Re: [edk2-devel] QEMU / OVMF ESP corruption

["Gerd Hoffmann" <kraxel@redhat.com>]

  Hi,

> This pattern seen during the EFI stub preamble is also seen during OVMF
> startup, so it seems this is some common EFI VAR ? related code. At OVMF
> startup this seems to repeat a number of times before Grub starts.
> 
> ===> If I move OVMF to pflash disks for code + vars, this issue does not
> happen.

Most likely this is OVMF reading/writing NvVars file (EFI variable
storage).  When using pflash OVMF doesn't do that.

It's a very fundamental design bug in grub.  Grub uses its own code for
alot of stuff instead of calling EFI services.  Which includes the FAT
filesystem driver.  Result is that there are *two* FAT filesystem
drivers active in the system (both edk2 and grub driver), stomping on
each others feed, especially if both are used for write access to the
file system.

take care,
  Gerd



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