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Tsirkin" , Juan Quintela , Markus Armbruster , virtualization@lists.linux-foundation.org, Harpreet Singh Anand , Xiao W Wang , Stefan Hajnoczi , Eli Cohen , Michael Lilja , Stefano Garzarella Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 在 2021/5/20 上午12:28, Eugenio Pérez 写道: > Use translations added in IOVAReverseMaps in SVQ if the vhost device > does not support the mapping of the full qemu's virtual address space. > In other cases, Shadow Virtqueue still uses the qemu's virtual address > of the buffer pointed by the descriptor, which has been translated > already by qemu's VirtQueue machinery. I'd say let stick to a single kind of translation (iova allocator) that works for all the cases first and add optimizations on top. > > Now every element needs to store the previous address also, so VirtQueue > can consume the elements properly. This adds a little overhead per VQ > element, having to allocate more memory to stash them. As a possible > optimization, this allocation could be avoided if the descriptor is not > a chain but a single one, but this is left undone. > > Checking also for vhost_set_iotlb_callback to send used ring remapping. > This is only needed for kernel, and would print an error in case of > vhost devices with its own mapping (vdpa). > > This could change for other callback, like checking for > vhost_force_iommu, enable_custom_iommu, or another. Another option could > be to, at least, extract the check of "is map(used, writable) needed?" > in another function. But at the moment just copy the check used in > vhost_dev_start here. > > Signed-off-by: Eugenio Pérez > --- > hw/virtio/vhost-shadow-virtqueue.c | 134 ++++++++++++++++++++++++++--- > hw/virtio/vhost.c | 29 +++++-- > 2 files changed, 145 insertions(+), 18 deletions(-) > > diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c > index 934d3bb27b..a92da979d1 100644 > --- a/hw/virtio/vhost-shadow-virtqueue.c > +++ b/hw/virtio/vhost-shadow-virtqueue.c > @@ -10,12 +10,19 @@ > #include "hw/virtio/vhost-shadow-virtqueue.h" > #include "hw/virtio/vhost.h" > #include "hw/virtio/virtio-access.h" > +#include "hw/virtio/vhost-iova-tree.h" > > #include "standard-headers/linux/vhost_types.h" > > #include "qemu/error-report.h" > #include "qemu/main-loop.h" > > +typedef struct SVQElement { > + VirtQueueElement elem; > + void **in_sg_stash; > + void **out_sg_stash; Any reason for the trick like this? Can we simply use iovec and iov_copy() here? 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Tsirkin" , Markus Armbruster , virtualization@lists.linux-foundation.org, Harpreet Singh Anand , Xiao W Wang , Stefan Hajnoczi , Eli Cohen , Eric Blake , Michael Lilja X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" CuWcqCAyMDIxLzUvMjAg5LiK5Y2IMTI6MjgsIEV1Z2VuaW8gUMOpcmV6IOWGmemBkzoKPiBVc2Ug dHJhbnNsYXRpb25zIGFkZGVkIGluIElPVkFSZXZlcnNlTWFwcyBpbiBTVlEgaWYgdGhlIHZob3N0 IGRldmljZQo+IGRvZXMgbm90IHN1cHBvcnQgdGhlIG1hcHBpbmcgb2YgdGhlIGZ1bGwgcWVtdSdz IHZpcnR1YWwgYWRkcmVzcyBzcGFjZS4KPiBJbiBvdGhlciBjYXNlcywgU2hhZG93IFZpcnRxdWV1 