vfio: Setup dma map for vfio device

For each guest memory region, setup the corresponding gpa to hva map
in the kernel vfio iommu table. Then the kernel vfio driver could
get the hpa through gpa. Device could use this gpa for dma also.

BUG=chromium:992270
TEST=none

Change-Id: I04008d68ab2ed182a789d6ee8c97a0ed9e1e4756
Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.corp-partner.google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1581141
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
Reviewed-by: Zach Reizner <zachr@chromium.org>
Tested-by: kokoro <noreply+kokoro@google.com>
Commit-Queue: Daniel Verkamp <dverkamp@chromium.org>

1 files changed, 9 insertions, 1 deletions

diff --git a/devices/src/pci/vfio_pci.rs b/devices/src/pci/vfio_pci.rs
index cdb253c..9073312 100644
--- a/devices/src/pci/vfio_pci.rs
+++ b/devices/src/pci/vfio_pci.rs
@@ -8,7 +8,7 @@ use std::u32;
 
 use kvm::Datamatch;
 use resources::{Alloc, SystemAllocator};
-use sys_util::EventFd;
+use sys_util::{error, EventFd};
 
 use vfio_sys::*;
 
@@ -230,6 +230,14 @@ impl PciDevice for VfioPciDevice {
                 i += 1;
             }
         }
+
+        if let Err(e) = self.device.setup_dma_map() {
+            error!(
+                "failed to add all guest memory regions into iommu table: {}",
+                e
+            );
+        }
+
         Ok(ranges)
     }