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Re: [Qemu-arm] [Qemu-devel] [RFC PATCH] hw/arm/virt: use variable size o

From: Xiang Zheng
Subject: Re: [Qemu-arm] [Qemu-devel] [RFC PATCH] hw/arm/virt: use variable size of flash device to save memory
Date: Fri, 12 Apr 2019 09:52:44 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:64.0) Gecko/20100101 Thunderbird/64.0

On 2019/4/11 20:22, Kevin Wolf wrote:
> Okay, so your problem is that blk_pread() writes to the whole buffer,
> writing explicit zeroes for unallocated parts of the image, while you
> would like to leave those parts of the buffer untouched so that we don't
> actually allocate the memory, but can just use the shared zero page.
> If you just want to read the non-zero parts of the image, that can be
> done by using a loop that calls bdrv_block_status() and only reads from
> the image if the BDRV_BLOCK_ZERO bit is clear.
> Would this solve your problem?

Sounds good! What if guest tried to read/write the zero parts?



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