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Message-ID: <b88d096b-7714-d06c-0daf-41c35885369a@linaro.org>
Date:   Tue, 6 Jun 2023 13:49:36 +0100
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Subject: Re: [PATCH v13 07/24] gunyah: rsc_mgr: Add VM lifecycle RPC
Content-Language: en-US
To:     Elliot Berman <quic_eberman@quicinc.com>,
        Alex Elder <elder@linaro.org>,
        Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>
Cc:     Murali Nalajala <quic_mnalajal@quicinc.com>,
        Trilok Soni <quic_tsoni@quicinc.com>,
        Srivatsa Vaddagiri <quic_svaddagi@quicinc.com>,
        Carl van Schaik <quic_cvanscha@quicinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Bagas Sanjaya <bagasdotme@gmail.com>,
        Will Deacon <will@kernel.org>, Andy Gross <agross@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Jassi Brar <jassisinghbrar@gmail.com>,
        linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org
References: <20230509204801.2824351-1-quic_eberman@quicinc.com>
 <20230509204801.2824351-8-quic_eberman@quicinc.com>
From:   Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
In-Reply-To: <20230509204801.2824351-8-quic_eberman@quicinc.com>
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On 09/05/2023 21:47, Elliot Berman wrote:
> Add Gunyah Resource Manager RPC to launch an unauthenticated VM.
> 
> Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
> ---


Reviewed-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

--srini


>   drivers/virt/gunyah/Makefile      |   2 +-
>   drivers/virt/gunyah/rsc_mgr_rpc.c | 259 ++++++++++++++++++++++++++++++
>   include/linux/gunyah_rsc_mgr.h    |  73 +++++++++
>   3 files changed, 333 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 0f5aec834698..241bab357b86 100644
> --- a/drivers/virt/gunyah/Makefile
> +++ b/drivers/virt/gunyah/Makefile
> @@ -1,4 +1,4 @@
>   # SPDX-License-Identifier: GPL-2.0
>   
> -gunyah-y += rsc_mgr.o
> +gunyah-y += rsc_mgr.o rsc_mgr_rpc.o
>   obj-$(CONFIG_GUNYAH) += gunyah.o
> diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c
> new file mode 100644
> index 000000000000..a4a9f0ba4e1f
> --- /dev/null
> +++ b/drivers/virt/gunyah/rsc_mgr_rpc.c
> @@ -0,0 +1,259 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include <linux/gunyah_rsc_mgr.h>
> +#include "rsc_mgr.h"
> +
> +/* 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 _padding;
> +} __packed;
> +
> +/* Call: VM_ALLOC */
> +struct gh_rm_vm_alloc_vmid_resp {
> +	__le16 vmid;
> +	__le16 _padding;
> +} __packed;
> +
> +/* Call: VM_STOP */
> +#define GH_RM_VM_STOP_FLAG_FORCE_STOP		BIT(0)
> +
> +#define GH_RM_VM_STOP_REASON_FORCE_STOP		3
> +
> +struct gh_rm_vm_stop_req {
> +	__le16 vmid;
> +	u8 flags;
> +	u8 _padding;
> +	__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;
> +
> +/*
> + * Several RM calls take only a VMID as a parameter and give only standard
> + * response back. Deduplicate boilerplate code by using this common call.
> + */
> +static int gh_rm_common_vmid_call(struct gh_rm *rm, u32 message_id, u16 vmid)
> +{
> +	struct gh_rm_vm_common_vmid_req req_payload = {
> +		.vmid = cpu_to_le16(vmid),
> +	};
> +
> +	return gh_rm_call(rm, message_id, &req_payload, sizeof(req_payload), NULL, NULL);
> +}
> +
> +/**
> + * gh_rm_alloc_vmid() - Allocate a new VM in Gunyah. Returns the VM identifier.
