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Avi Kivity fc3dffe121 [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>
2007-01-23 07:52:06 -08:00
..
Kconfig [PATCH] KVM: Put KVM in a new Virtualization menu 2006-12-13 09:05:46 -08:00
kvm.h [PATCH] KVM: MMU: Replace atomic allocations by preallocated objects 2007-01-05 23:55:27 -08:00
kvm_main.c [PATCH] KVM: make sure there is a vcpu context loaded when destroying the mmu 2007-01-23 07:52:06 -08:00
kvm_svm.h [PATCH] KVM: Replace __x86_64__ with CONFIG_X86_64 2006-12-13 09:05:46 -08:00
kvm_vmx.h [PATCH] KVM: Replace __x86_64__ with CONFIG_X86_64 2006-12-13 09:05:46 -08:00
Makefile [PATCH] kvm: userspace interface 2006-12-10 09:57:22 -08:00
mmu.c [PATCH] KVM: Simplify mmu_alloc_roots() 2007-01-05 23:55:28 -08:00
paging_tmpl.h [PATCH] KVM: fix bogus pagefault on writable pages 2007-01-23 07:52:06 -08:00
segment_descriptor.h [PATCH] kvm: userspace interface 2006-12-10 09:57:22 -08:00
svm.c [PATCH] KVM: fix race between mmio reads and injected interrupts 2007-01-23 07:52:06 -08:00
svm.h [PATCH] kvm: userspace interface 2006-12-10 09:57:22 -08:00
vmx.c [PATCH] KVM: fix race between mmio reads and injected interrupts 2007-01-23 07:52:06 -08:00
vmx.h [PATCH] KVM: Rename some msrs 2006-12-30 10:56:44 -08:00
x86_emulate.c [PATCH] KVM: x86 emulator: fix bit string instructions 2007-01-23 07:52:06 -08:00
x86_emulate.h [PATCH] KVM: Replace __x86_64__ with CONFIG_X86_64 2006-12-13 09:05:46 -08:00