From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH 4 of 5] xen: allow some cr4 updates
Date: Fri, 23 May 2008 14:10:57 +0100 [thread overview]
Message-ID: <f0c894b6eba80461ec48.1211548257@localhost> (raw)
In-Reply-To: <patchbomb.1211548253@localhost>
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)
next prev parent reply other threads:[~2008-05-23 13:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-23 13:10 [PATCH 0 of 5] xen+x86: misc fixes Jeremy Fitzhardinge
2008-05-23 13:10 ` [PATCH 1 of 5] xen: use hypercall rather than clts Jeremy Fitzhardinge
2008-05-23 13:10 ` [PATCH 2 of 5] xen: use new sched_op Jeremy Fitzhardinge
2008-05-23 13:10 ` [PATCH 3 of 5] x86: use symbolic constant in stts() Jeremy Fitzhardinge
2008-05-23 13:10 ` Jeremy Fitzhardinge [this message]
2008-05-23 13:10 ` [PATCH 5 of 5] xen: don't worry about preempt during xen_irq_enable() Jeremy Fitzhardinge
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