[v10,11/26] gunyah: rsc_mgr: Add RPC for sharing memory

  Gunyah resource manager provides API to manipulate stage 2 page tables.
Manipulations are represented as a memory parcel. Memory parcels
describe a list of memory regions (intermediate physical address and
size), a list of new permissions for VMs, and the memory type (DDR or
MMIO). Memory parcels are uniquely identified by a handle allocated by
Gunyah. There are a few types of memory parcel sharing which Gunyah
supports:

 - Sharing: the guest and host VM both have access
 - Lending: only the guest has access; host VM loses access
 - Donating: Permanently lent (not reclaimed even if guest shuts down)

Memory parcels that have been shared or lent can be reclaimed by the
host via an additional call. The reclaim operation restores the original
access the host VM had to the memory parcel and removes the access to
other VM.

One point to note that memory parcels don't describe where in the guest
VM the memory parcel should reside. The guest VM must accept the memory
parcel either explicitly via a "gh_rm_mem_accept" call (not introduced
here) or be configured to accept it automatically at boot. As the guest
VM accepts the memory parcel, it also mentions the IPA it wants to place
memory parcel.

Co-developed-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>
Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
---
 drivers/virt/gunyah/rsc_mgr.h     |  44 +++++++
 drivers/virt/gunyah/rsc_mgr_rpc.c | 185 ++++++++++++++++++++++++++++++
 include/linux/gunyah_rsc_mgr.h    |  47 ++++++++
 3 files changed, 276 insertions(+)
  

