From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Thu, 24 Jul 2008 20:48:58 +0000 (-0700)
Subject: xen: suppress known wrmsrs
X-Git-Tag: v2.6.28-rc1~699^2^2~39
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=d89961e2dc87b6e30b8e3f60bd2af5cd92cf4643;p=linux-2.6-omap-h63xx.git

xen: suppress known wrmsrs

In general, Xen doesn't support wrmsr from an unprivileged domain; it
just ends up ignoring the instruction and printing a message on the
console.

Given that there are sets of MSRs we know the kernel will try to write
to, but we don't care, just eat them in xen_write_msr to cut down on
console noise.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index b011e4a5dbb..b795470ec06 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -854,6 +854,19 @@ static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
 			ret = -EFAULT;
 		break;
 #endif
+
+	case MSR_STAR:
+	case MSR_CSTAR:
+	case MSR_LSTAR:
+	case MSR_SYSCALL_MASK:
+	case MSR_IA32_SYSENTER_CS:
+	case MSR_IA32_SYSENTER_ESP:
+	case MSR_IA32_SYSENTER_EIP:
+		/* Fast syscall setup is all done in hypercalls, so
+		   these are all ignored.  Stub them out here to stop
+		   Xen console noise. */
+		break;
+
 	default:
 		ret = native_write_msr_safe(msr, low, high);
 	}