[Bug 1180923] Re: unused memory filled with 0x00 instead of 0xFF

[Evren]

I am using Qemu 8.0.0 and this issue happens only when kvm is enabled, tcg 
initialized the unused bytes to 0xFF as a real machine and works normally, so a 
question in my mind, does kvm use those umb area for increased performance?
If emm386 M5 is used for using area D000-D7FF as frame page, emm386 gives a 
warning that there is an option rom in this location but it still uses this 
area, seems like a workaround, i do not know if it will have any side effect

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https://bugs.launchpad.net/bugs/1180923

Title:
  unused memory filled with 0x00 instead of 0xFF

Status in QEMU:
  Expired

Bug description:
  Qemu, ever since it was made (so, since 2003), has this problem in DOS
  (either PC-DOS or MS-DOS and partly Windows 9x) not recognizing the
  memory available when the memory is filled with 0x00 but when it is
  filled with 0xFF it gets recognized properly, where should I patch
  qemu to solve this memory problem?

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