On 14/02/2023 21:24, Elliot Berman wrote:
> 
> Gunyah resource manager provides API to manipulate stage 2 page tables.
> Manipulations are represented as a memory parcel. Memory parcels
> describe a list of memory regions (intermediate physical address and
> size), a list of new permissions for VMs, and the memory type (DDR or
> MMIO). Memory parcels are uniquely identified by a handle allocated by
> Gunyah. There are a few types of memory parcel sharing which Gunyah
> supports:
> 
>   - Sharing: the guest and host VM both have access
>   - Lending: only the guest has access; host VM loses access
>   - Donating: Permanently lent (not reclaimed even if guest shuts down)
> 
> Memory parcels that have been shared or lent can be reclaimed by the
> host via an additional call. The reclaim operation restores the original
> access the host VM had to the memory parcel and removes the access to
> other VM.
> 
> One point to note that memory parcels don't describe where in the guest
> VM the memory parcel should reside. The guest VM must accept the memory
> parcel either explicitly via a "gh_rm_mem_accept" call (not introduced
> here) or be configured to accept it automatically at boot. As the guest
> VM accepts the memory parcel, it also mentions the IPA it wants to place
> memory parcel.
> 
> Co-developed-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>
> Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>
> Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
> ---
>   drivers/virt/gunyah/rsc_mgr.h     |  44 +++++++
>   drivers/virt/gunyah/rsc_mgr_rpc.c | 185 ++++++++++++++++++++++++++++++
>   include/linux/gunyah_rsc_mgr.h    |  47 ++++++++
>   3 files changed, 276 insertions(+)
> 
> diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h
> index 7406237bc66d..9b23cefe02b0 100644
> --- a/drivers/virt/gunyah/rsc_mgr.h
> +++ b/drivers/virt/gunyah/rsc_mgr.h
> @@ -74,6 +74,12 @@ 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: Memory Management */
> +#define GH_RM_RPC_MEM_LEND			0x51000012
> +#define GH_RM_RPC_MEM_SHARE			0x51000013
> +#define GH_RM_RPC_MEM_RECLAIM			0x51000015
> +#define GH_RM_RPC_MEM_APPEND			0x51000018
> +
>   /* Message IDs: VM Management */
>   #define GH_RM_RPC_VM_ALLOC_VMID			0x56000001
>   #define GH_RM_RPC_VM_DEALLOC_VMID		0x56000002
> @@ -90,6 +96,44 @@ struct gh_rm_vm_common_vmid_req {
>   	__le16 reserved0;
>   } __packed;
>   
> +/* Call: MEM_LEND, MEM_SHARE */
> +struct gh_rm_mem_share_req_header {
> +	u8 mem_type;
> +	u8 reserved0;
> +#define GH_MEM_SHARE_REQ_FLAGS_APPEND		BIT(1)
> +	u8 flags;
> +	u8 reserved1;
> +	__le32 label;
> +} __packed;
> +
> +struct gh_rm_mem_share_req_acl_section {
> +	__le32 n_entries;
> +	struct gh_rm_mem_acl_entry entries[];
> +};
> +
> +struct gh_rm_mem_share_req_mem_section {
> +	__le16 n_entries;
> +	__le16 reserved0;
> +	struct gh_rm_mem_entry entries[];
> +};
> +
> +/* Call: MEM_RELEASE */
> +struct gh_rm_mem_release_req {
> +	__le32 mem_handle;
> +	u8 flags; /* currently not used */
> +	__le16 reserved0;
> +	u8 reserved1;
> +} __packed;
> +
> +/* Call: MEM_APPEND */
> +struct gh_rm_mem_append_req_header {
> +	__le32 mem_handle;
> +#define GH_MEM_APPEND_REQ_FLAGS_END	BIT(0)
> +	u8 flags;
> +	__le16 reserved0;
> +	u8 reserved1;
> +} __packed;
> +
>   /* Call: VM_ALLOC */
>   struct gh_rm_vm_alloc_vmid_resp {
>   	__le16 vmid;
> diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c
> index 4515cdd80106..0c83b097fec9 100644
> --- a/drivers/virt/gunyah/rsc_mgr_rpc.c
> +++ b/drivers/virt/gunyah/rsc_mgr_rpc.c
> @@ -7,6 +7,8 @@
>   
>   #include "rsc_mgr.h"
>   
> +#define GH_RM_MAX_MEM_ENTRIES	512
> +
>   /*
>    * Several RM calls take only a VMID as a parameter and give only standard
>    * response back. Deduplicate boilerplate code by using this common call.
> @@ -22,6 +24,189 @@ static int gh_rm_common_vmid_call(struct gh_rm *rm, u32 message_id, u16 vmid)
>   	return gh_rm_call(rm, message_id, &req_payload, sizeof(req_payload), &resp, &resp_size);
>   }
>   
> +static int _gh_rm_mem_append(struct gh_rm *rm, u32 mem_handle, bool end_append,
> +			struct gh_rm_mem_entry *mem_entries, size_t n_mem_entries)
> +{
> +	struct gh_rm_mem_share_req_mem_section *mem_section;
> +	struct gh_rm_mem_append_req_header *req_header;
> +	size_t msg_size = 0, resp_size;
> +	void *msg, *resp;
> +	int ret;
> +
> +	msg_size += sizeof(struct gh_rm_mem_append_req_header);
> +	msg_size += struct_size(mem_section, entries, n_mem_entries);
> +
> +	msg = kzalloc(msg_size, GFP_KERNEL);
> +	if (!msg)
> +		return -ENOMEM;
> +
> +	req_header = msg;
> +	mem_section = (void *)req_header + sizeof(struct gh_rm_mem_append_req_header);
> +
> +	req_header->mem_handle = cpu_to_le32(mem_handle);
> +	if (end_append)
> +		req_header->flags |= GH_MEM_APPEND_REQ_FLAGS_END;
> +
> +	mem_section->n_entries = cpu_to_le16(n_mem_entries);
> +	memcpy(mem_section->entries, mem_entries, sizeof(*mem_entries) * n_mem_entries);
> +
> +	ret = gh_rm_call(rm, GH_RM_RPC_MEM_APPEND, msg, msg_size, &resp, &resp_size);

I have seen this pattern, where we pass &resp eventhough we are not 
expecting a response.

Can we make this explicit by passing NULL. This can also help to find 
any leaks of resp in case they are not freed by the caller.

ret = gh_rm_call(rm, GH_RM_RPC_MEM_APPEND, msg, msg_size, NULL, NULL);

