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[Qemu-devel] [Bug 1078892] [NEW] qemu doesn't general protection fault i


From: Alexander Chernyakhovsky
Subject: [Qemu-devel] [Bug 1078892] [NEW] qemu doesn't general protection fault if there are reserved bits set in page-directory-pointer table entries
Date: Wed, 14 Nov 2012 20:48:38 -0000

Public bug reported:

While working on implementing 32-bit PAE mode in a custom operating
system, which I was testing in QEMU, I noticed that my OS worked
correctly, but resulted in a general protection fault when booted on
VMware, VirtualBox, or bochs.

According to the Intel Architecture Manual, Volume 3A, Section 4.4.1
"PDPTE Registers", "If any of the PDPTEs sets both the P flag (bit 0)
and any reserved bit, the MOV to CR instruction causes a general-
protection exception (#GP(0)) and the PDPTEs are not loaded." QEMU does
not emulate this behavior.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1078892

Title:
  qemu doesn't general protection fault if there are reserved bits set
  in page-directory-pointer table entries

Status in QEMU:
  New

Bug description:
  While working on implementing 32-bit PAE mode in a custom operating
  system, which I was testing in QEMU, I noticed that my OS worked
  correctly, but resulted in a general protection fault when booted on
  VMware, VirtualBox, or bochs.

  According to the Intel Architecture Manual, Volume 3A, Section 4.4.1
  "PDPTE Registers", "If any of the PDPTEs sets both the P flag (bit 0)
  and any reserved bit, the MOV to CR instruction causes a general-
  protection exception (#GP(0)) and the PDPTEs are not loaded." QEMU
  does not emulate this behavior.

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