Re: [Xen-merge] write_cr{0,4}

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> 23.12.05 12:39:45 >>>
>Writes to cr0 already are emulated -- the TS bit is virtualised and
all 
>other modified bits are ignored. We could also emulate (ignore) writes

>to cr4, if that avoids xen-specific changes in the guest. The change
to 
>do this is utterly trivial. Reads of cr4 are already emulated.

Yes, I saw this. However, I wouldn't name this emulation. If, as in the
examples given, the writes are for a purpose where throwing away the
data isn't appropriate, I'd rather see this reported than silently
ignored. At least the TSC-disabling case is clearly a security issue.

Jan

_______________________________________________
Xen-merge mailing list
Xen-merge@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-merge