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From: | Eric Blake |
Subject: | Re: [Qemu-devel] [RFC PATCH 1/7] virtio: Add shared memory capability |
Date: | Mon, 10 Dec 2018 15:03:27 -0600 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 |
On 12/10/18 11:31 AM, Dr. David Alan Gilbert (git) wrote:
From: "Dr. David Alan Gilbert" <address@hidden> 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 <address@hidden> --- 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
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