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

Bug #1078892 reported by Alexander Chernyakhovsky on 2012-11-14
This bug affects 1 person
Affects Status Importance Assigned to Milestone

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.

Thomas Huth (th-huth) wrote :

Triaging old bug tickets ... can you still reproduce this issue with the
latest version of QEMU (version 2.9)?

Changed in qemu:
status: New → Incomplete
Launchpad Janitor (janitor) wrote :

[Expired for QEMU because there has been no activity for 60 days.]

Changed in qemu:
status: Incomplete → Expired
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