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[RFC QEMU PATCH 01/18] virtio: Add shared memory capability
From: |
Huang Rui |
Subject: |
[RFC QEMU PATCH 01/18] virtio: Add shared memory capability |
Date: |
Sun, 12 Mar 2023 17:22:27 +0800 |
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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>
---
hw/virtio/virtio-pci.c | 18 ++++++++++++++++++
include/hw/virtio/virtio-pci.h | 4 ++++
2 files changed, 22 insertions(+)
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index a1c9dfa7bb..ae4c29cb96 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1191,6 +1191,24 @@ 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)
{
diff --git a/include/hw/virtio/virtio-pci.h b/include/hw/virtio/virtio-pci.h
index 938799e8f6..e67fe422a1 100644
--- a/include/hw/virtio/virtio-pci.h
+++ b/include/hw/virtio/virtio-pci.h
@@ -257,4 +257,8 @@ 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
--
2.25.1
- [RFC QEMU PATCH 00/18] Add VirtIO GPU and Passthrough GPU support on Xen, Huang Rui, 2023/03/12
- [RFC QEMU PATCH 01/18] virtio: Add shared memory capability,
Huang Rui <=
- [RFC QEMU PATCH 02/18] virtio-gpu: hostmem, Huang Rui, 2023/03/12
- [RFC QEMU PATCH 03/18] virtio-gpu: Handle resource blob commands, Huang Rui, 2023/03/12
- [RFC QEMU PATCH 04/18] virtio-gpu: CONTEXT_INIT feature, Huang Rui, 2023/03/12
- [RFC QEMU PATCH 05/18] virtio-gpu: Unrealize, Huang Rui, 2023/03/12
- [RFC QEMU PATCH 06/18] virtio-gpu: Resource UUID, Huang Rui, 2023/03/12
- [RFC QEMU PATCH 07/18] virtio-gpu: Support Venus capset, Huang Rui, 2023/03/12
- [RFC QEMU PATCH 08/18] virtio-gpu: Initialize Venus, Huang Rui, 2023/03/12