linux-toradex.git/drivers/kvm, branch v2.6.23-rc7

KVM: MMU: Fix rare oops on guest context switch

2007-09-14T20:59:55+00:00

A guest context switch to an uncached cr3 can require allocation of
shadow pages, but we only recycle shadow pages in kvm_mmu_page_fault().

Move shadow page recycling to mmu_topup_memory_caches(), which is called
from both the page fault handler and from guest cr3 reload.

Signed-off-by: Avi Kivity 
Signed-off-by: Linus Torvalds

KVM: Avoid calling smp_call_function_single() with interrupts disabled

2007-08-19T17:13:49+00:00

When taking a cpu down, we need to hardware_disable() it.
Unfortunately, the CPU_DYING notifier is called with interrupts
disabled, which means we can't use smp_call_function_single().

Fortunately, the CPU_DYING notifier is always called on the dying cpu,
so we don't need to use the function at all and can simply call
hardware_disable() directly.

Tested-by: Paolo Ornati 
Signed-off-by: Avi Kivity 
Signed-off-by: Linus Torvalds

Add some help texts to recently-introduced kconfig items

2007-08-18T16:52:50+00:00

Signed-off-by: Jan Engelhardt 
Signed-off-by: Stefan Richter  (edited MACINTOSH_DRIVERS per Geert Uytterhoeven's remark)
Signed-off-by: Linus Torvalds

KVM: x86 emulator: fix debug reg mov instructions

2007-08-07T00:54:41+00:00

More fallout from the writeback fixes: debug register transfer
instructions do their own writeback and thus need to disable the general
writeback mechanism.

This fixes oopses and some guest failures on AMD machines (the Intel
variant decodes the instruction in hardware and thus does not need
emulation).

Cc: Alistair John Strachan 
Signed-off-by: Avi Kivity 
Signed-off-by: Linus Torvalds

KVM: disable writeback for 0x0f 0x01 instructions.

2007-07-25T11:31:27+00:00

0x0f 0x01 instructions (ie lgdt, lidt, smsw, lmsw and invlpg) does
not use writeback. This patch set no_wb=1 when emulating those
instructions.

This fixes a regression booting the FreeBSD kernel on AMD.

Signed-off-by: Aurelien Jarno 
Signed-off-by: Avi Kivity

KVM: Fix removal of nx capability from guest cpuid

2007-07-25T11:31:13+00:00

Testing the wrong bit caused kvm not to disable nx on the guest when it is
disabled on the host (an mmu optimization relies on the nx bits being the
same in the guest and host).

This allows Windows to boot when nx is disabled on te host (e.g. when
host pae is disabled).

Signed-off-by: Avi Kivity

Revert "KVM: Avoid useless memory write when possible"

2007-07-25T11:30:56+00:00

This reverts commit a3c870bdce4d34332ebdba7eb9969592c4c6b243.  While it
does save useless updates, it (probably) defeats the fork detector, causing
a massive performance loss.

Signed-off-by: Avi Kivity

KVM: Fix unlikely kvm_create vs decache_vcpus_on_cpu race

2007-07-25T11:29:34+00:00

We add the kvm to the vm_list before initializing the vcpu mutexes,
which can be mutex_trylock()'ed by decache_vcpus_on_cpu().

Signed-off-by: Rusty Russell 
Signed-off-by: Avi Kivity

KVM: Correctly handle writes crossing a page boundary

2007-07-25T11:29:17+00:00

Writes that are contiguous in virtual memory may not be contiguous in
physical memory; so split writes that straddle a page boundary.

Thanks to Aurelien for reporting the bug, patient testing, and a fix
to this very patch.

Signed-off-by: Aurelien Jarno 
Signed-off-by: Avi Kivity

KVM: Require CONFIG_ANON_INODES

2007-07-22T18:13:59+00:00

Found by Sebastian Siewior and randconfig.

Signed-off-by: Avi Kivity 
Signed-off-by: Linus Torvalds