4e647fa085
shm_open() creates and opens a new POSIX shared memory object. A POSIX shared memory object allows creating memory backend with an associated file descriptor that can be shared with external processes (e.g. vhost-user). The new `memory-backend-shm` can be used as an alternative when `memory-backend-memfd` is not available (Linux only), since shm_open() should be provided by any POSIX-compliant operating system. This backend mimics memfd, allocating memory that is practically anonymous. In theory shm_open() requires a name, but this is allocated for a short time interval and shm_unlink() is called right after shm_open(). After that, only fd is shared with external processes (e.g., vhost-user) as if it were associated with anonymous memory. In the future we may also allow the user to specify the name to be passed to shm_open(), but for now we keep the backend simple, mimicking anonymous memory such as memfd. Acked-by: David Hildenbrand <david@redhat.com> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> Acked-by: Markus Armbruster <armbru@redhat.com> (QAPI schema) Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Message-Id: <20240618100519.145853-1-sgarzare@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> |
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.. | ||
acpi.json | ||
audio.json | ||
authz.json | ||
block-core.json | ||
block-export.json | ||
block.json | ||
char.json | ||
common.json | ||
compat.json | ||
control.json | ||
crypto.json | ||
cryptodev.json | ||
cxl.json | ||
dump.json | ||
ebpf.json | ||
error.json | ||
introspect.json | ||
job.json | ||
machine-common.json | ||
machine-target.json | ||
machine.json | ||
meson.build | ||
migration.json | ||
misc-target.json | ||
misc.json | ||
net.json | ||
opts-visitor.c | ||
pci.json | ||
pragma.json | ||
qapi-clone-visitor.c | ||
qapi-dealloc-visitor.c | ||
qapi-forward-visitor.c | ||
qapi-schema.json | ||
qapi-type-helpers.c | ||
qapi-util.c | ||
qapi-visit-core.c | ||
qdev.json | ||
qmp-dispatch.c | ||
qmp-event.c | ||
qmp-registry.c | ||
qobject-input-visitor.c | ||
qobject-output-visitor.c | ||
qom.json | ||
replay.json | ||
rocker.json | ||
run-state.json | ||
sockets.json | ||
stats.json | ||
string-input-visitor.c | ||
string-output-visitor.c | ||
tpm.json | ||
trace-events | ||
trace.h | ||
trace.json | ||
transaction.json | ||
ui.json | ||
vfio.json | ||
virtio.json | ||
yank.json |