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postcopy: Allow hugepages 

Allow huge pages in postcopy.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20170224182844.32452-13-dgilbert@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
master
Dr. David Alan Gilbert 2017-02-24 18:28:40 +00:00
parent 4c011c37ec
commit 433bd0223c
1 changed files with 1 additions and 24 deletions
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25
migration/postcopy-ram.c
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@ -84,24 +84,6 @@ static bool ufd_version_check(int ufd)
return true;
}
/*
* Check for things that postcopy won't support; returns 0 if the block
* is fine.
*/
static int check_range(const char *block_name, void *host_addr,
ram_addr_t offset, ram_addr_t length, void *opaque)
{
RAMBlock *rb = qemu_ram_block_by_name(block_name);
if (qemu_ram_pagesize(rb) > getpagesize()) {
error_report("Postcopy doesn't support large page sizes yet (%s)",
block_name);
return -E2BIG;
}
return 0;
}
/*
* Note: This has the side effect of munlock'ing all of RAM, that's
* normally fine since if the postcopy succeeds it gets turned back on at the
@ -122,12 +104,6 @@ bool postcopy_ram_supported_by_host(void)
goto out;
}
/* Check for anything about the RAMBlocks we don't support */
if (qemu_ram_foreach_block(check_range, NULL)) {
/* check_range will have printed its own error */
goto out;
}
ufd = syscall(__NR_userfaultfd, O_CLOEXEC);
if (ufd == -1) {
error_report("%s: userfaultfd not available: %s", __func__,
@ -139,6 +115,7 @@ bool postcopy_ram_supported_by_host(void)
if (!ufd_version_check(ufd)) {
goto out;
}
/* TODO: Only allow huge pages if the kernel supports it */
/*
* userfault and mlock don't go together; we'll put it back later if