diff options
| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-05-26 23:31:04 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-27 10:11:35 +0200 |
| commit | 2956a3511c8c5dccb1d4739ead17c7c3c23a24b7 (patch) | |
| tree | 8d89ef507d10826f4f2556000fc8ea6566784ce1 /arch/x86/xen | |
| parent | 349c709f42453707f74bece0d9d35ee5b3842893 (diff) | |
xen: allow some cr4 updates
The guest can legitimately change things like cr4.OSFXSR and
OSXMMEXCPT, so let it.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/xen')
| -rw-r--r-- | arch/x86/xen/enlighten.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 35ddaf50180..f6876485ee7 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -648,8 +648,10 @@ static unsigned long xen_read_cr2_direct(void) 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) |