[Qemu-devel] Re: [PATCH] enable SVM EFER bit

[Alexander Graf <agraf@suse.de>]

On Jun 4, 2008, at 3:02 PM, Fabrice Bellard wrote:

> Alexander Graf wrote:
>> Due to the recently introduces checks for SVM activation, the SVM  
>> instructions currently throw a #UD exception if they are not  
>> activated. The activation happens through a write to the EFER which  
>> does not support the SVM bit yet.
>> This patch adds the SVME bit to the EFER MSR write. It makes KVM  
>> work for me again.
>
> OK for the problem, but the fix is not OK because you don't  
> synchronize the hflags. It is strange that SVM can even work with  
> that... I am working on a better fix.

a write to MSR_EFER calls cpu_load_efer() which updates the hflags.

Alex