diff --git a/drivers/virt/gunyah/rsc_mgr.h b/drivers/virt/gunyah/rsc_mgr.h
index 52711de77bb79..ec8ad8149e8ef 100644
--- a/drivers/virt/gunyah/rsc_mgr.h
+++ b/drivers/virt/gunyah/rsc_mgr.h
@@ -10,6 +10,7 @@
 #include <linux/types.h>
 
 #define GUNYAH_VMID_INVAL U16_MAX
+#define GUNYAH_MEM_HANDLE_INVAL U32_MAX
 
 struct gunyah_rm;
 
@@ -58,6 +59,12 @@ struct gunyah_rm_vm_status_payload {
 	__le16 app_status;
 } __packed;
 
+/* RPC Calls */
+int gunyah_rm_mem_share(struct gunyah_rm *rm,
+			struct gunyah_rm_mem_parcel *parcel);
+int gunyah_rm_mem_reclaim(struct gunyah_rm *rm,
+			  struct gunyah_rm_mem_parcel *parcel);
+
 int gunyah_rm_alloc_vmid(struct gunyah_rm *rm, u16 vmid);
 int gunyah_rm_dealloc_vmid(struct gunyah_rm *rm, u16 vmid);
 int gunyah_rm_vm_reset(struct gunyah_rm *rm, u16 vmid);
@@ -99,6 +106,8 @@ struct gunyah_rm_hyp_resources {
 int gunyah_rm_get_hyp_resources(struct gunyah_rm *rm, u16 vmid,
 				struct gunyah_rm_hyp_resources **resources);
 
+int gunyah_rm_get_vmid(struct gunyah_rm *rm, u16 *vmid);
+
 struct gunyah_resource *
 gunyah_rm_alloc_resource(struct gunyah_rm *rm,
 			 struct gunyah_rm_hyp_resource *hyp_resource);
diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c
index c2f4ccae8f3bc..eb06940bb3c53 100644
--- a/drivers/virt/gunyah/rsc_mgr_rpc.c
+++ b/drivers/virt/gunyah/rsc_mgr_rpc.c
@@ -7,6 +7,12 @@
 
 #include "rsc_mgr.h"
 
+/* Message IDs: Memory Management */
+#define GUNYAH_RM_RPC_MEM_LEND 0x51000012
+#define GUNYAH_RM_RPC_MEM_SHARE 0x51000013
+#define GUNYAH_RM_RPC_MEM_RECLAIM 0x51000015
+#define GUNYAH_RM_RPC_MEM_APPEND 0x51000018
+
 /* Message IDs: VM Management */
 /* clang-format off */
 #define GUNYAH_RM_RPC_VM_ALLOC_VMID		0x56000001
@@ -17,6 +23,7 @@
 #define GUNYAH_RM_RPC_VM_CONFIG_IMAGE		0x56000009
 #define GUNYAH_RM_RPC_VM_INIT			0x5600000B
 #define GUNYAH_RM_RPC_VM_GET_HYP_RESOURCES	0x56000020
+#define GUNYAH_RM_RPC_VM_GET_VMID		0x56000024
 /* clang-format on */
 
 struct gunyah_rm_vm_common_vmid_req {
@@ -24,6 +31,49 @@ struct gunyah_rm_vm_common_vmid_req {
 	__le16 _padding;
 } __packed;
 
+/* Call: MEM_LEND, MEM_SHARE */
+#define GUNYAH_RM_MAX_MEM_ENTRIES 512
+
+#define GUNYAH_MEM_SHARE_REQ_FLAGS_APPEND BIT(1)
+
+struct gunyah_rm_mem_share_req_header {
+	u8 mem_type;
+	u8 _padding0;
+	u8 flags;
+	u8 _padding1;
+	__le32 label;
+} __packed;
+
+struct gunyah_rm_mem_share_req_acl_section {
+	__le16 n_entries;
+	__le16 _padding;
+	struct gunyah_rm_mem_acl_entry entries[];
+} __packed;
+
+struct gunyah_rm_mem_share_req_mem_section {
+	__le16 n_entries;
+	__le16 _padding;
+	struct gunyah_rm_mem_entry entries[];
+} __packed;
+
+/* Call: MEM_RELEASE */
+struct gunyah_rm_mem_release_req {
+	__le32 mem_handle;
+	u8 flags; /* currently not used */
+	u8 _padding0;
+	__le16 _padding1;
+} __packed;
+
+/* Call: MEM_APPEND */
+#define GUNYAH_MEM_APPEND_REQ_FLAGS_END BIT(0)
+
+struct gunyah_rm_mem_append_req_header {
+	__le32 mem_handle;
+	u8 flags;
+	u8 _padding0;
+	__le16 _padding1;
+} __packed;
+
 /* Call: VM_ALLOC */
 struct gunyah_rm_vm_alloc_vmid_resp {
 	__le16 vmid;
@@ -68,6 +118,161 @@ static int gunyah_rm_common_vmid_call(struct gunyah_rm *rm, u32 message_id,
 			      NULL, NULL);
 }
 
