linux-kernel - Re: [PATCH v2 3/4] KVM: arm64: Fix the identification range for the FF-A smcs

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Date: Wed, 12 Jun 2024 15:38:26 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: Sebastian Ene <sebastianene@...gle.com>
Cc: catalin.marinas@....com, james.morse@....com, jean-philippe@...aro.org,
	Sudeep Holla <sudeep.holla@....com>, maz@...nel.org,
	oliver.upton@...ux.dev, qperret@...gle.com, qwandor@...gle.com,
	suzuki.poulose@....com, tabba@...gle.com, will@...nel.org,
	yuzenghui@...wei.com, lpieralisi@...nel.org, kvmarm@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kernel-team@...roid.com
Subject: Re: [PATCH v2 3/4] KVM: arm64: Fix the identification range for the
 FF-A smcs

On Wed, May 15, 2024 at 05:22:57PM +0000, Sebastian Ene wrote:
> The FF-A spec 1.2 reserves the following ranges for identifying FF-A
> calls:
> 0x84000060-0x840000FF: FF-A 32-bit calls
> 0xC4000060-0xC40000FF: FF-A 64-bit calls.
>
> Use the range identification according to the spec and allow calls that
> are currently out of the range(eg. FFA_MSG_SEND_DIRECT_REQ2) to be
> identified correctly.
>

Reviewed-by: Sudeep Holla <sudeep.holla@....com>

Not sure if this needs to be fixes though. With addition of notifications
in the FF-A driver(since v6.7), host can send FF-A messages beyond 0x7F.
But since the pKVM FF-A proxy support is not yet updated to v1.1, so I
don't think it needs to be tagged as fix. Just thought I will mention it
here anyways.

--
Regards,
Sudeep