Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit d89961e2 authored by Jeremy Fitzhardinge's avatar Jeremy Fitzhardinge Committed by Ingo Molnar
Browse files

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: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent fde28e8f

arch/x86/xen/enlighten.c

+13 −0
Original line number Original line Diff line number Diff line
@@ -854,6 +854,19 @@ static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high) 
			ret = -EFAULT;

			ret = -EFAULT;

		break;

		break;

#endif

#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:

	default:

		ret = native_write_msr_safe(msr, low, high);

		ret = native_write_msr_safe(msr, low, high);

	}

	}