> + * @rm: Handle to a Gunyah resource manager
> + * @vmid: Use 0 to dynamically allocate a VM. A reserved VMID can be supplied
> + *        to request allocation of a platform-defined VM.
> + *
> + * Returns - the allocated VMID or negative value on error
> + */
> +int gh_rm_alloc_vmid(struct gh_rm *rm, u16 vmid)
> +{
> +	struct gh_rm_vm_common_vmid_req req_payload = {
> +		.vmid = cpu_to_le16(vmid),
> +	};
> +	struct gh_rm_vm_alloc_vmid_resp *resp_payload;
> +	size_t resp_size;
> +	void *resp;
> +	int ret;
> +
> +	ret = gh_rm_call(rm, GH_RM_RPC_VM_ALLOC_VMID, &req_payload, sizeof(req_payload), &resp,
> +			&resp_size);
> +	if (ret)
> +		return ret;
> +
> +	if (!vmid) {
> +		resp_payload = resp;
> +		ret = le16_to_cpu(resp_payload->vmid);
> +		kfree(resp);
> +	}
> +
> +	return ret;
> +}
> +
> +/**
> + * gh_rm_dealloc_vmid() - Dispose of a VMID
> + * @rm: Handle to a Gunyah resource manager
> + * @vmid: VM identifier allocated with gh_rm_alloc_vmid
> + */
> +int gh_rm_dealloc_vmid(struct gh_rm *rm, u16 vmid)
> +{
> +	return gh_rm_common_vmid_call(rm, GH_RM_RPC_VM_DEALLOC_VMID, vmid);
> +}
> +
> +/**
> + * gh_rm_vm_reset() - Reset a VM's resources
> + * @rm: Handle to a Gunyah resource manager
> + * @vmid: VM identifier allocated with gh_rm_alloc_vmid
> + *
> + * As part of tearing down the VM, request RM to clean up all the VM resources
> + * associated with the VM. Only after this, Linux can clean up all the
> + * references it maintains to resources.
> + */
> +int gh_rm_vm_reset(struct gh_rm *rm, u16 vmid)
> +{
> +	return gh_rm_common_vmid_call(rm, GH_RM_RPC_VM_RESET, vmid);
> +}
> +
> +/**
> + * gh_rm_vm_start() - Move a VM into "ready to run" state
> + * @rm: Handle to a Gunyah resource manager
> + * @vmid: VM identifier allocated with gh_rm_alloc_vmid
> + *
> + * On VMs which use proxy scheduling, vcpu_run is needed to actually run the VM.
> + * On VMs which use Gunyah's scheduling, the vCPUs start executing in accordance with Gunyah
> + * scheduling policies.
> + */
> +int gh_rm_vm_start(struct gh_rm *rm, u16 vmid)
> +{
> +	return gh_rm_common_vmid_call(rm, GH_RM_RPC_VM_START, vmid);
> +}
> +
> +/**
> + * gh_rm_vm_stop() - Send a request to Resource Manager VM to forcibly stop a VM.
> + * @rm: Handle to a Gunyah resource manager
> + * @vmid: VM identifier allocated with gh_rm_alloc_vmid
> + */
> +int gh_rm_vm_stop(struct gh_rm *rm, u16 vmid)
> +{
> +	struct gh_rm_vm_stop_req req_payload = {
> +		.vmid = cpu_to_le16(vmid),
> +		.flags = GH_RM_VM_STOP_FLAG_FORCE_STOP,
> +		.stop_reason = cpu_to_le32(GH_RM_VM_STOP_REASON_FORCE_STOP),
> +	};
> +
> +	return gh_rm_call(rm, GH_RM_RPC_VM_STOP, &req_payload, sizeof(req_payload), NULL, NULL);
> +}
> +
> +/**
> + * gh_rm_vm_configure() - Prepare a VM to start and provide the common
> + *			  configuration needed by RM to configure a VM
> + * @rm: Handle to a Gunyah resource manager
> + * @vmid: VM identifier allocated with gh_rm_alloc_vmid
> + * @auth_mechanism: Authentication mechanism used by resource manager to verify
> + *                  the virtual machine
> + * @mem_handle: Handle to a previously shared memparcel that contains all parts
> + *              of the VM image subject to authentication.
