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Subject: [PATCH v8 26/28] vfio-user: add 'no-direct-dma' option
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From: Jagannathan Raman <jag.raman@oracle.com>
Normally, the vfio-user client will share a region's file descriptor
with the server to allow it directly mmap() the region memory. Add an
option to disable this, so the server must use
VFIO_USER_REGION_READ/WRITE instead.
FIXME: doesn't actually stop sending the fd??
Originally-by: John Johnson <john.g.johnson@oracle.com>
Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: John Levon <john.levon@nutanix.com>
---
hw/vfio-user/common.h | 1 +
hw/vfio-user/container.c | 2 +-
hw/vfio-user/pci.c | 5 +++++
3 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/hw/vfio-user/common.h b/hw/vfio-user/common.h
index f8c61f2128..72138220ba 100644
--- a/hw/vfio-user/common.h
+++ b/hw/vfio-user/common.h
@@ -84,6 +84,7 @@ typedef struct VFIOUserProxy {
=20
/* VFIOProxy flags */
#define VFIO_PROXY_CLIENT 0x1
+#define VFIO_PROXY_NO_MMAP 0x2
#define VFIO_PROXY_FORCE_QUEUED 0x4
#define VFIO_PROXY_NO_POST 0x8
=20
diff --git a/hw/vfio-user/container.c b/hw/vfio-user/container.c
index 3974bc8a8c..3880316238 100644
--- a/hw/vfio-user/container.c
+++ b/hw/vfio-user/container.c
@@ -102,7 +102,7 @@ static int vfio_user_dma_map(const VFIOContainerBase *b=
container, hwaddr iova,
* vaddr enters as a QEMU process address; make it either a file offset
* for mapped areas or leave as 0.
*/
- if (fd !=3D -1) {
+ if (fd !=3D -1 && !(container->proxy->flags & VFIO_PROXY_NO_MMAP)) {
msgp->offset =3D qemu_ram_block_host_offset(mrp->ram_block, vaddr);
}
=20
diff --git a/hw/vfio-user/pci.c b/hw/vfio-user/pci.c
index e65c7eaf02..8a05e69a46 100644
--- a/hw/vfio-user/pci.c
+++ b/hw/vfio-user/pci.c
@@ -36,6 +36,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(VFIOUserPCIDevice, VFIO_USER_P=
CI)
struct VFIOUserPCIDevice {
VFIOPCIDevice device;
char *sock_name;
+ bool no_direct_dma; /* disable shared mem for DMA */
bool send_queued; /* all sends are queued */
bool no_post; /* all regions write are sync */
};
@@ -264,6 +265,9 @@ static void vfio_user_pci_realize(PCIDevice *pdev, Erro=
r **errp)
vbasedev->proxy =3D proxy;
vfio_user_set_handler(vbasedev, vfio_user_pci_process_req, vdev);
=20
+ if (udev->no_direct_dma) {
+ proxy->flags |=3D VFIO_PROXY_NO_MMAP;
+ }
if (udev->send_queued) {
proxy->flags |=3D VFIO_PROXY_FORCE_QUEUED;
}
@@ -402,6 +406,7 @@ static void vfio_user_pci_reset(DeviceState *dev)
=20
static const Property vfio_user_pci_dev_properties[] =3D {
DEFINE_PROP_STRING("socket", VFIOUserPCIDevice, sock_name),
+ DEFINE_PROP_BOOL("no-direct-dma", VFIOUserPCIDevice, no_direct_dma, fa=
lse),
DEFINE_PROP_BOOL("x-send-queued", VFIOUserPCIDevice, send_queued, fals=
e),
DEFINE_PROP_BOOL("x-no-posted-writes", VFIOUserPCIDevice, no_post, fal=
se),
};
--=20
2.34.1