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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 08:39:57 +0100 |
On Mon, 26 Oct 2015 21:42:05 +0300
Andrey Korolyov <address@hidden> wrote:
> > How about following comment:
> > /* Linux guests expect 512/64/128Mb alignment for PAE/x32/x64 arch
> > * respectively. Windows works fine with 2Mb. To make sure that
> > * memory hotplug would work with above flavors of Linux set
> > * minimal alignment to 512Mb (i.e. PAE arch).
> > * Enforcing minimal alignment bigger than that of a backend
> > * (2Mb for memory-backend-ram) changes GPAs of the 2nd and
> > * following DIMMs which breaks migration for older machine types,
> > * so force minimal alignment only since 2.5 machine type and do not
> > * apply it to older machine types (prior 2.5)
> > */
> >
>
>
> PAE guests are working with 128Mb alignment just fine, at least
> 3.8...3.16 I`ve tried previously, have you seen a counter-example?
Issue is seen only during unplug when DIMM is not aligned to
SECTION_SIZE_BITS.
- [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, 2015/10/27
- 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