[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] x86/VT-x: Disable MSR intercept for SHADOW_GS_BASE.
At 14:02 +0000 on 14 Nov (1384434176), Andrew Cooper wrote: > Intercepting this MSR is pointless - The swapgs instruction does not cause a > vmexit, so the cached result of this is potentially stale after the next guest > instruction. It is correctly saved and restored on vcpu context switch. > > Furthermore, 64bit Windows writes to this MSR on every thread context switch, > so interception causes a substantial performance hit. > > From: Paul Durrant <paul.durrant@xxxxxxxxxx> > Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx> > Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Reviewed-by: Tim Deegan <tim@xxxxxxx> _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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