clear-pkgs-linux-iot-lts2018/0464-VHM-add-guest-memory-remote-mapping-support.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jason Zeng <jason.zeng@intel.com>
Date: Fri, 31 Aug 2018 10:58:55 +0800
Subject: [PATCH] VHM: add guest memory remote mapping support

There is use case which needs do data operation based on guest physical
address. This patch added such support to do remote mapping for guest
physical memory.

Change-Id: I37755ddcf742129d272f535e99a070965e01c01e
Tracked-On: 218445
Signed-off-by: Jason Zeng <jason.zeng@intel.com>
Signed-off-by: liang ding <liang.ding@intel.com>
Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
Signed-off-by: Min He <min.he@intel.com>
Reviewed-on:
Reviewed-by: Chi, Mingqiang <mingqiang.chi@intel.com>
Reviewed-by: Dong, Eddie <eddie.dong@intel.com>
Tested-by: Dong, Eddie <eddie.dong@intel.com>
---
 drivers/vhm/vhm_mm.c            | 79 +++++++++++++++++++++++++++++++++
 include/linux/vhm/acrn_vhm_mm.h |  2 +
 2 files changed, 81 insertions(+)

diff --git a/drivers/vhm/vhm_mm.c b/drivers/vhm/vhm_mm.c
index 9dd0b9414d3a..ea7604b19aaf 100644
--- a/drivers/vhm/vhm_mm.c
+++ b/drivers/vhm/vhm_mm.c
@@ -362,3 +362,82 @@ int vhm_dev_mmap(struct file *file, struct vm_area_struct *vma)
 	mutex_unlock(&vm->seg_lock);
 	return -EINVAL;
 }
+
+static void *do_map_guest_phys(struct vhm_vm *vm, u64 guest_phys, size_t size)
+{
+	struct guest_memseg *seg;
+
+	mutex_lock(&vm->seg_lock);
+	list_for_each_entry(seg, &vm->memseg_list, list) {
+		if (seg->segid != VM_SYSMEM)
+			continue;
+
+		if (seg->gpa > guest_phys ||
+		    guest_phys >= seg->gpa + seg->len)
+			continue;
+
+		if (guest_phys + size > seg->gpa + seg->len) {
+			mutex_unlock(&vm->seg_lock);
+			return NULL;
+		}
+
+		mutex_unlock(&vm->seg_lock);
+		return phys_to_virt(seg->base + guest_phys - seg->gpa);
+	}
+	mutex_unlock(&vm->seg_lock);
+	return NULL;
+}
+
+void *map_guest_phys(unsigned long vmid, u64 guest_phys, size_t size)
+{
+	struct vhm_vm *vm;
+	void *ret;
+
+	vm = find_get_vm(vmid);
+	if (vm == NULL)
+		return NULL;
+
+	ret = do_map_guest_phys(vm, guest_phys, size);
+
+	put_vm(vm);
+
+	return ret;
+}
+EXPORT_SYMBOL(map_guest_phys);
+
+static int do_unmap_guest_phys(struct vhm_vm *vm, u64 guest_phys)
+{
+	struct guest_memseg *seg;
+
+	mutex_lock(&vm->seg_lock);
+	list_for_each_entry(seg, &vm->memseg_list, list) {
+		if (seg->segid != VM_SYSMEM)
+			continue;
+
+		if (seg->gpa <= guest_phys &&
+			guest_phys < seg->gpa + seg->len) {
+			mutex_unlock(&vm->seg_lock);
+			return 0;
+		}
+	}
+	mutex_unlock(&vm->seg_lock);
+
+	return -ESRCH;
+}
+
+int unmap_guest_phys(unsigned long vmid, u64 guest_phys)
+{
+	struct vhm_vm *vm;
+	int ret;
+
+	vm = find_get_vm(vmid);
+	if (vm == NULL) {
+		pr_warn("vm_list corrupted\n");
+		return -ESRCH;
+	}
+
+	ret = do_unmap_guest_phys(vm, guest_phys);
+	put_vm(vm);
+	return ret;
+}
+EXPORT_SYMBOL(unmap_guest_phys);
diff --git a/include/linux/vhm/acrn_vhm_mm.h b/include/linux/vhm/acrn_vhm_mm.h
index 325f2b2026e8..e701254bc249 100644
--- a/include/linux/vhm/acrn_vhm_mm.h
+++ b/include/linux/vhm/acrn_vhm_mm.h
@@ -70,6 +70,8 @@
 #define MMU_MEM_ATTR_ALL_WB	0x00000047
 #define MMU_MEM_ATTR_ALL_WC	0x00000207
 
+void *map_guest_phys(unsigned long vmid, u64 uos_phys, size_t size);
+int unmap_guest_phys(unsigned long vmid, u64 uos_phys);
 int set_mmio_map(unsigned long vmid, unsigned long guest_gpa,
 	unsigned long host_gpa, unsigned long len, int prot);
 int unset_mmio_map(unsigned long vmid, unsigned long guest_gpa,
-- 
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