Re: [Xen-devel] [PATCH for 4.6] xen/arm: vgic: Correctly emulate write when byte is used

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Wed, 2015-09-23 at 14:23 +0100, Wei Liu wrote:
> On Tue, Sep 22, 2015 at 09:18:48PM +0100, Julien Grall wrote:
> > When a guest is writing a byte, the value will be located in bits[7:0]
> > of the register.
> > 
> > Although the current implementation is expecting the byte at the Nth
> > byte of the register where N = address & 4;
> > 
> > When the address is not 4-byte aligned, the corresponding byte in the
> > internal state will always be set to zero rather.
> > 
> > Note that byte access are only used for GICD_IPRIORITYR and
> > GICD_ITARGETSR. So the worst things that could happen is not setting
> > the
> > priority correctly and ignore the target vCPU written.
> > 
> > Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
> > 
> 
> Subject to an ack / review from ARM folks:
> 
> Release-acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>

Acked + applied to staging and staging-4.6, noted for later backport to 4.5
and 4.4.


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