diff options
author | Avi Kivity <avi@qumranet.com> | 2007-01-22 23:40:40 -0500 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-01-23 10:52:06 -0500 |
commit | fc3dffe12148b9612870eb21b24f2aecefa9ea24 (patch) | |
tree | 67a7671e73e5e962355885ffa7a25821c27247e7 /drivers/rtc | |
parent | 038e51de2e7ae2c8e9d8a0b15231f8509875dc33 (diff) |
[PATCH] KVM: fix bogus pagefault on writable pages
If a page is marked as dirty in the guest pte, set_pte_common() can set the
writable bit on newly-instantiated shadow pte. This optimization avoids
a write fault after the initial read fault.
However, if a write fault instantiates the pte, fix_write_pf() incorrectly
reports the fault as a guest page fault, and the guest oopses on what appears
to be a correctly-mapped page.
Fix is to detect the condition and only report a guest page fault on a user
access to a kernel page.
With the fix, a kvm guest can survive a whole night of running the kernel
hacker's screensaver (make -j9 in a loop).
Signed-off-by: Avi Kivity <avi@qumranet.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/rtc')
0 files changed, 0 insertions, 0 deletions