> + * @image_offset: Start address of VM image, relative to the start of memparcel
> + * @image_size: Size of the VM image
> + * @dtb_offset: Start address of the devicetree binary with VM configuration,
> + *              relative to start of memparcel.
> + * @dtb_size: Maximum size of devicetree binary.
> + */
> +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 = {
> +		.vmid = cpu_to_le16(vmid),
> +		.auth_mech = cpu_to_le16(auth_mechanism),
> +		.mem_handle = cpu_to_le32(mem_handle),
> +		.image_offset = cpu_to_le64(image_offset),
> +		.image_size = cpu_to_le64(image_size),
> +		.dtb_offset = cpu_to_le64(dtb_offset),
> +		.dtb_size = cpu_to_le64(dtb_size),
> +	};
> +
> +	return gh_rm_call(rm, GH_RM_RPC_VM_CONFIG_IMAGE, &req_payload, sizeof(req_payload),
> +			  NULL, NULL);
> +}
> +
> +/**
> + * gh_rm_vm_init() - Move the VM to initialized state.
> + * @rm: Handle to a Gunyah resource manager
> + * @vmid: VM identifier
> + *
> + * RM will allocate needed resources for the VM.
> + */
> +int gh_rm_vm_init(struct gh_rm *rm, u16 vmid)
> +{
> +	return gh_rm_common_vmid_call(rm, GH_RM_RPC_VM_INIT, vmid);
> +}
> +
> +/**
> + * gh_rm_get_hyp_resources() - Retrieve hypervisor resources (capabilities) associated with a VM
> + * @rm: Handle to a Gunyah resource manager
> + * @vmid: VMID of the other VM to get the resources of
> + * @resources: Set by gh_rm_get_hyp_resources and contains the returned hypervisor resources.
> + *             Caller must free the resources pointer if successful.
> + */
> +int gh_rm_get_hyp_resources(struct gh_rm *rm, u16 vmid,
> +				struct gh_rm_hyp_resources **resources)
> +{
> +	struct gh_rm_vm_common_vmid_req req_payload = {
> +		.vmid = cpu_to_le16(vmid),
> +	};
> +	struct gh_rm_hyp_resources *resp;
> +	size_t resp_size;
> +	int ret;
> +
> +	ret = gh_rm_call(rm, GH_RM_RPC_VM_GET_HYP_RESOURCES,
> +			 &req_payload, sizeof(req_payload),
> +			 (void **)&resp, &resp_size);
> +	if (ret)
> +		return ret;
> +
> +	if (!resp_size)
> +		return -EBADMSG;
> +
> +	if (resp_size < struct_size(resp, entries, 0) ||
> +		resp_size != struct_size(resp, entries, le32_to_cpu(resp->n_entries))) {
> +		kfree(resp);
> +		return -EBADMSG;
> +	}
> +
> +	*resources = resp;
> +	return 0;
> +}
> +
> +/**
> + * gh_rm_get_vmid() - Retrieve VMID of this virtual machine
> + * @rm: Handle to a Gunyah resource manager
> + * @vmid: Filled with the VMID of this VM
> + */
> +int gh_rm_get_vmid(struct gh_rm *rm, u16 *vmid)
> +{
> +	static u16 cached_vmid = GH_VMID_INVAL;
> +	size_t resp_size;
> +	__le32 *resp;
> +	int ret;
> +
> +	if (cached_vmid != GH_VMID_INVAL) {
