| Message ID | 1485207141-1941-4-git-send-email-quintela@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
* Juan Quintela (quintela@redhat.com) wrote: > Right now, if we receive a compressed page or a xbzrle page while this > features are disabled, Bad Things (TM) can happen. Just add a test for > them. > > Signed-off-by: Juan Quintela <quintela@redhat.com> > --- > migration/ram.c | 23 ++++++++++++++++++++++- > 1 file changed, 22 insertions(+), 1 deletion(-) > > diff --git a/migration/ram.c b/migration/ram.c > index ef8fadf..4ad814a 100644 > --- a/migration/ram.c > +++ b/migration/ram.c > @@ -2455,7 +2455,7 @@ static int ram_load_postcopy(QEMUFile *f) > > static int ram_load(QEMUFile *f, void *opaque, int version_id) > { > - int flags = 0, ret = 0; > + int flags = 0, ret = 0, invalid_flags; > static uint64_t seq_iter; > int len = 0; > /* > @@ -2470,6 +2470,15 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id) > ret = -EINVAL; > } > > + invalid_flags = 0; > + > + if (!migrate_use_xbzrle()) { > + invalid_flags |= RAM_SAVE_FLAG_XBZRLE; > + } Is that really the case? I thought we used to ignore the flags on the incoming side and didn't need to enable xbzrle on the destination? Dave > + if (!migrate_use_compression()) { > + invalid_flags |= RAM_SAVE_FLAG_COMPRESS_PAGE; > + } > /* This RCU critical section can be very long running. > * When RCU reclaims in the code start to become numerous, > * it will be necessary to reduce the granularity of this > @@ -2490,6 +2499,18 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id) > flags = addr & ~TARGET_PAGE_MASK; > addr &= TARGET_PAGE_MASK; > > + if (flags & invalid_flags) { > + if (flags & invalid_flags & RAM_SAVE_FLAG_XBZRLE) { > + error_report("Received an unexpected XBRLE page"); > + } > + if (flags & invalid_flags & RAM_SAVE_FLAG_COMPRESS_PAGE) { > + error_report("Received an unexpected compressed page"); > + } > + > + ret = -EINVAL; > + break; > + } > + > if (flags & (RAM_SAVE_FLAG_COMPRESS | RAM_SAVE_FLAG_PAGE | > RAM_SAVE_FLAG_COMPRESS_PAGE | RAM_SAVE_FLAG_XBZRLE)) { > RAMBlock *block = ram_block_from_stream(f, flags); > -- > 2.9.3 > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
"Dr. David Alan Gilbert" <dgilbert@redhat.com> wrote: > * Juan Quintela (quintela@redhat.com) wrote: >> Right now, if we receive a compressed page or a xbzrle page while this >> features are disabled, Bad Things (TM) can happen. Just add a test for >> them. >> >> Signed-off-by: Juan Quintela <quintela@redhat.com> >> --- >> migration/ram.c | 23 ++++++++++++++++++++++- >> 1 file changed, 22 insertions(+), 1 deletion(-) >> >> diff --git a/migration/ram.c b/migration/ram.c >> index ef8fadf..4ad814a 100644 >> --- a/migration/ram.c >> +++ b/migration/ram.c >> @@ -2455,7 +2455,7 @@ static int ram_load_postcopy(QEMUFile *f) >> >> static int ram_load(QEMUFile *f, void *opaque, int version_id) >> { >> - int flags = 0, ret = 0; >> + int flags = 0, ret = 0, invalid_flags; >> static uint64_t seq_iter; >> int len = 0; >> /* >> @@ -2470,6 +2470,15 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id) >> ret = -EINVAL; >> } >> >> + invalid_flags = 0; >> + >> + if (!migrate_use_xbzrle()) { >> + invalid_flags |= RAM_SAVE_FLAG_XBZRLE; >> + } > > Is that really the case? I thought we used to ignore the flags on the incoming > side and didn't need to enable xbzrle on the destination? we don't need infrastructure for xbzrle, but we need it for compression. Removing xbzrle.
diff --git a/migration/ram.c b/migration/ram.c index ef8fadf..4ad814a 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2455,7 +2455,7 @@ static int ram_load_postcopy(QEMUFile *f) static int ram_load(QEMUFile *f, void *opaque, int version_id) { - int flags = 0, ret = 0; + int flags = 0, ret = 0, invalid_flags; static uint64_t seq_iter; int len = 0; /* @@ -2470,6 +2470,15 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id) ret = -EINVAL; } + invalid_flags = 0; + + if (!migrate_use_xbzrle()) { + invalid_flags |= RAM_SAVE_FLAG_XBZRLE; + } + + if (!migrate_use_compression()) { + invalid_flags |= RAM_SAVE_FLAG_COMPRESS_PAGE; + } /* This RCU critical section can be very long running. * When RCU reclaims in the code start to become numerous, * it will be necessary to reduce the granularity of this @@ -2490,6 +2499,18 @@ static int ram_load(QEMUFile *f, void *opaque, int version_id) flags = addr & ~TARGET_PAGE_MASK; addr &= TARGET_PAGE_MASK; + if (flags & invalid_flags) { + if (flags & invalid_flags & RAM_SAVE_FLAG_XBZRLE) { + error_report("Received an unexpected XBRLE page"); + } + if (flags & invalid_flags & RAM_SAVE_FLAG_COMPRESS_PAGE) { + error_report("Received an unexpected compressed page"); + } + + ret = -EINVAL; + break; + } + if (flags & (RAM_SAVE_FLAG_COMPRESS | RAM_SAVE_FLAG_PAGE | RAM_SAVE_FLAG_COMPRESS_PAGE | RAM_SAVE_FLAG_XBZRLE)) { RAMBlock *block = ram_block_from_stream(f, flags);
Right now, if we receive a compressed page or a xbzrle page while this features are disabled, Bad Things (TM) can happen. Just add a test for them. Signed-off-by: Juan Quintela <quintela@redhat.com> --- migration/ram.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-)