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