linux/drivers/kvm
Jeremy Fitzhardinge 464d1a78fb [PATCH] i386: Convert i386 PDA code to use %fs
Convert the PDA code to use %fs rather than %gs as the segment for
per-processor data.  This is because some processors show a small but
measurable performance gain for reloading a NULL segment selector (as %fs
generally is in user-space) versus a non-NULL one (as %gs generally is).

On modern processors the difference is very small, perhaps undetectable.
Some old AMD "K6 3D+" processors are noticably slower when %fs is used
rather than %gs; I have no idea why this might be, but I think they're
sufficiently rare that it doesn't matter much.

This patch also fixes the math emulator, which had not been adjusted to
match the changed struct pt_regs.

[frederik.deweerdt@gmail.com: fixit with gdb]
[mingo@elte.hu: Fix KVM too]

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Ian Campbell <Ian.Campbell@XenSource.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Zachary Amsden <zach@vmware.com>
Cc: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
2007-02-13 13:26:20 +01:00
..
Kconfig
kvm_main.c [PATCH] KVM: Host suspend/resume support 2007-02-12 09:48:41 -08:00
kvm_svm.h
kvm_vmx.h
kvm.h [PATCH] KVM: cpu hotplug support 2007-02-12 09:48:41 -08:00
Makefile
mmu.c
paging_tmpl.h
segment_descriptor.h
svm.c [PATCH] KVM: cpu hotplug support 2007-02-12 09:48:41 -08:00
svm.h
vmx.c [PATCH] i386: Convert i386 PDA code to use %fs 2007-02-13 13:26:20 +01:00
vmx.h
x86_emulate.c
x86_emulate.h