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35967bdcff
This patch adds the support for feature VIRTIO_PMEM_F_SHMEM_REGION (virtio spec v1.2 section 5.19.5.2 [1]). During feature negotiation, if VIRTIO_PMEM_F_SHMEM_REGION is offered by the device, the driver looks for a shared memory region of id 0. If it is found, this feature is understood. Otherwise, this feature bit is cleared. During probe, if VIRTIO_PMEM_F_SHMEM_REGION has been negotiated, virtio pmem ignores the `start` and `size` fields in device config and uses the physical address range of shared memory region 0. [1] https://docs.oasis-open.org/virtio/virtio/v1.2/csd01/virtio-v1.2-csd01.html#x1-6480002 Signed-off-by: Changyuan Lyu <changyuanl@google.com> Message-Id: <20231220204906.566922-1-changyuanl@google.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com>
42 lines
892 B
C
42 lines
892 B
C
/* SPDX-License-Identifier: (GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause */
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/*
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* Definitions for virtio-pmem devices.
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*
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* Copyright (C) 2019 Red Hat, Inc.
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*
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* Author(s): Pankaj Gupta <pagupta@redhat.com>
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*/
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#ifndef _UAPI_LINUX_VIRTIO_PMEM_H
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#define _UAPI_LINUX_VIRTIO_PMEM_H
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#include <linux/types.h>
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#include <linux/virtio_ids.h>
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#include <linux/virtio_config.h>
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/* Feature bits */
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/* guest physical address range will be indicated as shared memory region 0 */
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#define VIRTIO_PMEM_F_SHMEM_REGION 0
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/* shmid of the shared memory region corresponding to the pmem */
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#define VIRTIO_PMEM_SHMEM_REGION_ID 0
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struct virtio_pmem_config {
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__le64 start;
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__le64 size;
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};
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#define VIRTIO_PMEM_REQ_TYPE_FLUSH 0
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struct virtio_pmem_resp {
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/* Host return status corresponding to flush request */
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__le32 ret;
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};
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struct virtio_pmem_req {
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/* command type */
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__le32 type;
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};
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#endif
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