Re: [PATCH v19 1/7] firmware: arm_rmm: Add SMC definitions for calling the RMM

[Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>]

On Thu, 24 Sep 2026 14:51:55 +0100
Suzuki K Poulose <suzuki.poulose@arm.com> wrote:

> From: Steven Price <steven.price@arm.com>
> 
> The RMM (Realm Management Monitor) provides functionality that can be
> accessed by SMC calls from the host.
> 
> The SMC definitions are based on DEN0137[1] version 2.0-bet3
> 
> [1] https://developer.arm.com/documentation/den0137/2-0bet3/
> 
> Reviewed-by: Gavin Shan <gshan@redhat.com>
> Signed-off-by: Steven Price <steven.price@arm.com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>

Hi Suzuki,

One small thing I didn't really care about but where I thought you
said you were going to tweak things.

Either way
Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>

> +struct rec_exit {
> +	union { /* 0x000 */
> +		u8 exit_reason;
> +		u8 padding0[0x100];
> +	};
> +	union { /* 0x100 */
> +		struct {
> +			u64 esr;
> +			u64 far;
> +			u64 hpfar;
> +			u64 rtt_tree;
> +		};
> +		u8 padding1[0x100];
> +	};
> +	union { /* 0x200 */
> +		u64 gprs[REC_RUN_GPRS];
> +		u8 padding2[0x100];
> +	};
> +	union { /* 0x300 */
> +		u8 padding3[0x100];

I thought plan was to fold into the padding above?

https://lore.kernel.org/all/d7ccaf22-5bde-4344-8bf0-a5a17dcac0f3@arm.com/

> +	};
> +	union { /* 0x400 */
> +		struct {
> +			u64 cntp_ctl;
> +			u64 cntp_cval;
> +			u64 cntv_ctl;
> +			u64 cntv_cval;
> +		};
> +		u8 padding4[0x100];
> +	};