Re: [Qemu-devel] [PATCH 3/7] target-arm: mark up cpregs for no-migrate or raw access

[Christoffer Dall <christoffer.dall@linaro.org>]

On Fri, May 17, 2013 at 02:23:53PM +0100, Peter Maydell wrote:
> Mark up coprocessor register definitions to add raw access
> functions or mark the register as non-migratable where necessary.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>  target-arm/helper.c |   94 ++++++++++++++++++++++++++++++++++-----------------
>  1 file changed, 63 insertions(+), 31 deletions(-)
> 
> diff --git a/target-arm/helper.c b/target-arm/helper.c
> index 2585d59..e5e4ed2 100644
> --- a/target-arm/helper.c
> +++ b/target-arm/helper.c
> @@ -155,13 +155,17 @@ static const ARMCPRegInfo cp_reginfo[] = {
>       * the unified TLB ops but also the dside/iside/inner-shareable variants.
>       */
>      { .name = "TLBIALL", .cp = 15, .crn = 8, .crm = CP_ANY,
> -      .opc1 = CP_ANY, .opc2 = 0, .access = PL1_W, .writefn = tlbiall_write, },
> +      .opc1 = CP_ANY, .opc2 = 0, .access = PL1_W, .writefn = tlbiall_write,
> +      .type = ARM_CP_NO_MIGRATE },

[...]

What happens with registers which don't have the raw_write function set
(even though the write function imposes some access checks or has side
effects) and also is not marked as ARM_CP_NO_MIGRATE, CONTEXTIDR seems
to be such an example. ?

-Christoffer