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[Qemu-devel] [Bug 1078892] Re: qemu doesn't general protection fault if
From: |
Thomas Huth |
Subject: |
[Qemu-devel] [Bug 1078892] Re: qemu doesn't general protection fault if there are reserved bits set in page-directory-pointer table entries |
Date: |
Fri, 07 Apr 2017 13:54:26 -0000 |
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
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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:
Incomplete
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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Thomas Huth <=