From d89961e2dc87b6e30b8e3f60bd2af5cd92cf4643 Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Thu, 24 Jul 2008 13:48:58 -0700 Subject: 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 Signed-off-by: Ingo Molnar --- arch/x86/xen/enlighten.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'arch/x86/xen') 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); } -- cgit v1.2.3-18-g5258