Re: [Xen-devel] [RFC 0/2] xen/arm: vgic: Support 32-bit access for 64-bit register

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 04/08/15 12:59, Julien Grall wrote:
> Hi all,

Hi,

Any more comments on this series before I send a new version?

Regards,

> This series aims to fix the 32-bit access on 64-bit register. Some guest
> OS such as FreeBSD and Linux (only in the ITS) use those access and will
> crash when starting on Xen.
> 
> The first patch introduces generic helpers to read/write/clear/set a register.
> While the second is the main purpose of this series.
> 
> I'd like to go a bit further in the clean up, hence the RFC. But I wanted them
> out in order to help Vijay supporting any access quickly for his ITS series.
> 
> TODO:
>     - use the new helpers in vGICv2
>     - support signed extension generically
>     - see what assembly is generated on 32-bit with the uint64_t cast.
>     It may be possible to optimize it a bit by avoid uint64_t. Although I'm
>     not sure if it's worth it.
> 
> Sincerely yours,
> 
> Julien Grall (2):
>   xen/arm: vgic: Introduce helpers to read/write/clear/set vGIC register
>     ...
>   xen/arm: vgic-v3: Support 32-bit access for 64-bit registers
> 
>  xen/arch/arm/vgic-v3.c     | 126 
> +++++++++++++++++++++++++++++----------------
>  xen/include/asm-arm/vgic.h | 104 +++++++++++++++++++++++++++++++++++++
>  2 files changed, 187 insertions(+), 43 deletions(-)
> 


-- 
Julien Grall

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