On 2019/4/26 上午1:52, Michael S. Tsirkin wrote:
On Thu, Apr 25, 2019 at 03:33:19AM -0400, Jason Wang wrote:
When the rx buffer is too small for a packet, we will discard the vq
descriptor and retry it for the next packet:
while ((sock_len = vhost_net_rx_peek_head_len(net, sock->sk,
On Fri, Apr 26, 2019 at 7:33 AM Gerd Hoffmann wrote:
>
> This reverts commit f4c34b1e2a37d5676180901fa6ff188bcb6371f8.
>
> Simliar to commit a0cecc23cfcb Revert "drm/virtio: drop prime
> import/export callbacks". We have to do the same with qxl,
> for the same reasons (it breaks DRI3).
>
> Drop t
Enhanced virtualization protection technology may require the use of
bounce buffers for I/O. While support for this was built into the virtio
core, virtio-ccw wasn't changed accordingly.
Some background on technology (not part of this series) and the
terminology used.
* Protected Virtualization (
Currently virtio-ccw devices do not work if the device has
VIRTIO_F_IOMMU_PLATFORM. In future we do want to support DMA API with
virtio-ccw.
Let us do the plumbing, so the feature VIRTIO_F_IOMMU_PLATFORM works
with virtio-ccw.
Let us also switch from legacy avail/used accessors to the DMA aware
o
On s390, protected virtualization guests have to use bounced I/O
buffers. That requires some plumbing.
Let us make sure, any device that uses DMA API with direct ops correctly
is spared from the problems, that a hypervisor attempting I/O to a
non-shared page would bring.
Signed-off-by: Halil Pas
Nothing precludes to accepting VIRTIO_F_RING_PACKED any more.
Signed-off-by: Halil Pasic
---
drivers/s390/virtio/virtio_ccw.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index 42832a164546..6d989c360f
To support protected virtualization cio will need to make sure the
memory used for communication with the hypervisor is DMA memory.
Let us introduce one global cio, and some tools for pools seated
at individual devices.
Our DMA pools are implemented as a gen_pool backed with DMA pages. The
idea i
The commit 2a2d1382fe9d ("virtio: Add improved queue allocation API")
establishes a new way of allocating virtqueues (as a part of the effort
that taught DMA to virtio rings).
In the future we will want virtio-ccw to use the DMA API as well.
Let us switch from the legacy method of allocating virt
This will come in handy soon when we pull out the indicators from
virtio_ccw_device to a memory area that is shared with the hypervisor
(in particular for protected virtualization guests).
Signed-off-by: Halil Pasic
---
drivers/s390/virtio/virtio_ccw.c | 40 +-
As virtio-ccw devices are channel devices, we need to use the dma area
for any communication with the hypervisor.
This patch addresses the most basic stuff (mostly what is required for
virtio-ccw), and does take care of QDIO or any devices.
An interesting side effect is that virtio structures are
Protected virtualization guests have to use shared pages for airq
notifier bit vectors, because hypervisor needs to write these bits.
Let us make sure we allocate DMA memory for the notifier bit vectors.
Signed-off-by: Halil Pasic
---
arch/s390/include/asm/airq.h | 2 ++
drivers/s390/cio/airq.
Hypervisor needs to interact with the summary indicators, so these
need to be DMA memory as well (at least for protected virtualization
guests).
Signed-off-by: Halil Pasic
---
drivers/s390/virtio/virtio_ccw.c | 24 +---
1 file changed, 17 insertions(+), 7 deletions(-)
diff -
Before virtio-ccw could get away with not using DMA API for the pieces of
memory it does ccw I/O with. With protected virtualization this has to
change, since the hypervisor needs to read and sometimes also write these
pieces of memory.
The hypervisor is supposed to poke the classic notifiers, if
On Fri, Apr 26, 2019 at 08:32:39PM +0200, Halil Pasic wrote:
> +EXPORT_SYMBOL_GPL(set_memory_encrypted);
> +EXPORT_SYMBOL_GPL(set_memory_decrypted);
> +EXPORT_SYMBOL_GPL(sev_active);
Why do you export these? I know x86 exports those as well, but
it shoudn't be needed there either.
_
Michael S. Tsirkin writes:
> On Wed, Apr 24, 2019 at 10:01:56PM -0300, Thiago Jung Bauermann wrote:
>>
>> Michael S. Tsirkin writes:
>>
>> > On Wed, Apr 17, 2019 at 06:42:00PM -0300, Thiago Jung Bauermann wrote:
>> >>
>> >> Michael S. Tsirkin writes:
>> >>
>> >> > On Thu, Mar 21, 2019 at 09:0
From: Longpeng
[ Upstream commit 6a8aae68c87349dbbcd46eac380bc43cdb98a13b ]
If the msix_affinity_masks is alloced failed, then we'll
try to free some resources in vp_free_vectors() that may
access it directly.
We met the following stack in our production:
[ 29.296767] BUG: unable to handle ke
From: Dongli Zhang
[ Upstream commit bf348f9b78d413e75bb079462751a1d86b6de36c ]
When tag_set->nr_maps is 1, the block layer limits the number of hw queues
by nr_cpu_ids. No matter how many hw queues are used by virtio-blk, as it
has (tag_set->nr_maps == 1), it can use at most nr_cpu_ids hw queue
From: Longpeng
[ Upstream commit 6a8aae68c87349dbbcd46eac380bc43cdb98a13b ]
If the msix_affinity_masks is alloced failed, then we'll
try to free some resources in vp_free_vectors() that may
access it directly.
We met the following stack in our production:
[ 29.296767] BUG: unable to handle ke
From: Longpeng
[ Upstream commit 6a8aae68c87349dbbcd46eac380bc43cdb98a13b ]
If the msix_affinity_masks is alloced failed, then we'll
try to free some resources in vp_free_vectors() that may
access it directly.
We met the following stack in our production:
[ 29.296767] BUG: unable to handle ke
From: Dongli Zhang
[ Upstream commit bf348f9b78d413e75bb079462751a1d86b6de36c ]
When tag_set->nr_maps is 1, the block layer limits the number of hw queues
by nr_cpu_ids. No matter how many hw queues are used by virtio-blk, as it
has (tag_set->nr_maps == 1), it can use at most nr_cpu_ids hw queue
From: Dongli Zhang
[ Upstream commit bf348f9b78d413e75bb079462751a1d86b6de36c ]
When tag_set->nr_maps is 1, the block layer limits the number of hw queues
by nr_cpu_ids. No matter how many hw queues are used by virtio-blk, as it
has (tag_set->nr_maps == 1), it can use at most nr_cpu_ids hw queue
From: Dongli Zhang
[ Upstream commit bf348f9b78d413e75bb079462751a1d86b6de36c ]
When tag_set->nr_maps is 1, the block layer limits the number of hw queues
by nr_cpu_ids. No matter how many hw queues are used by virtio-blk, as it
has (tag_set->nr_maps == 1), it can use at most nr_cpu_ids hw queue
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