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[Bug 714629] Re: BIOS doesn't load when read() returns less than the ful
From: |
Philippe Mathieu-Daudé |
Subject: |
[Bug 714629] Re: BIOS doesn't load when read() returns less than the full ROM length |
Date: |
Thu, 04 Jun 2020 15:00:52 -0000 |
Fix included in QEMU v4.0.0.
** Changed in: qemu
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/714629
Title:
BIOS doesn't load when read() returns less than the full ROM length
Status in QEMU:
Fix Released
Bug description:
When qemu is running over a 9p filesystem (e.g. when running
underneath -virtfs of another qemu), and probably some other network
filesystems, it fails to read its BIOS image. This is because it uses
a single low-level read() call on the bios.bin, asking for the full
file. However read() may return less than the full length, and it's
the caller's responsibility to call it repeatedly if necessary. When
read does come up short, qemu doesn't repeat the call, and reports an
error instead. The attached patch fixes the one problem I saw, but I
haven't tried to cover the general case (e.g. extension ROMs).
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