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

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Message-ID: <78f841f1-1e1a-9eb9-940d-6e11dd18d86f@linaro.org>
Date:   Tue, 21 Feb 2023 07:50:46 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Elliot Berman <quic_eberman@...cinc.com>,
        Alex Elder <elder@...aro.org>,
        Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>
Cc:     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>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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 14/02/2023 21:23, 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;
> +} __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;
> +#define GH_RM_VM_STOP_REASON_FORCE_STOP		3
> +	__le32 stop_reason;
> +} __packed;
> +
> +/* Call: VM_CONFIG_IMAGE */
> +struct gh_rm_vm_config_image_req {
> +	__le16 vmid;
> +	__le16 auth_mech;
> +	__le32 mem_handle;
> +	__le64 image_offset;
> +	__le64 image_size;
> +	__le64 dtb_offset;
> +	__le64 dtb_size;
> +} __packed;
> +
> +/* Call: GET_HYP_RESOURCES */
> +
-------------------------------->

All the above structures are very much internal to rsc_mgr_rpc.c and 
interface to the rsc_mgr_rpc is already abstracted with function arguments

ex:

int gh_rm_vm_configure(struct gh_rm *rm, u16 vmid, enum 
gh_rm_vm_auth_mechanism auth_mechanism, u32 mem_handle, u64 
image_offset, u64 image_size, u64 dtb_offset, u64 dtb_size)

So why do we need these structs and defines in header file at all?
you should proabably consider moving them to the .c file.


>   #endif
> diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c
> new file mode 100644
> index 000000000000..4515cdd80106
> --- /dev/null
> +++ b/drivers/virt/gunyah/rsc_mgr_rpc.c
> @@ -0,0 +1,226 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include <linux/gunyah_rsc_mgr.h>
> +

Why new line here?

> +#include "rsc_mgr.h"
> +
> +/*
...

> +int gh_rm_vm_configure(struct gh_rm *rm, u16 vmid, enum gh_rm_vm_auth_mechanism auth_mechanism,
> +		u32 mem_handle, u64 image_offset, u64 image_size, u64 dtb_offset, u64 dtb_size)
> +{
> +	struct gh_rm_vm_config_image_req req_payload = { 0 };
> +	size_t resp_size;
> +	void *resp;
> +
> +	req_payload.vmid = cpu_to_le16(vmid);
> +	req_payload.auth_mech = cpu_to_le16(auth_mechanism);
> +	req_payload.mem_handle = cpu_to_le32(mem_handle);
> +	req_payload.image_offset = cpu_to_le64(image_offset);
> +	req_payload.image_size = cpu_to_le64(image_size);
> +	req_payload.dtb_offset = cpu_to_le64(dtb_offset);
> +	req_payload.dtb_size = cpu_to_le64(dtb_size);
> +
> +	return gh_rm_call(rm, GH_RM_RPC_VM_CONFIG_IMAGE, &req_payload, sizeof(req_payload),
> +			&resp, &resp_size);
> +}
> +

--srini