linux-kernel - Re: [PATCH 0/8] KVM: minor APIC fixes and cleanups

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Date:	Fri, 30 Jan 2015 10:22:12 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>,
	linux-kernel@...r.kernel.org
CC:	kvm@...r.kernel.org, Nadav Amit <namit@...technion.ac.il>,
	Gleb Natapov <gleb@...nel.org>
Subject: Re: [PATCH 0/8] KVM: minor APIC fixes and cleanups



On 29/01/2015 22:48, Radim Krčmář wrote:
> This patch series is made our of three logical parts,
> 
> [1-3/8] are just a cleanup and could be omitted
> [4-6/8] improve broadcast detection and unoptimized delivery
> [7-8/8] handle mixed mode (by falling back to improvements from [5-6/9])

I applied patches 1-4 and commented on patch 5.

I'm afraid that patches 7-8 could lead to missed optimizations in some cases.

Regarding patch 6, perhaps there's a way to avoid this:

+	/* XXX: A superset of x2APIC broadcasts is fine in practice as long as
+	 * we don't support APIC ID > 0xfeffffff.
+	 */

It's ugly. :)

Paolo

> 
> Radim Krčmář (8):
>   KVM: x86: return bool from kvm_apic_match*()
>   KVM: x86: cleanup kvm_apic_match_*()
>   KVM: x86: replace 0 with APIC_DEST_PHYSICAL
>   KVM: x86: fix x2apic logical address matching
>   KVM: x86: use MDA for interrupt matching
>   KVM: x86: allow mixed APIC mode broadcast
>   KVM: x86: avoid logical_map when it is invalid
>   KVM: x86: simplify kvm_apic_map
> 
>  arch/x86/include/asm/kvm_host.h |   4 +-
>  arch/x86/kvm/ioapic.h           |   2 +-
>  arch/x86/kvm/lapic.c            | 176 +++++++++++++++++++---------------------
>  arch/x86/kvm/lapic.h            |  35 ++++----
>  4 files changed, 106 insertions(+), 111 deletions(-)
> 
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