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Message-ID: <4888EABA.1030608@goop.org> Date: Thu, 24 Jul 2008 13:48:58 -0700 From: Jeremy Fitzhardinge <jeremy@...p.org> To: Ingo Molnar <mingo@...e.hu> CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: [PATCH] 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@...rix.com> --- arch/x86/xen/enlighten.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) =================================================================== --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -803,6 +803,19 @@ 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); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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