128 lines
3.4 KiB
Diff
128 lines
3.4 KiB
Diff
From 3b8a6dd1e26e4e9877e995058e65d0de80559ab1 Mon Sep 17 00:00:00 2001
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From: Jason Zeng <jason.zeng@intel.com>
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Date: Fri, 31 Aug 2018 10:58:55 +0800
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Subject: [PATCH 342/550] VHM: add guest memory remote mapping support
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There is use case which needs do data operation based on guest physical
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address. This patch added such support to do remote mapping for guest
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physical memory.
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Change-Id: I37755ddcf742129d272f535e99a070965e01c01e
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Tracked-On: 218445
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Signed-off-by: Jason Zeng <jason.zeng@intel.com>
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Signed-off-by: liang ding <liang.ding@intel.com>
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Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
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Signed-off-by: Min He <min.he@intel.com>
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Reviewed-on:
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Reviewed-by: Chi, Mingqiang <mingqiang.chi@intel.com>
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Reviewed-by: Dong, Eddie <eddie.dong@intel.com>
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Tested-by: Dong, Eddie <eddie.dong@intel.com>
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---
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drivers/vhm/vhm_mm.c | 79 +++++++++++++++++++++++++++++++++
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include/linux/vhm/acrn_vhm_mm.h | 2 +
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2 files changed, 81 insertions(+)
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diff --git a/drivers/vhm/vhm_mm.c b/drivers/vhm/vhm_mm.c
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index 9dd0b9414d3a..ea7604b19aaf 100644
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--- a/drivers/vhm/vhm_mm.c
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+++ b/drivers/vhm/vhm_mm.c
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@@ -362,3 +362,82 @@ int vhm_dev_mmap(struct file *file, struct vm_area_struct *vma)
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mutex_unlock(&vm->seg_lock);
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return -EINVAL;
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}
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+
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+static void *do_map_guest_phys(struct vhm_vm *vm, u64 guest_phys, size_t size)
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+{
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+ struct guest_memseg *seg;
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+
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+ mutex_lock(&vm->seg_lock);
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+ list_for_each_entry(seg, &vm->memseg_list, list) {
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+ if (seg->segid != VM_SYSMEM)
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+ continue;
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+
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+ if (seg->gpa > guest_phys ||
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+ guest_phys >= seg->gpa + seg->len)
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+ continue;
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+
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+ if (guest_phys + size > seg->gpa + seg->len) {
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+ mutex_unlock(&vm->seg_lock);
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+ return NULL;
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+ }
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+
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+ mutex_unlock(&vm->seg_lock);
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+ return phys_to_virt(seg->base + guest_phys - seg->gpa);
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+ }
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+ mutex_unlock(&vm->seg_lock);
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+ return NULL;
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+}
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+
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+void *map_guest_phys(unsigned long vmid, u64 guest_phys, size_t size)
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+{
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+ struct vhm_vm *vm;
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+ void *ret;
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+
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+ vm = find_get_vm(vmid);
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+ if (vm == NULL)
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+ return NULL;
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+
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+ ret = do_map_guest_phys(vm, guest_phys, size);
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+
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+ put_vm(vm);
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+
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+ return ret;
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+}
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+EXPORT_SYMBOL(map_guest_phys);
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+
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+static int do_unmap_guest_phys(struct vhm_vm *vm, u64 guest_phys)
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+{
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+ struct guest_memseg *seg;
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+
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+ mutex_lock(&vm->seg_lock);
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+ list_for_each_entry(seg, &vm->memseg_list, list) {
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+ if (seg->segid != VM_SYSMEM)
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+ continue;
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+
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+ if (seg->gpa <= guest_phys &&
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+ guest_phys < seg->gpa + seg->len) {
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+ mutex_unlock(&vm->seg_lock);
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+ return 0;
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+ }
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+ }
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+ mutex_unlock(&vm->seg_lock);
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+
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+ return -ESRCH;
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+}
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+
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+int unmap_guest_phys(unsigned long vmid, u64 guest_phys)
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+{
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+ struct vhm_vm *vm;
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+ int ret;
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+
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+ vm = find_get_vm(vmid);
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+ if (vm == NULL) {
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+ pr_warn("vm_list corrupted\n");
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+ return -ESRCH;
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+ }
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+
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+ ret = do_unmap_guest_phys(vm, guest_phys);
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+ put_vm(vm);
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+ return ret;
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+}
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+EXPORT_SYMBOL(unmap_guest_phys);
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diff --git a/include/linux/vhm/acrn_vhm_mm.h b/include/linux/vhm/acrn_vhm_mm.h
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index 325f2b2026e8..e701254bc249 100644
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--- a/include/linux/vhm/acrn_vhm_mm.h
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+++ b/include/linux/vhm/acrn_vhm_mm.h
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@@ -70,6 +70,8 @@
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#define MMU_MEM_ATTR_ALL_WB 0x00000047
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#define MMU_MEM_ATTR_ALL_WC 0x00000207
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+void *map_guest_phys(unsigned long vmid, u64 uos_phys, size_t size);
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+int unmap_guest_phys(unsigned long vmid, u64 uos_phys);
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int set_mmio_map(unsigned long vmid, unsigned long guest_gpa,
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unsigned long host_gpa, unsigned long len, int prot);
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int unset_mmio_map(unsigned long vmid, unsigned long guest_gpa,
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--
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2.19.1
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