  arch/x86/kvm/ioapic.c           | 27 ++++-----------------------
>  arch/x86/kvm/ioapic.h           | 11 +----------
>  arch/x86/kvm/lapic.c            | 29 ++++++++++++++++++-----------
>  arch/x86/kvm/lapic.h            |  1 -
>  arch/x86/kvm/svm.c              |  2 +-
>  arch/x86/kvm/vmx.c              |  3 ++-
>  arch/x86/kvm/x86.c              | 11 +++--------
>  8 files changed, 31 insertions(+), 56 deletions(-)
> 



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