+static int gunyah_rm_mem_append(struct gunyah_rm *rm, u32 mem_handle,
+				struct gunyah_rm_mem_entry *entries,
+				size_t n_entries)
+{
+	struct gunyah_rm_mem_append_req_header *req __free(kfree) = NULL;
+	struct gunyah_rm_mem_share_req_mem_section *mem;
+	int ret = 0;
+	size_t n;
+
+	req = kzalloc(sizeof(*req) + struct_size(mem, entries, GUNYAH_RM_MAX_MEM_ENTRIES),
+		      GFP_KERNEL);
+	if (!req)
+		return -ENOMEM;
+
+	req->mem_handle = cpu_to_le32(mem_handle);
+	mem = (void *)(req + 1);
+
+	while (n_entries) {
+		req->flags = 0;
+		if (n_entries > GUNYAH_RM_MAX_MEM_ENTRIES) {
+			n = GUNYAH_RM_MAX_MEM_ENTRIES;
+		} else {
+			req->flags |= GUNYAH_MEM_APPEND_REQ_FLAGS_END;
+			n = n_entries;
+		}
+
+		mem->n_entries = cpu_to_le16(n);
+		memcpy(mem->entries, entries, sizeof(*entries) * n);
+
+		ret = gunyah_rm_call(rm, GUNYAH_RM_RPC_MEM_APPEND, req,
+				     sizeof(*req) + struct_size(mem, entries, n),
+				     NULL, NULL);
+		if (ret)
+			break;
+
+		entries += n;
+		n_entries -= n;
+	}
+
+	return ret;
+}
+
+/**
+ * gunyah_rm_mem_share() - Share memory with other virtual machines.
+ * @rm: Handle to a Gunyah resource manager
+ * @p: Information about the memory to be shared.
+ *
+ * Sharing keeps Linux's access to the memory while the memory parcel is shared.
+ */
+int gunyah_rm_mem_share(struct gunyah_rm *rm, struct gunyah_rm_mem_parcel *p)
+{
+	u32 message_id = p->n_acl_entries == 1 ? GUNYAH_RM_RPC_MEM_LEND :
+						 GUNYAH_RM_RPC_MEM_SHARE;
+	size_t msg_size, initial_mem_entries = p->n_mem_entries, resp_size;
+	struct gunyah_rm_mem_share_req_acl_section *acl;
+	struct gunyah_rm_mem_share_req_mem_section *mem;
+	struct gunyah_rm_mem_share_req_header *req_header;
+	size_t acl_size, mem_size;
+	u32 *attr_section;
+	bool need_append = false;
+	__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 != GUNYAH_MEM_HANDLE_INVAL)
+		return -EINVAL;
+
+	if (initial_mem_entries > GUNYAH_RM_MAX_MEM_ENTRIES) {
+		initial_mem_entries = GUNYAH_RM_MAX_MEM_ENTRIES;
+		need_append = true;
+	}
+
+	acl_size = struct_size(acl, entries, p->n_acl_entries);
+	mem_size = struct_size(mem, entries, initial_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 gunyah_rm_mem_share_req_header) + acl_size +
+		   mem_size +
+		   sizeof(u32); /* for memory attributes, currently unused */
+
+	msg = kzalloc(msg_size, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	req_header = msg;
+	acl = (void *)req_header + sizeof(*req_header);
+	mem = (void *)acl + acl_size;
+	attr_section = (void *)mem + mem_size;
+
+	req_header->mem_type = p->mem_type;
+	if (need_append)
+		req_header->flags |= GUNYAH_MEM_SHARE_REQ_FLAGS_APPEND;
+	req_header->label = cpu_to_le32(p->label);
+
+	acl->n_entries = cpu_to_le32(p->n_acl_entries);
+	memcpy(acl->entries, p->acl_entries,
+	       flex_array_size(acl, entries, p->n_acl_entries));
+
+	mem->n_entries = cpu_to_le16(initial_mem_entries);
+	memcpy(mem->entries, p->mem_entries,
+	       flex_array_size(mem, entries, initial_mem_entries));
+
+	/* Set n_entries for memory attribute section to 0 */
+	*attr_section = 0;
+
+	ret = gunyah_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);
+	kfree(resp);
+
+	if (need_append) {
+		ret = gunyah_rm_mem_append(
+			rm, p->mem_handle, &p->mem_entries[initial_mem_entries],
+			p->n_mem_entries - initial_mem_entries);
+		if (ret) {
+			gunyah_rm_mem_reclaim(rm, p);
+			p->mem_handle = GUNYAH_MEM_HANDLE_INVAL;
+		}
+	}
+
+	return ret;
+}
+ALLOW_ERROR_INJECTION(gunyah_rm_mem_share, ERRNO);
+
+/**
+ * gunyah_rm_mem_reclaim() - Reclaim a memory parcel
+ * @rm: Handle to a Gunyah resource manager
+ * @parcel: Information about the memory to be reclaimed.
+ *
+ * RM maps the associated memory back into the stage-2 page tables of the owner VM.
+ */
+int gunyah_rm_mem_reclaim(struct gunyah_rm *rm,
+			  struct gunyah_rm_mem_parcel *parcel)
+{
+	struct gunyah_rm_mem_release_req req = {
+		.mem_handle = cpu_to_le32(parcel->mem_handle),
+	};
+
+	return gunyah_rm_call(rm, GUNYAH_RM_RPC_MEM_RECLAIM, &req, sizeof(req),
+			      NULL, NULL);
+}
+ALLOW_ERROR_INJECTION(gunyah_rm_mem_reclaim, ERRNO);
+
 /**
  * gunyah_rm_alloc_vmid() - Allocate a new VM in Gunyah. Returns the VM identifier.
  * @rm: Handle to a Gunyah resource manager
@@ -246,3 +451,32 @@ int gunyah_rm_get_hyp_resources(struct gunyah_rm *rm, u16 vmid,
 	return 0;
 }
 ALLOW_ERROR_INJECTION(gunyah_rm_get_hyp_resources, ERRNO);
+
+/**
+ * gunyah_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 gunyah_rm_get_vmid(struct gunyah_rm *rm, u16 *vmid)
+{
+	static u16 cached_vmid = GUNYAH_VMID_INVAL;
+	size_t resp_size;
+	__le32 *resp;
+	int ret;
+
+	if (cached_vmid != GUNYAH_VMID_INVAL) {
+		*vmid = cached_vmid;
+		return 0;
+	}
+
+	ret = gunyah_rm_call(rm, GUNYAH_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(gunyah_rm_get_vmid);
diff --git a/include/linux/gunyah.h b/include/linux/gunyah.h
index 24c02c6827738..c23e1a88703e8 100644
--- a/include/linux/gunyah.h
+++ b/include/linux/gunyah.h
@@ -155,6 +155,49 @@ int gunyah_vm_add_resource_ticket(struct gunyah_vm *ghvm,
 void gunyah_vm_remove_resource_ticket(struct gunyah_vm *ghvm,
 				      struct gunyah_vm_resource_ticket *ticket);
 
