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virtio: Add shared memory capability

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Define a new capability type 'VIRTIO_PCI_CAP_SHARED_MEMORY_CFG' to allow
defining shared memory regions with sizes and offsets of 2^32 and more.
Multiple instances of the capability are allowed and distinguished
by a device-specific 'id'.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Antonio Caggiano <antonio.caggiano@collabora.com>
Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Tested-by: Alyssa Ross <hi@alyssa.is>
Tested-by: Huang Rui <ray.huang@amd.com>
Tested-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
This commit is contained in:
Dr. David Alan Gilbert 2023-05-04 12:12:42 -07:00 committed by Marc-André Lureau
parent 63011373ad
commit 605a16a762
2 changed files with 22 additions and 0 deletions
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18
hw/virtio/virtio-pci.c
View File

@ -1435,6 +1435,24 @@ 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,
};
cap.cap.bar = bar;
cap.cap.length = cpu_to_le32(length);
cap.length_hi = cpu_to_le32(length >> 32);
cap.cap.offset = cpu_to_le32(offset);
cap.offset_hi = cpu_to_le32(offset >> 32);
cap.cap.id = id;
return virtio_pci_add_mem_cap(proxy, &cap.cap);
}
static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr,
unsigned size)
{

4
include/hw/virtio/virtio-pci.h
View File

@ -264,4 +264,8 @@ unsigned virtio_pci_optimal_num_queues(unsigned fixed_queues);
void virtio_pci_set_guest_notifier_fd_handler(VirtIODevice *vdev, VirtQueue *vq,
int n, bool assign,
bool with_irqfd);
int virtio_pci_add_shm_cap(VirtIOPCIProxy *proxy, uint8_t bar, uint64_t offset,
uint64_t length, uint8_t id);
#endif