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cr-service: require non-cooperative userfaultfd for lazy-pages

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Without non-cooperative userfaultfd some programs may fail during lazy
restore because they perform operations that cannot be handled by the
lazy-pages daemon.

✓ travis-ci: success for lazy-pages: update checks for availability of userfaultfd (rev3)
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
This commit is contained in:
Mike Rapoport 2017-08-16 10:32:26 +03:00 committed by Andrei Vagin
parent 6a17d8cf49
commit 9c56992f2b
4 changed files with 12 additions and 15 deletions
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9
criu/cr-check.c
View File

@ -50,7 +50,7 @@
#include "libnetlink.h"
#include "net.h"
#include "restorer.h"
#include "linux/userfaultfd.h"
#include "uffd.h"
static char *feature_name(int (*func)());
@ -1043,15 +1043,10 @@ static int check_uffd(void)
static int check_uffd_noncoop(void)
{
unsigned long features = UFFD_FEATURE_EVENT_FORK |
UFFD_FEATURE_EVENT_REMAP |
UFFD_FEATURE_EVENT_UNMAP |
UFFD_FEATURE_EVENT_REMOVE;
if (check_uffd())
return -1;
if ((kdat.uffd_features & features) != features) {
if (!uffd_noncooperative()) {
pr_err("Non-cooperative UFFD is not supported\n");
return -1;
}

10
criu/cr-service.c
View File

@ -40,6 +40,7 @@
#include <sys/un.h>
#include <sys/socket.h>
#include "common/scm.h"
#include "uffd.h"
#include "setproctitle.h"
@ -891,14 +892,7 @@ static int handle_feature_check(int sk, CriuReq * msg)
if ((msg->features->has_lazy_pages == 1) &&
(msg->features->lazy_pages == true))
/*
* Not checking for specific UFFD features yet.
* If no error is returned it is probably
* enough for basic UFFD functionality. This can
* be extended in the future for a more detailed
* UFFD feature check.
*/
feat.lazy_pages = kdat.has_uffd;
feat.lazy_pages = kdat.has_uffd && uffd_noncooperative();
resp.features = &feat;
resp.type = msg->type;

1
criu/include/uffd.h
View File

@ -4,6 +4,7 @@
struct task_restore_args;
extern int uffd_open(int flags, unsigned long *features);
extern bool uffd_noncooperative(void);
extern int setup_uffd(int pid, struct task_restore_args *task_args);
extern int lazy_pages_setup_zombie(int pid);
extern int prepare_lazy_pages_socket(void);

7
criu/uffd.c
View File

@ -211,6 +211,13 @@ int lazy_pages_setup_zombie(int pid)
return 0;
}
bool uffd_noncooperative(void)
{
unsigned long features = NEED_UFFD_API_FEATURES;
return (kdat.uffd_features & features) == features;
}
int uffd_open(int flags, unsigned long *features)
{
struct uffdio_api uffdio_api = { 0 };