[PATCH v10 12/26] gunyah: vm_mgr: Add/remove user memory regions

[Elliot Berman]

When launching a virtual machine, Gunyah userspace allocates memory for
the guest and informs Gunyah about these memory regions through
SET_USER_MEMORY_REGION ioctl.

Co-developed-by: Prakruthi Deepak Heragu <quic_pheragu@xxxxxxxxxxx>
Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@xxxxxxxxxxx>
Signed-off-by: Elliot Berman <quic_eberman@xxxxxxxxxxx>
---
 drivers/virt/gunyah/Makefile    |   2 +-
 drivers/virt/gunyah/vm_mgr.c    |  44 ++++++
 drivers/virt/gunyah/vm_mgr.h    |  25 ++++
 drivers/virt/gunyah/vm_mgr_mm.c | 235 ++++++++++++++++++++++++++++++++
 include/uapi/linux/gunyah.h     |  33 +++++
 5 files changed, 338 insertions(+), 1 deletion(-)
 create mode 100644 drivers/virt/gunyah/vm_mgr_mm.c

diff --git a/drivers/virt/gunyah/Makefile b/drivers/virt/gunyah/Makefile
index 03951cf82023..ff8bc4925392 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 rsc_mgr_rpc.o vm_mgr.o
+gunyah_rsc_mgr-y += rsc_mgr.o rsc_mgr_rpc.o vm_mgr.o vm_mgr_mm.o
 obj-$(CONFIG_GUNYAH) += gunyah_rsc_mgr.o
diff --git a/drivers/virt/gunyah/vm_mgr.c b/drivers/virt/gunyah/vm_mgr.c
index fd890a57172e..84102bac03cc 100644
--- a/drivers/virt/gunyah/vm_mgr.c
+++ b/drivers/virt/gunyah/vm_mgr.c
@@ -18,8 +18,16 @@
 static void gh_vm_free(struct work_struct *work)
 {
 	struct gh_vm *ghvm = container_of(work, struct gh_vm, free_work);
+	struct gh_vm_mem *mapping, *tmp;
 	int ret;
 
+	mutex_lock(&ghvm->mm_lock);
+	list_for_each_entry_safe(mapping, tmp, &ghvm->memory_mappings, list) {
+		gh_vm_mem_reclaim(ghvm, mapping);
+		kfree(mapping);
+	}
+	mutex_unlock(&ghvm->mm_lock);
+
 	ret = gh_rm_dealloc_vmid(ghvm->rm, ghvm->vmid);
 	if (ret)
 		pr_warn("Failed to deallocate vmid: %d\n", ret);
@@ -48,11 +56,46 @@ static __must_check struct gh_vm *gh_vm_alloc(struct gh_rm *rm)
 	ghvm->vmid = vmid;
 	ghvm->rm = rm;
 
+	mutex_init(&ghvm->mm_lock);
+	INIT_LIST_HEAD(&ghvm->memory_mappings);
 	INIT_WORK(&ghvm->free_work, gh_vm_free);
 
 	return ghvm;
 }
 
+static long gh_vm_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	struct gh_vm *ghvm = filp->private_data;
+	void __user *argp = (void __user *)arg;
+	long r;
+
+	switch (cmd) {
+	case GH_VM_SET_USER_MEM_REGION: {
+		struct gh_userspace_memory_region region;
+
+		if (copy_from_user(&region, argp, sizeof(region)))
+			return -EFAULT;
+
+		/* All other flag bits are reserved for future use */
+		if (region.flags & ~(GH_MEM_ALLOW_READ | GH_MEM_ALLOW_WRITE | GH_MEM_ALLOW_EXEC |
+			GH_MEM_LENT))
+			return -EINVAL;
+
+
+		if (region.memory_size)
+			r = gh_vm_mem_alloc(ghvm, &region);
+		else
+			r = gh_vm_mem_free(ghvm, region.label);
+		break;
+	}
+	default:
+		r = -ENOTTY;
+		break;
+	}
+
+	return r;
+}
+
 static int gh_vm_release(struct inode *inode, struct file *filp)
 {
 	struct gh_vm *ghvm = filp->private_data;
@@ -65,6 +108,7 @@ static int gh_vm_release(struct inode *inode, struct file *filp)
 }
 
 static const struct file_operations gh_vm_fops = {
+	.unlocked_ioctl = gh_vm_ioctl,
 	.release = gh_vm_release,
 	.compat_ioctl	= compat_ptr_ioctl,
 	.llseek = noop_llseek,
diff --git a/drivers/virt/gunyah/vm_mgr.h b/drivers/virt/gunyah/vm_mgr.h
index 76954da706e9..97bc00c34878 100644
--- a/drivers/virt/gunyah/vm_mgr.h
+++ b/drivers/virt/gunyah/vm_mgr.h
@@ -7,16 +7,41 @@
 #define _GH_PRIV_VM_MGR_H
 
