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Re: [Qemu-devel] [PATCH] ide: remove hardcoded 2GiB transactional limit
From: |
John Snow |
Subject: |
Re: [Qemu-devel] [PATCH] ide: remove hardcoded 2GiB transactional limit |
Date: |
Mon, 2 Nov 2015 14:54:32 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 10/27/2015 12:50 PM, Stefan Hajnoczi wrote:
> On Mon, Oct 26, 2015 at 07:38:02PM -0400, John Snow wrote:
>> Not that you can request a >2GiB transaction, but that's why checking
>> for it makes no sense anymore.
>>
>> With the newer 'limit' parameter to prepare_buf, we no longer need a
>> static limit. The maximum limit is still 2GiB, but the limit parameter
>> is set to the current transaction size, which cannot surpass 32MiB
>> (512 * 65536). If the PRDT surpasses the transactional size, then,
>> we'll just carry out the normative underflow handling pathways instead
>> of needing an extra, strange pathway that worries about hitting some
>> logistical cap for the largest sglist we can support -- we'll never
>> even attempt to build one that big anymore.
>>
>> Reported-by: Kevin Wolf <address@hidden>
>> Signed-off-by: John Snow <address@hidden>
>> ---
>> hw/ide/ahci.c | 30 ++++++++++++++----------------
>> hw/ide/internal.h | 2 +-
>> hw/ide/pci.c | 7 -------
>> 3 files changed, 15 insertions(+), 24 deletions(-)
>
> Acked-by: Stefan Hajnoczi <address@hidden>
>
Thanks, applied to my IDE tree:
https://github.com/jnsnow/qemu/commits/ide
https://github.com/jnsnow/qemu.git
--js
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