ZSBzdGlsbCB1c2VzIHRoZSBxZW11J3MgdmlydHVhbCBhZGRyZXNzCj4gb2YgdGhlIGJ1ZmZlciBw b2ludGVkIGJ5IHRoZSBkZXNjcmlwdG9yLCB3aGljaCBoYXMgYmVlbiB0cmFuc2xhdGVkCj4gYWxy ZWFkeSBieSBxZW11J3MgVmlydFF1ZXVlIG1hY2hpbmVyeS4KCgpJJ2Qgc2F5IGxldCBzdGljayB0 byBhIHNpbmdsZSBraW5kIG9mIHRyYW5zbGF0aW9uIChpb3ZhIGFsbG9jYXRvcikgdGhhdCAKd29y a3MgZm9yIGFsbCB0aGUgY2FzZXMgZmlyc3QgYW5kIGFkZCBvcHRpbWl6YXRpb25zIG9uIHRvcC4K Cgo+Cj4gTm93IGV2ZXJ5IGVsZW1lbnQgbmVlZHMgdG8gc3RvcmUgdGhlIHByZXZpb3VzIGFkZHJl c3MgYWxzbywgc28gVmlydFF1ZXVlCj4gY2FuIGNvbnN1bWUgdGhlIGVsZW1lbnRzIHByb3Blcmx5 LiBUaGlzIGFkZHMgYSBsaXR0bGUgb3ZlcmhlYWQgcGVyIFZRCj4gZWxlbWVudCwgaGF2aW5nIHRv IGFsbG9jYXRlIG1vcmUgbWVtb3J5IHRvIHN0YXNoIHRoZW0uIEFzIGEgcG9zc2libGUKPiBvcHRp bWl6YXRpb24sIHRoaXMgYWxsb2NhdGlvbiBjb3VsZCBiZSBhdm9pZGVkIGlmIHRoZSBkZXNjcmlw dG9yIGlzIG5vdAo+IGEgY2hhaW4gYnV0IGEgc2luZ2xlIG9uZSwgYnV0IHRoaXMgaXMgbGVmdCB1 bmRvbmUuCj4KPiBDaGVja2luZyBhbHNvIGZvciB2aG9zdF9zZXRfaW90bGJfY2FsbGJhY2sgdG8g c2VuZCB1c2VkIHJpbmcgcmVtYXBwaW5nLgo+IFRoaXMgaXMgb25seSBuZWVkZWQgZm9yIGtlcm5l bCwgYW5kIHdvdWxkIHByaW50IGFuIGVycm9yIGluIGNhc2Ugb2YKPiB2aG9zdCBkZXZpY2VzIHdp dGggaXRzIG93biBtYXBwaW5nICh2ZHBhKS4KPgo+IFRoaXMgY291bGQgY2hhbmdlIGZvciBvdGhl ciBjYWxsYmFjaywgbGlrZSBjaGVja2luZyBmb3IKPiB2aG9zdF9mb3JjZV9pb21tdSwgZW5hYmxl X2N1c3RvbV9pb21tdSwgb3IgYW5vdGhlci4gQW5vdGhlciBvcHRpb24gY291bGQKPiBiZSB0bywg YXQgbGVhc3QsIGV4dHJhY3QgdGhlIGNoZWNrIG9mICJpcyBtYXAodXNlZCwgd3JpdGFibGUpIG5l ZWRlZD8iCj4gaW4gYW5vdGhlciBmdW5jdGlvbi4gQnV0IGF0IHRoZSBtb21lbnQganVzdCBjb3B5 IHRoZSBjaGVjayB1c2VkIGluCj4gdmhvc3RfZGV2X3N0YXJ0IGhlcmUuCj4KPiBTaWduZWQtb2Zm LWJ5OiBFdWdlbmlvIFDDqXJleiA8ZXBlcmV6bWFAcmVkaGF0LmNvbT4KPiAtLS0KPiAgIGh3L3Zp cnRpby92aG9zdC1zaGFkb3ctdmlydHF1ZXVlLmMgfCAxMzQgKysrKysrKysrKysrKysrKysrKysr KysrKystLS0KPiAgIGh3L3ZpcnRpby92aG9zdC5jICAgICAgICAgICAgICAgICAgfCAgMjkgKysr KystLQo+ICAgMiBmaWxlcyBjaGFuZ2VkLCAxNDUgaW5zZXJ0aW9ucygrKSwgMTggZGVsZXRpb25z KC0pCj4KPiBkaWZmIC0tZ2l0IGEvaHcvdmlydGlvL3Zob3N0LXNoYWRvdy12aXJ0cXVldWUuYyBi L2h3L3ZpcnRpby92aG9zdC1zaGFkb3ctdmlydHF1ZXVlLmMKPiBpbmRleCA5MzRkM2JiMjdiLi5h OTJkYTk3OWQxIDEwMDY0NAo+IC0tLSBhL2h3L3ZpcnRpby92aG9zdC1zaGFkb3ctdmlydHF1ZXVl LmMKPiArKysgYi9ody92aXJ0aW8vdmhvc3Qtc2hhZG93LXZpcnRxdWV1ZS5jCj4gQEAgLTEwLDEy ICsxMCwxOSBAQAo+ICAgI2luY2x1ZGUgImh3L3ZpcnRpby92aG9zdC1zaGFkb3ctdmlydHF1ZXVl LmgiCj4gICAjaW5jbHVkZSAiaHcvdmlydGlvL3Zob3N0LmgiCj4gICAjaW5jbHVkZSAiaHcvdmly dGlvL3ZpcnRpby1hY2Nlc3MuaCIKPiArI2luY2x1ZGUgImh3L3ZpcnRpby92aG9zdC1pb3ZhLXRy ZWUuaCIKPiAgIAo+ICAgI2luY2x1ZGUgInN0YW5kYXJkLWhlYWRlcnMvbGludXgvdmhvc3RfdHlw ZXMuaCIKPiAgIAo+ICAgI2luY2x1ZGUgInFlbXUvZXJyb3ItcmVwb3J0LmgiCj4gICAjaW5jbHVk ZSAicWVtdS9tYWluLWxvb3AuaCIKPiAgIAo+ICt0eXBlZGVmIHN0cnVjdCBTVlFFbGVtZW50IHsK PiArICAgIFZpcnRRdWV1ZUVsZW1lbnQgZWxlbTsKPiArICAgIHZvaWQgKippbl9zZ19zdGFzaDsK PiArICAgIHZvaWQgKipvdXRfc2dfc3Rhc2g7CgoKQW55IHJlYXNvbiBmb3IgdGhlIHRyaWNrIGxp a2UgdGhpcz8KCkNhbiB3ZSBzaW1wbHkgdXNlIGlvdmVjIGFuZCBpb3ZfY29weSgpIGhlcmU/CgpU aGFua3MKCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpW aXJ0dWFsaXphdGlvbiBtYWlsaW5nIGxpc3QKVmlydHVhbGl6YXRpb25AbGlzdHMubGludXgtZm91 bmRhdGlvbi5vcmcKaHR0cHM6Ly9saXN0cy5saW51eGZvdW5kYXRpb24ub3JnL21haWxtYW4vbGlz dGluZm8vdmlydHVhbGl6YXRpb24=