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From: | Gerd Hoffmann |
Subject: | Re: [Qemu-devel] [PATCH 0/2] msi support for virtfs |
Date: | Thu, 11 Nov 2010 19:47:52 +0100 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.9) Gecko/20100827 Red Hat/3.1.3-1.el6 Thunderbird/3.1.3 |
On 11/11/10 16:37, Aneesh Kumar K. V wrote:
On Thu, 11 Nov 2010 12:59:24 +0100, Gerd Hoffmann<address@hidden> wrote:Hi, This tiny patch series adds msi support for virtfs. It's two patches only because we need a compat property to stay compatible with -stable and we don't have a pc-0.14 machine type yet, so this is added first.Sorry for being dumb. But what does the above change help to achieve.
msi support makes the IRQ handling more efficient (no IRQ sharing, no need to ack the IRQ to the ioapic). Look at /proc/interupts with and without the patch ...
The compat property is for migration compatibility: qemu 0.14 should be able to migrate to 0.13 with -M pc-0.13. To archive that we have to disable new stuff which affects the savevm format (msi support does).
HTH Gerd
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