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Re: [Qemu-block] [PATCH] pflash: Only read non-zero parts of backend ima
From: |
Xiang Zheng |
Subject: |
Re: [Qemu-block] [PATCH] pflash: Only read non-zero parts of backend image |
Date: |
Mon, 6 May 2019 10:51:52 +0800 |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:64.0) Gecko/20100101 Thunderbird/64.0 |
On 2019/5/5 23:37, Peter Maydell wrote:
> On Sun, 5 May 2019 at 08:02, Xiang Zheng <address@hidden> wrote:
>>
>> Currently we fill the memory space with two 64MB NOR images when
>> using persistent UEFI variables on virt board. Actually we only use
>> a very small(non-zero) part of the memory while the rest significant
>> large(zero) part of memory is wasted.
>>
>> So this patch checks the block status and only writes the non-zero part
>> into memory. This requires pflash devices to use sparse files for
>> backends.
>
> Do you mean "pflash devices will no longer work if the file
> that is backing them is not sparse", or just "if the file that
> is backing them is not sparse then you won't get the benefit
> of using less memory" ?
>
I mean the latter, if the file is not sparse, nothing would change.
I will improve this commit message in the next version.
--
Thanks,
Xiang
- [Qemu-block] [PATCH] pflash: Only read non-zero parts of backend image, Xiang Zheng, 2019/05/05
- Re: [Qemu-block] [PATCH] pflash: Only read non-zero parts of backend image, Peter Maydell, 2019/05/05
- Re: [Qemu-block] [PATCH] pflash: Only read non-zero parts of backend image,
Xiang Zheng <=
- Re: [Qemu-block] [Qemu-devel] [PATCH] pflash: Only read non-zero parts of backend image, Markus Armbruster, 2019/05/07
- Re: [Qemu-block] [Qemu-devel] [PATCH] pflash: Only read non-zero parts of backend image, Laszlo Ersek, 2019/05/07
- Re: [Qemu-block] [Qemu-devel] [PATCH] pflash: Only read non-zero parts of backend image, Markus Armbruster, 2019/05/08
- Re: [Qemu-block] [Qemu-devel] [PATCH] pflash: Only read non-zero parts of backend image, Xiang Zheng, 2019/05/09
- Re: [Qemu-block] [Qemu-devel] [PATCH] pflash: Only read non-zero parts of backend image, Markus Armbruster, 2019/05/09
- Re: [Qemu-block] [Qemu-devel] [PATCH] pflash: Only read non-zero parts of backend image, Xiang Zheng, 2019/05/10
- Re: [Qemu-block] [Qemu-devel] [PATCH] pflash: Only read non-zero parts of backend image, Markus Armbruster, 2019/05/10
- Re: [Qemu-block] [Qemu-devel] [PATCH] pflash: Only read non-zero parts of backend image, Xiang Zheng, 2019/05/11
- Re: [Qemu-block] [Qemu-devel] [PATCH] pflash: Only read non-zero parts of backend image, Markus Armbruster, 2019/05/13
- Re: [Qemu-block] [Qemu-devel] [PATCH] pflash: Only read non-zero parts of backend image, Kevin Wolf, 2019/05/13