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Re: [Qemu-devel] [PATCH v2] pc: memhp: enforce minimal 128Mb alignment f
From: |
Igor Mammedov |
Subject: |
Re: [Qemu-devel] [PATCH v2] pc: memhp: enforce minimal 128Mb alignment for pc-dimm |
Date: |
Tue, 27 Oct 2015 09:48:37 +0100 |
On Tue, 27 Oct 2015 10:31:21 +0200
"Michael S. Tsirkin" <address@hidden> wrote:
> On Mon, Oct 26, 2015 at 02:24:32PM +0100, Igor Mammedov wrote:
> > Yep it's workaround but it works around QEMU's broken virtio
> > implementation in a simple way without need for guest side changes.
> >
> > Without foreseeable virtio fix it makes memory hotplug unusable and even
> > more so if there were a virtio fix it won't fix old guests since you've
> > said that virtio fix would require changes of both QEMU and guest sides.
>
> What makes it not foreseeable?
> Apparently only the fact that we have a work-around in place so no one
> works on it. I can code it up pretty quickly, but I'm flat out of time
> for testing as I'm going on vacation soon, and hard freeze is pretty
> close.
I can lend a hand for testing part.
>
> GPA space is kind of cheap, but wasting it in chunks of 512M
> seems way too aggressive.
hotplug region is sized with 1Gb alignment reserve per DIMM so we aren't
actually wasting anything here.
- [Qemu-devel] [PATCH v2] pc: memhp: enforce minimal 128Mb alignment for pc-dimm, Igor Mammedov, 2015/10/26
- Re: [Qemu-devel] [PATCH v2] pc: memhp: enforce minimal 128Mb alignment for pc-dimm, Michael S. Tsirkin, 2015/10/26
- Re: [Qemu-devel] [PATCH v2] pc: memhp: enforce minimal 128Mb alignment for pc-dimm, Igor Mammedov, 2015/10/26
- Re: [Qemu-devel] [PATCH v2] pc: memhp: enforce minimal 128Mb alignment for pc-dimm, Michael S. Tsirkin, 2015/10/27
- Re: [Qemu-devel] [PATCH v2] pc: memhp: enforce minimal 128Mb alignment for pc-dimm,
Igor Mammedov <=
- Re: [Qemu-devel] [PATCH v2] pc: memhp: enforce minimal 128Mb alignment for pc-dimm, Michael S. Tsirkin, 2015/10/27
- Re: [Qemu-devel] [PATCH v2] pc: memhp: enforce minimal 128Mb alignment for pc-dimm, Igor Mammedov, 2015/10/27
- Re: [Qemu-devel] [PATCH v2] pc: memhp: enforce minimal 128Mb alignment for pc-dimm, Eduardo Habkost, 2015/10/27
- Re: [Qemu-devel] [PATCH v2] pc: memhp: enforce minimal 128Mb alignment for pc-dimm, Igor Mammedov, 2015/10/29
- [Qemu-devel] RAM backend and guest ABI (was Re: [PATCH v2] pc: memhp: enforce minimal 128Mb) alignment for pc-dimm, Eduardo Habkost, 2015/10/29
- Re: [Qemu-devel] RAM backend and guest ABI (was Re: [PATCH v2] pc: memhp: enforce minimal 128Mb) alignment for pc-dimm, Igor Mammedov, 2015/10/30