[Xen-ia64-devel] RE: Interim vcpu_get_psr fix

["Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>]

Committed.  Good catch! 

> -----Original Message-----
> From: matthewc@xxxxxxxxxxxxxxx 
> [mailto:matthewc@xxxxxxxxxxxxxxx] On Behalf Of Chapman, 
> Matthew (HP Labs)
> Sent: Friday, November 18, 2005 2:44 AM
> To: Magenheimer, Dan (HP Labs Fort Collins)
> Cc: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Interim vcpu_get_psr fix
> 
> vcpu_get_psr previously read the current value of PSR within the
> hypervisor (mov =psr), which has many bits cleared compared to
> the guest PSR value.  For example, it always returned a PSR
> value with dfh cleared, which causes FP save/restore problems in
> Linux.  This patch changes it to use the IPSR instead of the
> current PSR value.
> 
> (I'm working on a more general patch to provide better PSR
> virtualisation - by tracking the virtual PSR in vpsr and merging
> only certain IPSR bits - but in the meantime this patch addresses
> the most serious bug.)
> 
> Matt
> 
> 

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