linux-kernel - Re: [PATCH v10 09/26] gunyah: rsc

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Date:   Thu, 16 Feb 2023 07:39:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Elliot Berman <quic_eberman@...cinc.com>
Cc:     Alex Elder <elder@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
        Murali Nalajala <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>,
        Carl van Schaik <quic_cvanscha@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Jassi Brar <jassisinghbrar@...il.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v10 09/26] gunyah: rsc_mgr: Add VM lifecycle RPC

On Tue, Feb 14, 2023 at 01:23:42PM -0800, Elliot Berman wrote:
> 
> Add Gunyah Resource Manager RPC to launch an unauthenticated VM.
> 
> Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
> ---
>  drivers/virt/gunyah/Makefile      |   2 +-
>  drivers/virt/gunyah/rsc_mgr.h     |  45 ++++++
>  drivers/virt/gunyah/rsc_mgr_rpc.c | 226 ++++++++++++++++++++++++++++++
>  include/linux/gunyah_rsc_mgr.h    |  73 ++++++++++
>  4 files changed, 345 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/virt/gunyah/rsc_mgr_rpc.c
> 
> diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile
> index cc864ff5abbb..de29769f2f3f 100644
> --- a/drivers/virt/gunyah/Makefile
> +++ b/drivers/virt/gunyah/Makefile
> @@ -2,5 +2,5 @@
>  
>  obj-$(CONFIG_GUNYAH) += gunyah.o
>  
> -gunyah_rsc_mgr-y += rsc_mgr.o
> +gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o
>  obj-$(CONFIG_GUNYAH) += gunyah_rsc_mgr.o
> diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h
> index d4e799a7526f..7406237bc66d 100644
> --- a/drivers/virt/gunyah/rsc_mgr.h
> +++ b/drivers/virt/gunyah/rsc_mgr.h
> @@ -74,4 +74,49 @@ struct gh_rm;
>  int gh_rm_call(struct gh_rm *rsc_mgr, u32 message_id, void *req_buff, size_t req_buff_size,
>  		void **resp_buf, size_t *resp_buff_size);
>  
> +/* Message IDs: VM Management */
> +#define GH_RM_RPC_VM_ALLOC_VMID			0x56000001
> +#define GH_RM_RPC_VM_DEALLOC_VMID		0x56000002
> +#define GH_RM_RPC_VM_START			0x56000004
> +#define GH_RM_RPC_VM_STOP			0x56000005
> +#define GH_RM_RPC_VM_RESET			0x56000006
> +#define GH_RM_RPC_VM_CONFIG_IMAGE		0x56000009
> +#define GH_RM_RPC_VM_INIT			0x5600000B
> +#define GH_RM_RPC_VM_GET_HYP_RESOURCES		0x56000020
> +#define GH_RM_RPC_VM_GET_VMID			0x56000024
> +
> +struct gh_rm_vm_common_vmid_req {
> +	__le16 vmid;
> +	__le16 reserved0;

reserved for what?  What is a valid value for this field?  Should it be
checked for 0?

Same with other "reserved0" fields in this file.


> +} __packed;
> +
> +/* Call: VM_ALLOC */
> +struct gh_rm_vm_alloc_vmid_resp {
> +	__le16 vmid;
> +	__le16 reserved0;
> +} __packed;
> +
> +/* Call: VM_STOP */
> +struct gh_rm_vm_stop_req {
> +	__le16 vmid;
> +#define GH_RM_VM_STOP_FLAG_FORCE_STOP	BIT(0)
> +	u8 flags;
> +	u8 reserved;

Why just "reserved" and not "reserved0"?  Naming is hard :(

thanks,

greg k-h