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From: Will Deacon <will@kernel.org>
To: Achin Gupta <Achin.Gupta@arm.com>
Cc: Rob Herring <robh@kernel.org>,
	Sudeep Holla <Sudeep.Holla@arm.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Marc Zyngier <maz@kernel.org>, nd <nd@arm.com>
Subject: Re: [RFC PATCH 1/3] dt-bindings: Add ARM PSA FF binding for non-secure VM partitions
Date: Thu, 11 Jun 2020 18:12:23 +0100	[thread overview]
Message-ID: <20200611171222.GB7725@willie-the-truck> (raw)
In-Reply-To: <5B3F18A4-5DA4-411E-9E26-7D25DEE3D414@arm.com>

On Thu, Jun 11, 2020 at 03:46:35PM +0000, Achin Gupta wrote:
> > On 10 Jun 2020, at 08:43, Will Deacon <will@kernel.org> wrote:
> > On Tue, Jun 09, 2020 at 04:35:51PM -0600, Rob Herring wrote:
> >> On Mon, Jun 01, 2020 at 10:45:10AM +0100, Sudeep Holla wrote:
> >>> Add devicetree bindings for a Arm PSA FF-A compliant non-secure partition
> >>> at virtual interface(VMs).
> >>> 
> >>> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> >>> ---
> >>> .../devicetree/bindings/arm/arm,psa-ffa.txt   | 47 +++++++++++++++++++
> >>> 1 file changed, 47 insertions(+)
> >>> create mode 100644 Documentation/devicetree/bindings/arm/arm,psa-ffa.txt
> >> 
> >> I'm hoping this goes away if the firmware is discoverable, but if not DT 
> >> bindings are DT schema now.
> > 
> > We'll need the binding for the kvm host side, because there are plenty
> > of partition properties that are not discoverable (e.g. number of vCPUs).
> 
> Just trying to understand the req. a bit better…
> 
> The FF-A driver in the host can use FFA_PARTITION_INFO_GET to determine
> the count of partitions and their vCPUs.
> 
> Is this about a guest being able to find out how many vCPUs it has? 

This is about KVM finding out the information it needs in order to spawn
non-secure partitions. I don't see how it can do that with
FFA_PARTITION_INFO_GET -- who would respond?

But you're right that number of vCPUs was a bad example. We also need
information such as the entry point.

Will

WARNING: multiple messages have this Message-ID (diff)
From: Will Deacon <will@kernel.org>
To: Achin Gupta <Achin.Gupta@arm.com>
Cc: Rob Herring <robh@kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	Marc Zyngier <maz@kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Sudeep Holla <Sudeep.Holla@arm.com>, nd <nd@arm.com>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC PATCH 1/3] dt-bindings: Add ARM PSA FF binding for non-secure VM partitions
Date: Thu, 11 Jun 2020 18:12:23 +0100	[thread overview]
Message-ID: <20200611171222.GB7725@willie-the-truck> (raw)
In-Reply-To: <5B3F18A4-5DA4-411E-9E26-7D25DEE3D414@arm.com>

On Thu, Jun 11, 2020 at 03:46:35PM +0000, Achin Gupta wrote:
> > On 10 Jun 2020, at 08:43, Will Deacon <will@kernel.org> wrote:
> > On Tue, Jun 09, 2020 at 04:35:51PM -0600, Rob Herring wrote:
> >> On Mon, Jun 01, 2020 at 10:45:10AM +0100, Sudeep Holla wrote:
> >>> Add devicetree bindings for a Arm PSA FF-A compliant non-secure partition
> >>> at virtual interface(VMs).
> >>> 
> >>> Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
> >>> ---
> >>> .../devicetree/bindings/arm/arm,psa-ffa.txt   | 47 +++++++++++++++++++
> >>> 1 file changed, 47 insertions(+)
> >>> create mode 100644 Documentation/devicetree/bindings/arm/arm,psa-ffa.txt
> >> 
> >> I'm hoping this goes away if the firmware is discoverable, but if not DT 
> >> bindings are DT schema now.
> > 
> > We'll need the binding for the kvm host side, because there are plenty
> > of partition properties that are not discoverable (e.g. number of vCPUs).
> 
> Just trying to understand the req. a bit better…
> 
> The FF-A driver in the host can use FFA_PARTITION_INFO_GET to determine
> the count of partitions and their vCPUs.
> 
> Is this about a guest being able to find out how many vCPUs it has? 

This is about KVM finding out the information it needs in order to spawn
non-secure partitions. I don't see how it can do that with
FFA_PARTITION_INFO_GET -- who would respond?

But you're right that number of vCPUs was a bad example. We also need
information such as the entry point.

Will

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  reply	other threads:[~2020-06-11 17:12 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-01  9:45 [RFC PATCH 0/3] firmware: Add support for PSA FF-A interface Sudeep Holla
2020-06-01  9:45 ` Sudeep Holla
2020-06-01  9:45 ` [RFC PATCH 1/3] dt-bindings: Add ARM PSA FF binding for non-secure VM partitions Sudeep Holla
2020-06-01  9:45   ` Sudeep Holla
2020-06-09 22:35   ` Rob Herring
2020-06-09 22:35     ` Rob Herring
2020-06-10  7:43     ` Will Deacon
2020-06-10  7:43       ` Will Deacon
2020-06-10 13:56       ` Rob Herring
2020-06-10 13:56         ` Rob Herring
2020-06-11 15:46       ` Achin Gupta
2020-06-11 15:46         ` Achin Gupta
2020-06-11 17:12         ` Will Deacon [this message]
2020-06-11 17:12           ` Will Deacon
2020-06-15  9:16           ` Achin Gupta
2020-06-15  9:16             ` Achin Gupta
2020-06-15  9:51             ` Will Deacon
2020-06-15  9:51               ` Will Deacon
2020-06-15 11:42               ` Achin Gupta
2020-06-15 11:42                 ` Achin Gupta
2020-06-15 11:55                 ` Will Deacon
2020-06-15 11:55                   ` Will Deacon
2020-06-15 16:48                   ` Achin Gupta
2020-06-15 16:48                     ` Achin Gupta
2020-06-10  8:32     ` Sudeep Holla
2020-06-10  8:32       ` Sudeep Holla
2020-06-01  9:45 ` [RFC PATCH 2/3] firmware: Add support for PSA FF-A transport for " Sudeep Holla
2020-06-01  9:45   ` Sudeep Holla
2020-06-01 13:46   ` kbuild test robot
2020-06-02  7:11   ` kbuild test robot
2020-07-09 22:15   ` Arve Hjønnevåg
2020-07-09 22:15     ` Arve Hjønnevåg
2020-06-01  9:45 ` [RFC PATCH 3/3] firmware: Add example PSA FF-A non-secure VM partition Sudeep Holla
2020-06-01  9:45   ` Sudeep Holla
2020-06-01 14:22   ` kbuild test robot
2020-06-04 13:37 ` [RFC PATCH 0/3] firmware: Add support for PSA FF-A interface Will Deacon
2020-06-04 13:37   ` Will Deacon
2020-06-09 17:41   ` Sudeep Holla
2020-06-09 17:41     ` Sudeep Holla
2020-06-10  7:57     ` Will Deacon
2020-06-10  7:57       ` Will Deacon
2020-06-10  8:10       ` Sudeep Holla
2020-06-10  8:10         ` Sudeep Holla
2020-06-15 11:38     ` Jens Wiklander
2020-06-15 11:38       ` Jens Wiklander

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