88 lines
3.0 KiB
Diff
88 lines
3.0 KiB
Diff
From dcf22c934f3c3672d4a4b58a74b1f99619da1d3d Mon Sep 17 00:00:00 2001
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From: Laurent Vivier <lvivier@redhat.com>
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Date: Wed, 15 Jan 2025 14:50:43 +0100
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Subject: [PATCH 2/3] vhost: Add stubs for the migration state transfer
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interface
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RH-Author: Laurent Vivier <lvivier@redhat.com>
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RH-MergeRequest: 336: virtio-net: vhost-user: Implement internal migration
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RH-Jira: RHEL-78370
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RH-Acked-by: Hanna Czenczek <hreitz@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [1/2] 4afc9b5f73e5ef2941bcf36e31c4771d2b3ab3ba (lvivier/qemu-kvm-centos)
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JIRA: https://issues.redhat.com/browse/RHEL-78370
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Migration state transfer interface is only used by vhost-user-fs,
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so the interface needs to be defined only when vhost is built.
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But I need to use this interface with virtio-net and vhost is not always
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enabled, and to avoid undefined reference error during build, define stub
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functions for vhost_supports_device_state(), vhost_save_backend_state() and
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vhost_load_backend_state().
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Cc: Hanna Czenczek <hreitz@redhat.com>
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Signed-off-by: Laurent Vivier <lvivier@redhat.com>
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Message-Id: <20250115135044.799698-2-lvivier@redhat.com>
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Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
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Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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(cherry picked from commit 3f65357313e0f928e0bd3ff868b705855d0405bc)
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Signed-off-by: Laurent Vivier <lvivier@redhat.com>
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---
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include/hw/virtio/vhost.h | 23 +++++++++++++++++++++++
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1 file changed, 23 insertions(+)
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diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
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index d75faf46e9..1d524f85b9 100644
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--- a/include/hw/virtio/vhost.h
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+++ b/include/hw/virtio/vhost.h
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@@ -363,7 +363,14 @@ static inline int vhost_reset_device(struct vhost_dev *hdev)
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* Returns true if the device supports these commands, and false if it
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* does not.
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*/
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+#ifdef CONFIG_VHOST
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bool vhost_supports_device_state(struct vhost_dev *dev);
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+#else
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+static inline bool vhost_supports_device_state(struct vhost_dev *dev)
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+{
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+ return false;
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+}
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+#endif
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/**
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* vhost_set_device_state_fd(): Begin transfer of internal state from/to
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@@ -446,7 +453,15 @@ int vhost_check_device_state(struct vhost_dev *dev, Error **errp);
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*
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* Returns 0 on success, and -errno otherwise.
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*/
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+#ifdef CONFIG_VHOST
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int vhost_save_backend_state(struct vhost_dev *dev, QEMUFile *f, Error **errp);
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+#else
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+static inline int vhost_save_backend_state(struct vhost_dev *dev, QEMUFile *f,
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+ Error **errp)
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+{
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+ return -ENOSYS;
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+}
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+#endif
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/**
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* vhost_load_backend_state(): High-level function to load a vhost
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@@ -463,6 +478,14 @@ int vhost_save_backend_state(struct vhost_dev *dev, QEMUFile *f, Error **errp);
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*
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* Returns 0 on success, and -errno otherwise.
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*/
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+#ifdef CONFIG_VHOST
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int vhost_load_backend_state(struct vhost_dev *dev, QEMUFile *f, Error **errp);
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+#else
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+static inline int vhost_load_backend_state(struct vhost_dev *dev, QEMUFile *f,
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+ Error **errp)
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+{
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+ return -ENOSYS;
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+}
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+#endif
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#endif
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--
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2.39.3
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