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virsh: Add support for VIR_MIGRATE_ZEROCOPY flag

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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Jiri Denemark 2022-06-22 16:36:53 +02:00
parent 8744beecb3
commit efa3baeae7
2 changed files with 13 additions and 1 deletions
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7
docs/manpages/virsh.rst
View File

@ -3285,7 +3285,7 @@ migrate
[--persistent] [--undefinesource] [--suspend] [--copy-storage-all]
[--copy-storage-inc] [--change-protection] [--unsafe] [--verbose]
[--rdma-pin-all] [--abort-on-error] [--postcopy]
[--postcopy-after-precopy] [--postcopy-resume]
[--postcopy-after-precopy] [--postcopy-resume] [--zerocopy]
domain desturi [migrateuri] [graphicsuri] [listen-address] [dname]
[--timeout seconds [--timeout-suspend | --timeout-postcopy]]
[--xml file] [--migrate-disks disk-list] [--disks-port port]
@ -3362,6 +3362,11 @@ high (and thus allowing the domain to lock most of the host's memory). Doing so
may be dangerous to both the domain and the host itself since the host's kernel
may run out of memory.
*--zerocopy* requests zero-copy mechanism to be used for migrating memory pages.
For QEMU/KVM this means QEMU will be temporarily allowed to lock all guest
pages in host's memory, although only those that are queued for transfer will
be locked at the same time.
``Note``: Individual hypervisors usually do not support all possible types of
migration. For example, QEMU does not support direct migration.

7
tools/virsh-domain.c
View File

@ -10890,6 +10890,10 @@ static const vshCmdOptDef opts_migrate[] = {
.type = VSH_OT_BOOL,
.help = N_("resume failed post-copy migration")
},
{.name = "zerocopy",
.type = VSH_OT_BOOL,
.help = N_("use zero-copy mechanism for migrating memory pages")
},
{.name = "migrateuri",
.type = VSH_OT_STRING,
.completer = virshCompleteEmpty,
@ -11296,6 +11300,9 @@ doMigrate(void *opaque)
if (vshCommandOptBool(cmd, "postcopy-resume"))
flags |= VIR_MIGRATE_POSTCOPY_RESUME;
if (vshCommandOptBool(cmd, "zerocopy"))
flags |= VIR_MIGRATE_ZEROCOPY;
if (vshCommandOptBool(cmd, "tls"))
flags |= VIR_MIGRATE_TLS;