linux.git/drivers/kvm/vmx.c, branch v2.6.22

KVM: Prevent guest fpu state from leaking into the host

2007-06-15T09:30:59+00:00

The lazy fpu changes did not take into account that some vmexit handlers
can sleep.  Move loading the guest state into the inner loop so that it
can be reloaded if necessary, and move loading the host state into
vmx_vcpu_put() so it can be performed whenever we relinquish the vcpu.

Signed-off-by: Avi Kivity

kvm: fix section mismatch warning in kvm-intel.o

2007-06-01T15:18:30+00:00

Fix following section mismatch warning in kvm-intel.o:
WARNING: o-i386/drivers/kvm/kvm-intel.o(.init.text+0xbd): Section mismatch: reference to .exit.text: (between 'hardware_setup' and 'vmx_disabled_by_bios')

The function free_kvm_area is used in the function alloc_kvm_area which
is marked __init.
The __exit area is discarded by some archs during link-time if a
module is built-in resulting in an oops.

Note: This warning is only seen by my local copy of modpost
      but the change will soon hit upstream.

Signed-off-by: Sam Ravnborg 
Cc: Avi Kivity 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Detach sched.h from mm.h

2007-05-21T16:18:19+00:00

First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.

This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
   getting them indirectly

Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
   they don't need sched.h
b) sched.h stops being dependency for significant number of files:
   on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
   after patch it's only 3744 (-8.3%).

Cross-compile tested on

	all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
	alpha alpha-up
	arm
	i386 i386-up i386-defconfig i386-allnoconfig
	ia64 ia64-up
	m68k
	mips
	parisc parisc-up
	powerpc powerpc-up
	s390 s390-up
	sparc sparc-up
	sparc64 sparc64-up
	um-x86_64
	x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig

as well as my two usual configs.

Signed-off-by: Alexey Dobriyan 
Signed-off-by: Linus Torvalds

KVM: Remove unused 'instruction_length'

2007-05-03T07:52:32+00:00

As we no longer emulate in userspace, this is meaningless.  We don't
compute it on SVM anyway.

Signed-off-by: Avi Kivity

KVM: VMX: Add lazy FPU support for VT

2007-05-03T07:52:31+00:00

Only save/restore the FPU host state when the guest is actually using the
FPU.

Signed-off-by: Anthony Liguori 
Signed-off-by: Avi Kivity

KVM: VMX: Properly shadow the CR0 register in the vcpu struct

2007-05-03T07:52:31+00:00

Set all of the host mask bits for CR0 so that we can maintain a proper
shadow of CR0.  This exposes CR0.TS, paving the way for lazy fpu handling.

Signed-off-by: Anthony Liguori 
Signed-off-by: Avi Kivity

KVM: Don't complain about cpu erratum AA15

2007-05-03T07:52:31+00:00

It slows down Windows x64 horribly.

Signed-off-by: Avi Kivity

KVM: Per-vcpu statistics

2007-05-03T07:52:30+00:00

Make the exit statistics per-vcpu instead of global.  This gives a 3.5%
boost when running one virtual machine per core on my two socket dual core
(4 cores total) machine.

Signed-off-by: Avi Kivity

KVM: VMX: Only save/restore MSR_K6_STAR if necessary

2007-05-03T07:52:30+00:00

Intel hosts only support syscall/sysret in long more (and only if efer.sce
is enabled), so only reload the related MSR_K6_STAR if the guest will
actually be able to use it.

This reduces vmexit cost by about 500 cycles (6400 -> 5870) on my setup.

Signed-off-by: Avi Kivity

KVM: Fold drivers/kvm/kvm_vmx.h into drivers/kvm/vmx.c

2007-05-03T07:52:30+00:00

No meat in that file.

Signed-off-by: Avi Kivity