> +	kfree(msg);
> +
> +	return ret;
> +}
> +
> +static int gh_rm_mem_append(struct gh_rm *rm, u32 mem_handle,
> +			struct gh_rm_mem_entry *mem_entries, size_t n_mem_entries)
> +{
> +	bool end_append;
> +	int ret = 0;
> +	size_t n;
> +
> +	while (n_mem_entries) {
> +		if (n_mem_entries > GH_RM_MAX_MEM_ENTRIES) {
> +			end_append = false;
> +			n = GH_RM_MAX_MEM_ENTRIES;
> +		} else {
> +			end_append = true;
> +			n = n_mem_entries;
> +		}
> +
> +		ret = _gh_rm_mem_append(rm, mem_handle, end_append, mem_entries, n);
> +		if (ret)
> +			break;
> +
> +		mem_entries += n;
> +		n_mem_entries -= n;
> +	}
> +
> +	return ret;
> +}
> +
> +static int gh_rm_mem_lend_common(struct gh_rm *rm, u32 message_id, struct gh_rm_mem_parcel *p)
> +{
> +	size_t msg_size = 0, initial_mem_entries = p->n_mem_entries, resp_size;
> +	struct gh_rm_mem_share_req_acl_section *acl_section;
> +	struct gh_rm_mem_share_req_mem_section *mem_section;
> +	struct gh_rm_mem_share_req_header *req_header;
> +	u32 *attr_section;
> +	__le32 *resp;
> +	void *msg;
> +	int ret;
> +
> +	if (!p->acl_entries || !p->n_acl_entries || !p->mem_entries || !p->n_mem_entries ||
> +	    p->n_acl_entries > U8_MAX || p->mem_handle != GH_MEM_HANDLE_INVAL)
> +		return -EINVAL;
> +
> +	if (initial_mem_entries > GH_RM_MAX_MEM_ENTRIES)
> +		initial_mem_entries = GH_RM_MAX_MEM_ENTRIES;
> +
> +	/* The format of the message goes:
> +	 * request header
> +	 * ACL entries (which VMs get what kind of access to this memory parcel)
> +	 * Memory entries (list of memory regions to share)
> +	 * Memory attributes (currently unused, we'll hard-code the size to 0)
> +	 */
> +	msg_size += sizeof(struct gh_rm_mem_share_req_header);
> +	msg_size += struct_size(acl_section, entries, p->n_acl_entries);
> +	msg_size += struct_size(mem_section, entries, initial_mem_entries);
> +	msg_size += sizeof(u32); /* for memory attributes, currently unused */
> +
> +	msg = kzalloc(msg_size, GFP_KERNEL);
> +	if (!msg)
> +		return -ENOMEM;
> +
> +	req_header = msg;
> +	acl_section = (void *)req_header + sizeof(*req_header);
> +	mem_section = (void *)acl_section + struct_size(acl_section, entries, p->n_acl_entries);
> +	attr_section = (void *)mem_section + struct_size(mem_section, entries, initial_mem_entries);
> +
> +	req_header->mem_type = p->mem_type;
> +	if (initial_mem_entries != p->n_mem_entries)
> +		req_header->flags |= GH_MEM_SHARE_REQ_FLAGS_APPEND;
> +	req_header->label = cpu_to_le32(p->label);
> +
> +	acl_section->n_entries = cpu_to_le32(p->n_acl_entries);
> +	memcpy(acl_section->entries, p->acl_entries, sizeof(*(p->acl_entries)) * p->n_acl_entries);
> +
> +	mem_section->n_entries = cpu_to_le16(initial_mem_entries);
> +	memcpy(mem_section->entries, p->mem_entries,
> +		sizeof(*(p->mem_entries)) * initial_mem_entries);
> +
> +	/* Set n_entries for memory attribute section to 0 */
> +	*attr_section = 0;
> +
> +	ret = gh_rm_call(rm, message_id, msg, msg_size, (void **)&resp, &resp_size);
> +	kfree(msg);
> +
> +	if (ret)
> +		return ret;
> +
> +	p->mem_handle = le32_to_cpu(*resp);
> +
> +	if (initial_mem_entries != p->n_mem_entries) {
> +		ret = gh_rm_mem_append(rm, p->mem_handle,
> +					&p->mem_entries[initial_mem_entries],
> +					p->n_mem_entries - initial_mem_entries);
> +		if (ret) {
> +			gh_rm_mem_reclaim(rm, p);
> +			p->mem_handle = GH_MEM_HANDLE_INVAL;
> +		}
> +	}
> +
> +	kfree(resp);
> +	return ret;
> +}
> +
> +/**
> + * gh_rm_mem_lend() - Lend memory to other virtual machines.
> + * @rm: Handle to a Gunyah resource manager
> + * @parcel: Package the memory information of the memory to be lent.
> + *
> + * Lending removes Linux's access to the memory while the memory parcel is lent.
> + */
> +int gh_rm_mem_lend(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel)
> +{
> +	return gh_rm_mem_lend_common(rm, GH_RM_RPC_MEM_LEND, parcel);
> +}
> +
> +
> +/**
> + * gh_rm_mem_share() - Share memory with other virtual machines.
> + * @rm: Handle to a Gunyah resource manager
> + * @parcel: Package the memory information of the memory to be shared.
> + *
> + * Sharing keeps Linux's access to the memory while the memory parcel is shared.
> + */
> +int gh_rm_mem_share(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel)
> +{
> +	return gh_rm_mem_lend_common(rm, GH_RM_RPC_MEM_SHARE, parcel);
> +}
> +
> +/**
> + * gh_rm_mem_reclaim() - Reclaim a memory parcel
> + * @rm: Handle to a Gunyah resource manager
> + * @parcel: Package the memory information of the memory to be reclaimed.
> + *
> + * RM maps the associated memory back into the stage-2 page tables of the owner VM.
> + */
> +int gh_rm_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel)
> +{
> +	struct gh_rm_mem_release_req req = {
> +		.mem_handle = cpu_to_le32(parcel->mem_handle),
> +	};
> +	size_t resp_size;
> +	void *resp;
> +	int ret;
> +
> +	ret = gh_rm_call(rm, GH_RM_RPC_MEM_RECLAIM, &req, sizeof(req), &resp, &resp_size);
> +	/* Do not call platform mem reclaim hooks: the reclaim didn't happen*/
> +	if (ret)
> +		return ret;
> +
how about