 #include <linux/gunyah_rsc_mgr.h>
+#include <linux/list.h>
+#include <linux/miscdevice.h>
+#include <linux/mutex.h>
 
 #include <uapi/linux/gunyah.h>
 
 long gh_dev_vm_mgr_ioctl(struct gh_rm *rm, unsigned int cmd, unsigned long arg);
 
+enum gh_vm_mem_share_type {
+	VM_MEM_SHARE,
+	VM_MEM_LEND,
+};
+
+struct gh_vm_mem {
+	struct list_head list;
+	enum gh_vm_mem_share_type share_type;
+	struct gh_rm_mem_parcel parcel;
+
+	__u64 guest_phys_addr;
+	struct page **pages;
+	unsigned long npages;
+};
+
 struct gh_vm {
 	u16 vmid;
 	struct gh_rm *rm;
 
 	struct work_struct free_work;
+	struct mutex mm_lock;
+	struct list_head memory_mappings;
 };
 
+int gh_vm_mem_alloc(struct gh_vm *ghvm, struct gh_userspace_memory_region *region);
+void gh_vm_mem_reclaim(struct gh_vm *ghvm, struct gh_vm_mem *mapping);
+int gh_vm_mem_free(struct gh_vm *ghvm, u32 label);
+struct gh_vm_mem *gh_vm_mem_find(struct gh_vm *ghvm, u32 label);
+
 #endif
diff --git a/drivers/virt/gunyah/vm_mgr_mm.c b/drivers/virt/gunyah/vm_mgr_mm.c
new file mode 100644
index 000000000000..03e71a36ea3b
--- /dev/null
+++ b/drivers/virt/gunyah/vm_mgr_mm.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#define pr_fmt(fmt) "gh_vm_mgr: " fmt
+
+#include <linux/gunyah_rsc_mgr.h>
+#include <linux/mm.h>
+
+#include <uapi/linux/gunyah.h>
+
+#include "vm_mgr.h"
+
+static inline bool page_contiguous(phys_addr_t p, phys_addr_t t)
+{
+	return t - p == PAGE_SIZE;
+}
+
+static struct gh_vm_mem *__gh_vm_mem_find(struct gh_vm *ghvm, u32 label)
+	__must_hold(&ghvm->mm_lock)
+{
+	struct gh_vm_mem *mapping;
+
+	list_for_each_entry(mapping, &ghvm->memory_mappings, list)
+		if (mapping->parcel.label == label)
+			return mapping;
+
+	return NULL;
+}
+
+void gh_vm_mem_reclaim(struct gh_vm *ghvm, struct gh_vm_mem *mapping)
+	__must_hold(&ghvm->mm_lock)
+{
+	int i, ret = 0;
+
+	if (mapping->parcel.mem_handle != GH_MEM_HANDLE_INVAL) {
+		ret = gh_rm_mem_reclaim(ghvm->rm, &mapping->parcel);
+		if (ret)
+			pr_warn("Failed to reclaim memory parcel for label %d: %d\n",
+				mapping->parcel.label, ret);
+	}
+
+	if (!ret)
+		for (i = 0; i < mapping->npages; i++)
+			unpin_user_page(mapping->pages[i]);
+
+	kfree(mapping->pages);
+	kfree(mapping->parcel.acl_entries);
+	kfree(mapping->parcel.mem_entries);
+
+	list_del(&mapping->list);
+}
+
+struct gh_vm_mem *gh_vm_mem_find(struct gh_vm *ghvm, u32 label)
+{
+	struct gh_vm_mem *mapping;
+	int ret;
+
+	ret = mutex_lock_interruptible(&ghvm->mm_lock);
+	if (ret)
+		return ERR_PTR(ret);
+	mapping = __gh_vm_mem_find(ghvm, label);
+	mutex_unlock(&ghvm->mm_lock);
+	return mapping ? : ERR_PTR(-ENODEV);
+}
+
+int gh_vm_mem_alloc(struct gh_vm *ghvm, struct gh_userspace_memory_region *region)
+{
+	struct gh_vm_mem *mapping, *tmp_mapping;
+	struct gh_rm_mem_entry *mem_entries;
+	phys_addr_t curr_page, prev_page;
+	struct gh_rm_mem_parcel *parcel;
+	int i, j, pinned, ret = 0;
+	size_t entry_size;
+	u16 vmid;
+
+	if (!gh_api_has_feature(GH_API_FEATURE_MEMEXTENT))
+		return -EOPNOTSUPP;
+
+	if (!region->memory_size || !PAGE_ALIGNED(region->memory_size) ||
+		!PAGE_ALIGNED(region->userspace_addr) || !PAGE_ALIGNED(region->guest_phys_addr))
+		return -EINVAL;
+
+	ret = mutex_lock_interruptible(&ghvm->mm_lock);
+	if (ret)
+		return ret;
+	mapping = __gh_vm_mem_find(ghvm, region->label);
+	if (mapping) {
+		mutex_unlock(&ghvm->mm_lock);
+		return -EEXIST;
+	}
+
+	mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
+	if (!mapping) {
+		ret = -ENOMEM;
+		goto free_mapping;
+	}
+
+	mapping->parcel.label = region->label;
+	mapping->guest_phys_addr = region->guest_phys_addr;
+	mapping->npages = region->memory_size >> PAGE_SHIFT;
+	parcel = &mapping->parcel;
+	parcel->mem_handle = GH_MEM_HANDLE_INVAL; /* to be filled later by mem_share/mem_lend */
+	parcel->mem_type = GH_RM_MEM_TYPE_NORMAL;
+
+	/* Check for overlap */