+#define GUNYAH_RM_ACL_X BIT(0)
+#define GUNYAH_RM_ACL_W BIT(1)
+#define GUNYAH_RM_ACL_R BIT(2)
+
+struct gunyah_rm_mem_acl_entry {
+	__le16 vmid;
+	u8 perms;
+	u8 reserved;
+} __packed;
+
+struct gunyah_rm_mem_entry {
+	__le64 phys_addr;
+	__le64 size;
+} __packed;
+
+enum gunyah_rm_mem_type {
+	GUNYAH_RM_MEM_TYPE_NORMAL = 0,
+	GUNYAH_RM_MEM_TYPE_IO = 1,
+};
+
+/*
+ * struct gunyah_rm_mem_parcel - 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.
+ * @n_acl_entries: Count of the number of entries in the @acl_entries array.
+ * @acl_entries: An array of access control entries. Each entry specifies a VM and what access
+ *               is allowed for the memory parcel.
+ * @n_mem_entries: Count of the number of entries in the @mem_entries array.
+ * @mem_entries: An array of regions to be associated with the memory parcel. Addresses should be
+ *               (intermediate) physical addresses from Linux's perspective.
+ * @mem_handle: On success, filled with memory handle that RM allocates for this memory parcel
+ */
+struct gunyah_rm_mem_parcel {
+	enum gunyah_rm_mem_type mem_type;
+	u32 label;
+	size_t n_acl_entries;
+	struct gunyah_rm_mem_acl_entry *acl_entries;
+	size_t n_mem_entries;
+	struct gunyah_rm_mem_entry *mem_entries;
+	u32 mem_handle;
+};
+
 /******************************************************************************/
 /* Common arch-independent definitions for Gunyah hypercalls                  */
 #define GUNYAH_CAPID_INVAL U64_MAX