return gh_rm_call(rm, GH_RM_RPC_MEM_RECLAIM, &req, sizeof(req), &resp, 
&resp_size);


> +	return ret;
> +}
> +
>   /**
>    * gh_rm_alloc_vmid() - Allocate a new VM in Gunyah. Returns the VM identifier.
>    * @rm: Handle to a Gunyah resource manager
> diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h
> index e7bd29f8be6e..2d8b8b6cc394 100644
> --- a/include/linux/gunyah_rsc_mgr.h
> +++ b/include/linux/gunyah_rsc_mgr.h
> @@ -11,6 +11,7 @@
>   #include <linux/gunyah.h>
>   
>   #define GH_VMID_INVAL	U16_MAX
> +#define GH_MEM_HANDLE_INVAL	U32_MAX
>   
>   /* Gunyah recognizes VMID0 as an alias to the current VM's ID */
>   #define GH_VMID_SELF			0
> @@ -54,7 +55,53 @@ struct gh_rm_vm_status_payload {
>   
>   #define GH_RM_NOTIFICATION_VM_STATUS		 0x56100008
>   
> +struct gh_rm_mem_acl_entry {
> +	__le16 vmid;
> +#define GH_RM_ACL_X		BIT(0)
> +#define GH_RM_ACL_W		BIT(1)
> +#define GH_RM_ACL_R		BIT(2)
> +	u8 perms;
> +	u8 reserved;
> +} __packed;
> +
> +struct gh_rm_mem_entry {
> +	__le64 ipa_base;
> +	__le64 size;
> +} __packed;
> +
> +enum gh_rm_mem_type {
> +	GH_RM_MEM_TYPE_NORMAL	= 0,
> +	GH_RM_MEM_TYPE_IO	= 1,
> +};
> +
> +/*
> + * struct gh_rm_mem_parcel - Package info about memory to be lent/shared/donated/reclaimed
> + * @mem_type: The type of memory: normal (DDR) or IO
> + * @label: An client-specified identifier which can be used by the other VMs to identify the purpose
> + *         of the memory parcel.
> + * @acl_entries: An array of access control entries. Each entry specifies a VM and what access
> + *               is allowed for the memory parcel.
> + * @n_acl_entries: Count of the number of entries in the `acl_entries` array.
> + * @mem_entries: An list of regions to be associated with the memory parcel. Addresses should be
> + *               (intermediate) physical addresses from Linux's perspective.
> + * @n_mem_entries: Count of the number of entries in the `mem_entries` array.
> + * @mem_handle: On success, filled with memory handle that RM allocates for this memory parcel
> + */
> +struct gh_rm_mem_parcel {
> +	enum gh_rm_mem_type mem_type;
> +	u32 label;
> +	size_t n_acl_entries;
> +	struct gh_rm_mem_acl_entry *acl_entries;
> +	size_t n_mem_entries;
> +	struct gh_rm_mem_entry *mem_entries;
> +	u32 mem_handle;
> +};
> +
>   /* RPC Calls */
> +int gh_rm_mem_lend(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel);
> +int gh_rm_mem_share(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel);
> +int gh_rm_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel);
> +
>   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);