+	list_for_each_entry(tmp_mapping, &ghvm->memory_mappings, list) {
+		if (!((mapping->guest_phys_addr + (mapping->npages << PAGE_SHIFT) <=
+			tmp_mapping->guest_phys_addr) ||
+			(mapping->guest_phys_addr >=
+			tmp_mapping->guest_phys_addr + (tmp_mapping->npages << PAGE_SHIFT)))) {
+			ret = -EEXIST;
+			goto free_mapping;
+		}
+	}
+
+	list_add(&mapping->list, &ghvm->memory_mappings);
+
+	mapping->pages = kcalloc(mapping->npages, sizeof(*mapping->pages), GFP_KERNEL);
+	if (!mapping->pages) {
+		ret = -ENOMEM;
+		mapping->npages = 0; /* update npages for reclaim */
+		goto reclaim;
+	}
+
+	pinned = pin_user_pages_fast(region->userspace_addr, mapping->npages,
+					FOLL_WRITE | FOLL_LONGTERM, mapping->pages);
+	if (pinned < 0) {
+		ret = pinned;
+		mapping->npages = 0; /* update npages for reclaim */
+		goto reclaim;
+	} else if (pinned != mapping->npages) {
+		ret = -EFAULT;
+		mapping->npages = pinned; /* update npages for reclaim */
+		goto reclaim;
+	}
+
+	if (region->flags & GH_MEM_LENT) {
+		parcel->n_acl_entries = 1;
+		mapping->share_type = VM_MEM_LEND;
+	} else {
+		parcel->n_acl_entries = 2;
+		mapping->share_type = VM_MEM_SHARE;
+	}
+	parcel->acl_entries = kcalloc(parcel->n_acl_entries, sizeof(*parcel->acl_entries),
+					GFP_KERNEL);
+	if (!parcel->acl_entries) {
+		ret = -ENOMEM;
+		goto reclaim;
+	}
+
+	parcel->acl_entries[0].vmid = cpu_to_le16(ghvm->vmid);
+	if (region->flags & GH_MEM_ALLOW_READ)
+		parcel->acl_entries[0].perms |= GH_RM_ACL_R;
+	if (region->flags & GH_MEM_ALLOW_WRITE)
+		parcel->acl_entries[0].perms |= GH_RM_ACL_W;
+	if (region->flags & GH_MEM_ALLOW_EXEC)
+		parcel->acl_entries[0].perms |= GH_RM_ACL_X;
+
+	if (mapping->share_type == VM_MEM_SHARE) {
+		ret = gh_rm_get_vmid(ghvm->rm, &vmid);
+		if (ret)
+			goto reclaim;
+
+		parcel->acl_entries[1].vmid = cpu_to_le16(vmid);
+		/* Host assumed to have all these permissions. Gunyah will not
+		 * grant new permissions if host actually had less than RWX
+		 */
+		parcel->acl_entries[1].perms |= GH_RM_ACL_R | GH_RM_ACL_W | GH_RM_ACL_X;
+	}
+
+	mem_entries = kcalloc(mapping->npages, sizeof(*mem_entries), GFP_KERNEL);
+	if (!mem_entries) {
+		ret = -ENOMEM;
+		goto reclaim;
+	}
+
+	/* reduce number of entries by combining contiguous pages into single memory entry */
+	prev_page = page_to_phys(mapping->pages[0]);
+	mem_entries[0].ipa_base = cpu_to_le64(prev_page);
+	entry_size = PAGE_SIZE;
+	for (i = 1, j = 0; i < mapping->npages; i++) {
+		curr_page = page_to_phys(mapping->pages[i]);
+		if (page_contiguous(prev_page, curr_page)) {
+			entry_size += PAGE_SIZE;
+		} else {
+			mem_entries[j].size = cpu_to_le64(entry_size);
+			j++;
+			mem_entries[j].ipa_base = cpu_to_le64(curr_page);
+			entry_size = PAGE_SIZE;
+		}
+
+		prev_page = curr_page;
+	}
+	mem_entries[j].size = cpu_to_le64(entry_size);
+
+	parcel->n_mem_entries = j + 1;
+	parcel->mem_entries = kmemdup(mem_entries, sizeof(*mem_entries) * parcel->n_mem_entries,
+					GFP_KERNEL);
+	kfree(mem_entries);
+	if (!parcel->mem_entries) {
+		ret = -ENOMEM;
+		goto reclaim;
+	}
+
+	mutex_unlock(&ghvm->mm_lock);
+	return 0;
+reclaim:
+	gh_vm_mem_reclaim(ghvm, mapping);
+free_mapping:
+	kfree(mapping);
+	mutex_unlock(&ghvm->mm_lock);
+	return ret;
+}
+
+int gh_vm_mem_free(struct gh_vm *ghvm, u32 label)
+{
+	struct gh_vm_mem *mapping;
+	int ret;
+
+	ret = mutex_lock_interruptible(&ghvm->mm_lock);
+	if (ret)
+		return ret;
+
+	mapping = __gh_vm_mem_find(ghvm, label);
+	if (!mapping)
+		goto out;
+
+	gh_vm_mem_reclaim(ghvm, mapping);
+	kfree(mapping);
+out:
+	mutex_unlock(&ghvm->mm_lock);
+	return ret;
+}
diff --git a/include/uapi/linux/gunyah.h b/include/uapi/linux/gunyah.h
index 10ba32d2b0a6..d85d12119a48 100644
--- a/include/uapi/linux/gunyah.h
+++ b/include/uapi/linux/gunyah.h
@@ -20,4 +20,37 @@
  */
 #define GH_CREATE_VM			_IO(GH_IOCTL_TYPE, 0x0) /* Returns a Gunyah VM fd */
 
