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[RFC PATCH v2 3/4] vhost: register and change IOMMU flag depending on De
From: |
Viktor Prutyanov |
Subject: |
[RFC PATCH v2 3/4] vhost: register and change IOMMU flag depending on Device-TLB state |
Date: |
Mon, 1 May 2023 05:02:20 +0300 |
The guest can disable or never enable Device-TLB. In these cases,
it can't be used even if enabled in QEMU. So, check Device-TLB state
before registering IOMMU notifier and select unmap flag depending on
that. Also, implement a way to change IOMMU notifier flag if Device-TLB
state is changed.
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2001312
Signed-off-by: Viktor Prutyanov <viktor@daynix.com>
---
hw/virtio/vhost-backend.c | 6 ++++++
hw/virtio/vhost.c | 26 ++++++++++++++++++++++++--
include/hw/virtio/vhost-backend.h | 4 ++++
include/hw/virtio/vhost.h | 1 +
4 files changed, 35 insertions(+), 2 deletions(-)
diff --git a/hw/virtio/vhost-backend.c b/hw/virtio/vhost-backend.c
index 8e581575c9..30eb71fb83 100644
--- a/hw/virtio/vhost-backend.c
+++ b/hw/virtio/vhost-backend.c
@@ -297,6 +297,11 @@ static void vhost_kernel_set_iotlb_callback(struct
vhost_dev *dev,
qemu_set_fd_handler((uintptr_t)dev->opaque, NULL, NULL, NULL);
}
+static void vhost_kernel_toggle_device_iotlb(struct vhost_dev *dev, int enable)
+{
+ vhost_toggle_device_iotlb(dev, enable);
+}
+
const VhostOps kernel_ops = {
.backend_type = VHOST_BACKEND_TYPE_KERNEL,
.vhost_backend_init = vhost_kernel_init,
@@ -328,6 +333,7 @@ const VhostOps kernel_ops = {
.vhost_vsock_set_running = vhost_kernel_vsock_set_running,
.vhost_set_iotlb_callback = vhost_kernel_set_iotlb_callback,
.vhost_send_device_iotlb_msg = vhost_kernel_send_device_iotlb_msg,
+ .vhost_toggle_device_iotlb = vhost_kernel_toggle_device_iotlb,
};
#endif
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index a266396576..1bfcc6d263 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -796,7 +796,9 @@ static void vhost_iommu_region_add(MemoryListener *listener,
iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr,
MEMTXATTRS_UNSPECIFIED);
iommu_notifier_init(&iommu->n, vhost_iommu_unmap_notify,
- IOMMU_NOTIFIER_DEVIOTLB_UNMAP,
+ dev->vdev->device_iotlb_enabled ?
+ IOMMU_NOTIFIER_DEVIOTLB_UNMAP :
+ IOMMU_NOTIFIER_UNMAP,
section->offset_within_region,
int128_get64(end),
iommu_idx);
@@ -804,7 +806,8 @@ static void vhost_iommu_region_add(MemoryListener *listener,
iommu->iommu_offset = section->offset_within_address_space -
section->offset_within_region;
iommu->hdev = dev;
- ret = memory_region_register_iommu_notifier(section->mr, &iommu->n, NULL);
+ ret = memory_region_register_iommu_notifier(section->mr, &iommu->n,
+ dev->vdev->device_iotlb_enabled ? NULL : &error_fatal);
if (ret) {
/*
* Some vIOMMUs do not support dev-iotlb yet. If so, try to use the
@@ -841,6 +844,25 @@ static void vhost_iommu_region_del(MemoryListener
*listener,
}
}
+void vhost_toggle_device_iotlb(struct vhost_dev *dev, bool enable)
+{
+ struct vhost_iommu *iommu;
+ int ret;
+
+ QLIST_FOREACH(iommu, &dev->iommu_list, iommu_next) {
+ memory_region_unregister_iommu_notifier(iommu->mr, &iommu->n);
+ iommu->n.notifier_flags = enable ?
+ IOMMU_NOTIFIER_DEVIOTLB_UNMAP : IOMMU_NOTIFIER_UNMAP;
+ ret = memory_region_register_iommu_notifier(iommu->mr, &iommu->n,
+ enable ? NULL : &error_fatal);
+ if (ret) {
+ iommu->n.notifier_flags = IOMMU_NOTIFIER_UNMAP;
+ memory_region_register_iommu_notifier(iommu->mr, &iommu->n,
+ &error_fatal);
+ }
+ }
+}
+
static int vhost_virtqueue_set_addr(struct vhost_dev *dev,
struct vhost_virtqueue *vq,
unsigned idx, bool enable_log)
diff --git a/include/hw/virtio/vhost-backend.h
b/include/hw/virtio/vhost-backend.h
index ec3fbae58d..f8e9660a96 100644
--- a/include/hw/virtio/vhost-backend.h
+++ b/include/hw/virtio/vhost-backend.h
@@ -133,6 +133,9 @@ typedef int (*vhost_set_config_call_op)(struct vhost_dev
*dev,
typedef void (*vhost_reset_status_op)(struct vhost_dev *dev);
+typedef void (*vhost_toggle_device_iotlb_op)(struct vhost_dev *dev,
+ int enabled);
+
typedef struct VhostOps {
VhostBackendType backend_type;
vhost_backend_init vhost_backend_init;
@@ -181,6 +184,7 @@ typedef struct VhostOps {
vhost_force_iommu_op vhost_force_iommu;
vhost_set_config_call_op vhost_set_config_call;
vhost_reset_status_op vhost_reset_status;
+ vhost_toggle_device_iotlb_op vhost_toggle_device_iotlb;
} VhostOps;
int vhost_backend_update_device_iotlb(struct vhost_dev *dev,
diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index a52f273347..b3f585c6cd 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -320,6 +320,7 @@ bool vhost_has_free_slot(void);
int vhost_net_set_backend(struct vhost_dev *hdev,
struct vhost_vring_file *file);
+void vhost_toggle_device_iotlb(struct vhost_dev *dev, bool enable);
int vhost_device_iotlb_miss(struct vhost_dev *dev, uint64_t iova, int write);
int vhost_virtqueue_start(struct vhost_dev *dev, struct VirtIODevice *vdev,
--
2.35.1