> +		*vmid = cached_vmid;
> +		return 0;
> +	}
> +
> +	ret = gh_rm_call(rm, GH_RM_RPC_VM_GET_VMID, NULL, 0, (void **)&resp, &resp_size);
> +	if (ret)
> +		return ret;
> +
> +	*vmid = cached_vmid = lower_16_bits(le32_to_cpu(*resp));
> +	kfree(resp);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(gh_rm_get_vmid);
> diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h
> index f2a312e80af5..1ac66d9004d2 100644
> --- a/include/linux/gunyah_rsc_mgr.h
> +++ b/include/linux/gunyah_rsc_mgr.h
> @@ -18,4 +18,77 @@ int gh_rm_notifier_unregister(struct gh_rm *rm, struct notifier_block *nb);
>   struct device *gh_rm_get(struct gh_rm *rm);
>   void gh_rm_put(struct gh_rm *rm);
>   
> +struct gh_rm_vm_exited_payload {
> +	__le16 vmid;
> +	__le16 exit_type;
> +	__le32 exit_reason_size;
> +	u8 exit_reason[];
> +} __packed;
> +
> +#define GH_RM_NOTIFICATION_VM_EXITED		 0x56100001
> +
> +enum gh_rm_vm_status {
> +	GH_RM_VM_STATUS_NO_STATE	= 0,
> +	GH_RM_VM_STATUS_INIT		= 1,
> +	GH_RM_VM_STATUS_READY		= 2,
> +	GH_RM_VM_STATUS_RUNNING		= 3,
> +	GH_RM_VM_STATUS_PAUSED		= 4,
> +	GH_RM_VM_STATUS_LOAD		= 5,
> +	GH_RM_VM_STATUS_AUTH		= 6,
> +	GH_RM_VM_STATUS_INIT_FAILED	= 8,
> +	GH_RM_VM_STATUS_EXITED		= 9,
> +	GH_RM_VM_STATUS_RESETTING	= 10,
> +	GH_RM_VM_STATUS_RESET		= 11,
> +};
> +
> +struct gh_rm_vm_status_payload {
> +	__le16 vmid;
> +	u16 reserved;
> +	u8 vm_status;
> +	u8 os_status;
> +	__le16 app_status;
> +} __packed;
> +
> +#define GH_RM_NOTIFICATION_VM_STATUS		 0x56100008
> +
> +/* RPC Calls */
> +int gh_rm_alloc_vmid(struct gh_rm *rm, u16 vmid);
> +int gh_rm_dealloc_vmid(struct gh_rm *rm, u16 vmid);
> +int gh_rm_vm_reset(struct gh_rm *rm, u16 vmid);
> +int gh_rm_vm_start(struct gh_rm *rm, u16 vmid);
> +int gh_rm_vm_stop(struct gh_rm *rm, u16 vmid);
> +
> +enum gh_rm_vm_auth_mechanism {
> +	GH_RM_VM_AUTH_NONE		= 0,
> +	GH_RM_VM_AUTH_QCOM_PIL_ELF	= 1,
> +	GH_RM_VM_AUTH_QCOM_ANDROID_PVM	= 2,
> +};
> +
> +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);
> +int gh_rm_vm_init(struct gh_rm *rm, u16 vmid);
> +
> +struct gh_rm_hyp_resource {
> +	u8 type;
> +	u8 reserved;
> +	__le16 partner_vmid;
> +	__le32 resource_handle;
> +	__le32 resource_label;
> +	__le64 cap_id;
> +	__le32 virq_handle;
> +	__le32 virq;
> +	__le64 base;
> +	__le64 size;
> +} __packed;
> +
> +struct gh_rm_hyp_resources {
> +	__le32 n_entries;
> +	struct gh_rm_hyp_resource entries[];
> +} __packed;
> +
> +int gh_rm_get_hyp_resources(struct gh_rm *rm, u16 vmid,
> +				struct gh_rm_hyp_resources **resources);
> +int gh_rm_get_vmid(struct gh_rm *rm, u16 *vmid);
> +
>   #endif