Messages in this thread Patch in this message | | | Subject | [PATCH 4 of 5] xen: allow some cr4 updates | Date | Fri, 23 May 2008 14:10:57 +0100 | From | Jeremy Fitzhardinge <> |
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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)
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