[Qemu-devel] [Bug 714629] Re: BIOS doesn't load when read() returns less than the full ROM length

[Qemu-devel] [Bug 714629] Re: BIOS doesn't load when read() returns less than the full ROM length

[Matthew Bloch]

** Patch added: "Fix loading of BIOS file over 9p/network filesystems"
   https://bugs.launchpad.net/bugs/714629/+attachment/1836057/+files/rom_read.patch

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Title:
  BIOS doesn't load when read() returns less than the full ROM length

Status in QEMU:
  New

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).

[Qemu-devel] [Bug 714629] [NEW] BIOS doesn't load when read() returns less than the full ROM length

[Matthew Bloch]

Public bug reported:

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).

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: bios

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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:
  New

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).

[Bug 714629] Re: BIOS doesn't load when read() returns less than the full ROM length

[Philippe Mathieu-Daudé]

This seems to have been fixed by commit
1f40547f5ce0c135faa7d14f066b97002fd8c204.

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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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[Bug 714629] Re: BIOS doesn't load when read() returns less than the full ROM length

[Philippe Mathieu-Daudé]

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).

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/714629/+subscriptions