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Re: [Qemu-block] [QEMU] [PATCH v5 0/8] Add Qemu to SeaBIOS LCHS interfac

From: Max Reitz
Subject: Re: [Qemu-block] [QEMU] [PATCH v5 0/8] Add Qemu to SeaBIOS LCHS interface
Date: Tue, 13 Aug 2019 21:35:06 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 26.06.19 14:39, Sam Eiderman wrote:
> v1:
> Non-standard logical geometries break under QEMU.
> A virtual disk which contains an operating system which depends on
> logical geometries (consistent values being reported from BIOS INT13
> AH=08) will most likely break under QEMU/SeaBIOS if it has non-standard
> logical geometries - for example 56 SPT (sectors per track).
> No matter what QEMU will guess - SeaBIOS, for large enough disks - will
> use LBA translation, which will report 63 SPT instead.
> In addition we can not enforce SeaBIOS to rely on phyiscal geometries at
> all. A virtio-blk-pci virtual disk with 255 phyiscal heads can not
> report more than 16 physical heads when moved to an IDE controller, the
> ATA spec allows a maximum of 16 heads - this is an artifact of
> virtualization.
> By supplying the logical geometies directly we are able to support such
> "exotic" disks.
> We will use fw_cfg to do just that.

(From a block perspective,) I didn’t find anything too bad, so:

Acked-by: Max Reitz <address@hidden>

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