+/*
+ * ioctls for VM fds
+ */
+
+/**
+ * struct gh_userspace_memory_region - Userspace memory descripion for GH_VM_SET_USER_MEM_REGION
+ * @label: Unique identifer to the region.
+ * @flags: Flags for memory parcel behavior
+ * @guest_phys_addr: Location of the memory region in guest's memory space (page-aligned)
+ * @memory_size: Size of the region (page-aligned)
+ * @userspace_addr: Location of the memory region in caller (userspace)'s memory
+ *
+ * See Documentation/virt/gunyah/vm-manager.rst for further details.
+ */
+struct gh_userspace_memory_region {
+	__u32 label;
+#define GH_MEM_ALLOW_READ	(1UL << 0)
+#define GH_MEM_ALLOW_WRITE	(1UL << 1)
+#define GH_MEM_ALLOW_EXEC	(1UL << 2)
+/*
+ * The guest will be lent the memory instead of shared.
+ * In other words, the guest has exclusive access to the memory region and the host loses access.
+ */
+#define GH_MEM_LENT		(1UL << 3)
+	__u32 flags;
+	__u64 guest_phys_addr;
+	__u64 memory_size;
+	__u64 userspace_addr;
+};
+
+#define GH_VM_SET_USER_MEM_REGION	_IOW(GH_IOCTL_TYPE, 0x1, \
+						struct gh_userspace_memory_region)
+
 #endif
-- 
2.39.1