Re: [Xen-devel] [PATCH] x86/hvm: Don't let hvm_set_efer() raise #GP behind the emulators back

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 24.02.17 at 11:59, <andrew.cooper3@xxxxxxxxxx> wrote:
> c/s 49de10f3c "x86/hvm: Don't raise #GP behind the emulators back for MSR
> accesses" missed an edge case.
> 
> hvm_set_efer() raises #GP itself, so deliberately avoided the goto gp_fault
> path in hvm_msr_write_intercept().
> 
> With the above change, guest updates to MSR_EFER which end up faulting raises
> hvm_msr_write_intercept() returning X86EMUL_EXCEPTION.  The second #GP gets
> combined to #DF and handed back to the guest.
> 
> Update hvm_set_efer() to avoid raising #GP, requiring its callers to do so.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>



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