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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-07-24 13:48:58 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-28 16:33:08 +0200 |
| commit | d89961e2dc87b6e30b8e3f60bd2af5cd92cf4643 (patch) | |
| tree | 63b6192ad4bf4a74edbcea6ab4540789f148b60b /arch/x86/xen/enlighten.c | |
| parent | fde28e8f49ed86e771667a3fe81fcc25c93ede8e (diff) | |
| download | blackbird-op-linux-d89961e2dc87b6e30b8e3f60bd2af5cd92cf4643.tar.gz blackbird-op-linux-d89961e2dc87b6e30b8e3f60bd2af5cd92cf4643.zip | |
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>
Diffstat (limited to 'arch/x86/xen/enlighten.c')
| -rw-r--r-- | arch/x86/xen/enlighten.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index b011e4a5dbbe..b795470ec069 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); } |
