| Message ID | 20210209190224.62827-6-dgilbert@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | virtiofs dax patches | expand |
On Tue, Feb 09, 2021 at 07:02:05PM +0000, Dr. David Alan Gilbert (git) wrote: > From: "Dr. David Alan Gilbert" <dgilbert@redhat.com> > > Define a new capability type 'VIRTIO_PCI_CAP_SHARED_MEMORY_CFG' > and the data structure 'virtio_pci_cap64' to go with it. > They allow defining shared memory regions with sizes and offsets > of 2^32 and more. > Multiple instances of the capability are allowed and distinguished > by the 'id' field in the base capability. > > Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> > --- > hw/virtio/virtio-pci.c | 20 ++++++++++++++++++++ > hw/virtio/virtio-pci.h | 4 ++++ > 2 files changed, 24 insertions(+) Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 094c36aa3e..de378c594e 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -1138,6 +1138,26 @@ static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy, return offset; } +int virtio_pci_add_shm_cap(VirtIOPCIProxy *proxy, + uint8_t bar, uint64_t offset, uint64_t length, + uint8_t id) +{ + struct virtio_pci_cap64 cap = { + .cap.cap_len = sizeof cap, + .cap.cfg_type = VIRTIO_PCI_CAP_SHARED_MEMORY_CFG, + }; + uint32_t mask32 = ~0; + + cap.cap.bar = bar; + cap.cap.id = id; + cap.cap.length = cpu_to_le32(length & mask32); + cap.length_hi = cpu_to_le32((length >> 32) & mask32); + cap.cap.offset = cpu_to_le32(offset & mask32); + cap.offset_hi = cpu_to_le32((offset >> 32) & mask32); + + return virtio_pci_add_mem_cap(proxy, &cap.cap); +} + static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr, unsigned size) { diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h index d7d5d403a9..31ca339099 100644 --- a/hw/virtio/virtio-pci.h +++ b/hw/virtio/virtio-pci.h @@ -247,4 +247,8 @@ void virtio_pci_types_register(const VirtioPCIDeviceTypeInfo *t); */ unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues); +int virtio_pci_add_shm_cap(VirtIOPCIProxy *proxy, + uint8_t bar, uint64_t offset, uint64_t length, + uint8_t id); + #endif