vhost: allow backends to filter memory sections
This patch introduces a vhost op for vhost backends to allow them to filter the memory sections that they can handle. Signed-off-by: Tiwei Bie <tiwei.bie@intel.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -1620,6 +1620,16 @@ vhost_user_crypto_close_session(struct vhost_dev *dev, uint64_t session_id)
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return 0;
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}
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static bool vhost_user_mem_section_filter(struct vhost_dev *dev,
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MemoryRegionSection *section)
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{
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bool result;
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result = memory_region_get_fd(section->mr) >= 0;
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return result;
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}
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const VhostOps user_ops = {
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.backend_type = VHOST_BACKEND_TYPE_USER,
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.vhost_backend_init = vhost_user_init,
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@ -1650,4 +1660,5 @@ const VhostOps user_ops = {
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.vhost_set_config = vhost_user_set_config,
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.vhost_crypto_create_session = vhost_user_crypto_create_session,
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.vhost_crypto_close_session = vhost_user_crypto_close_session,
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.vhost_backend_mem_section_filter = vhost_user_mem_section_filter,
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};
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@ -386,7 +386,7 @@ static int vhost_verify_ring_mappings(struct vhost_dev *dev,
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return r;
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}
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static bool vhost_section(MemoryRegionSection *section)
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static bool vhost_section(struct vhost_dev *dev, MemoryRegionSection *section)
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{
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bool result;
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bool log_dirty = memory_region_get_dirty_log_mask(section->mr) &
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@ -399,6 +399,11 @@ static bool vhost_section(MemoryRegionSection *section)
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*/
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result &= !log_dirty;
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if (result && dev->vhost_ops->vhost_backend_mem_section_filter) {
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result &=
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dev->vhost_ops->vhost_backend_mem_section_filter(dev, section);
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}
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trace_vhost_section(section->mr->name, result);
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return result;
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}
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@ -632,7 +637,7 @@ static void vhost_region_addnop(MemoryListener *listener,
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struct vhost_dev *dev = container_of(listener, struct vhost_dev,
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memory_listener);
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if (!vhost_section(section)) {
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if (!vhost_section(dev, section)) {
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return;
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}
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vhost_region_add_section(dev, section);
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@ -101,6 +101,9 @@ typedef int (*vhost_crypto_create_session_op)(struct vhost_dev *dev,
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typedef int (*vhost_crypto_close_session_op)(struct vhost_dev *dev,
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uint64_t session_id);
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typedef bool (*vhost_backend_mem_section_filter_op)(struct vhost_dev *dev,
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MemoryRegionSection *section);
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typedef struct VhostOps {
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VhostBackendType backend_type;
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vhost_backend_init vhost_backend_init;
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@ -138,6 +141,7 @@ typedef struct VhostOps {
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vhost_set_config_op vhost_set_config;
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vhost_crypto_create_session_op vhost_crypto_create_session;
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vhost_crypto_close_session_op vhost_crypto_close_session;
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vhost_backend_mem_section_filter_op vhost_backend_mem_section_filter;
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} VhostOps;
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extern const VhostOps user_ops;
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