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>
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@ -648,8 +648,10 @@ static unsigned long xen_read_cr2_direct(void)
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static void xen_write_cr4(unsigned long cr4)
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{
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/* Just ignore cr4 changes; Xen doesn't allow us to do
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anything anyway. */
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cr4 &= ~X86_CR4_PGE;
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cr4 &= ~X86_CR4_PSE;
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native_write_cr4(cr4);
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}
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static unsigned long xen_read_cr3(void)
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