On 12/10/18 11:31 AM, Dr. David Alan Gilbert (git) wrote:
From: "Dr. David Alan Gilbert" <dgilb...@redhat.com>
Define a new capability type 'VIRTIO_PCI_CAP_SHARED_MEMORY_CFG'
and the data structure 'virtio_pci_shm_cap' 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 a device-specific 'id'.
Signed-off-by: Dr. David Alan Gilbert <dgilb...@redhat.com>
---
hw/virtio/virtio-pci.c | 20 ++++++++++++++++++++
include/standard-headers/linux/virtio_pci.h | 9 +++++++++
2 files changed, 29 insertions(+)
+++ b/include/standard-headers/linux/virtio_pci.h
@@ -113,6 +113,8 @@
#define VIRTIO_PCI_CAP_DEVICE_CFG 4
/* PCI configuration access */
#define VIRTIO_PCI_CAP_PCI_CFG 5
+/* Additional shared memory capability */
+#define VIRTIO_PCI_CAP_SHARED_MEMORY_CFG 8
/* This is the PCI capability header: */
struct virtio_pci_cap {
@@ -163,6 +165,13 @@ struct virtio_pci_cfg_cap {
uint8_t pci_cfg_data[4]; /* Data for BAR access. */
};
+struct virtio_pci_shm_cap {
+ struct virtio_pci_cap cap;
+ uint32_t offset_hi; /* Most sig 32 bits of offset */
+ uint32_t length_hi; /* Most sig 32 bits of length */
+ uint8_t id; /* To distinguish shm chunks */
TAB damage.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
