lkml.org 
[lkml]   [2008]   [May]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH 4 of 5] xen: allow some cr4 updates
Date
From
The guest can legitimately change things like cr4.OSFXSR and
OSXMMEXCPT, so let it.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
---
arch/x86/xen/enlighten.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -648,8 +648,10 @@

static void xen_write_cr4(unsigned long cr4)
{
- /* Just ignore cr4 changes; Xen doesn't allow us to do
- anything anyway. */
+ cr4 &= ~X86_CR4_PGE;
+ cr4 &= ~X86_CR4_PSE;
+
+ native_write_cr4(cr4);
}

static unsigned long xen_read_cr3(void)



\
 
 \ /
  Last update: 2008-05-23 15:17    [W:0.042 / U:1.364 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site