Define and register callbacks to manage the RAM regions used for
device DMA
Signed-off-by: Elena Ufimtseva <elena.ufimts...@oracle.com>
Signed-off-by: John G Johnson <john.g.john...@oracle.com>
Signed-off-by: Jagannathan Raman <jag.ra...@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
---
hw/remote/vfio-user-obj.c | 50 +++++++++++++++++++++++++++++++++++++++
hw/remote/trace-events | 2 ++
2 files changed, 52 insertions(+)
diff --git a/hw/remote/vfio-user-obj.c b/hw/remote/vfio-user-obj.c
index 8951617545..e690f1eaae 100644
--- a/hw/remote/vfio-user-obj.c
+++ b/hw/remote/vfio-user-obj.c
@@ -248,6 +248,49 @@ static ssize_t vfu_object_cfg_access(vfu_ctx_t *vfu_ctx,
char * const buf,
return count;
}
+static void dma_register(vfu_ctx_t *vfu_ctx, vfu_dma_info_t *info)
+{
+ VfuObject *o = vfu_get_private(vfu_ctx);
+ MemoryRegion *subregion = NULL;
+ g_autofree char *name = NULL;
+ struct iovec *iov = &info->iova;
+
+ if (!info->vaddr) {
+ return;
+ }
+
+ name = g_strdup_printf("mem-%s-%"PRIx64"", o->device,
+ (uint64_t)info->vaddr);
+
+ subregion = g_new0(MemoryRegion, 1);
+
+ memory_region_init_ram_ptr(subregion, NULL, name,
+ iov->iov_len, info->vaddr);
+
+ memory_region_add_subregion(pci_address_space(o->pci_dev),
+ (hwaddr)iov->iov_base, subregion);
+
+ trace_vfu_dma_register((uint64_t)iov->iov_base, iov->iov_len);
+}
+
+static void dma_unregister(vfu_ctx_t *vfu_ctx, vfu_dma_info_t *info)
+{
+ VfuObject *o = vfu_get_private(vfu_ctx);
+ MemoryRegion *mr = NULL;
+ ram_addr_t offset;
+
+ mr = memory_region_from_host(info->vaddr, &offset);
+ if (!mr) {
+ return;
+ }
+
+ memory_region_del_subregion(pci_address_space(o->pci_dev), mr);
+
+ object_unparent((OBJECT(mr)));
+
+ trace_vfu_dma_unregister((uint64_t)info->iova.iov_base);
+}
+
/*
* TYPE_VFU_OBJECT depends on the availability of the 'socket' and 'device'
* properties. It also depends on devices instantiated in QEMU. These
@@ -336,6 +379,13 @@ static void vfu_object_init_ctx(VfuObject *o, Error **errp)
goto fail;
}
+ ret = vfu_setup_device_dma(o->vfu_ctx, &dma_register, &dma_unregister);
+ if (ret < 0) {
+ error_setg(errp, "vfu: Failed to setup DMA handlers for %s",
+ o->device);
+ goto fail;
+ }
+
ret = vfu_realize_ctx(o->vfu_ctx);
if (ret < 0) {
error_setg(errp, "vfu: Failed to realize device %s- %s",
diff --git a/hw/remote/trace-events b/hw/remote/trace-events
index 2ef7884346..f945c7e33b 100644
--- a/hw/remote/trace-events
+++ b/hw/remote/trace-events
@@ -7,3 +7,5 @@ mpqemu_recv_io_error(int cmd, int size, int nfds) "failed to
receive %d size %d,
vfu_prop(const char *prop, const char *val) "vfu: setting %s as %s"
vfu_cfg_read(uint32_t offset, uint32_t val) "vfu: cfg: 0x%u -> 0x%x"
vfu_cfg_write(uint32_t offset, uint32_t val) "vfu: cfg: 0x%u <- 0x%x"
+vfu_dma_register(uint64_t gpa, size_t len) "vfu: registering GPA 0x%"PRIx64",
%zu bytes"
+vfu_dma_unregister(uint64_t gpa) "vfu: unregistering GPA 0x%"PRIx64""
--
2.20.1
