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exec: keep ram block across fork when using qtest

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Ram blocks were marked MADV_DONTFORK breaking fuzzing-tests which
execute each test-input in a forked process.

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Message-id: 20200220041118.23264-14-alxndr@bu.edu
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Alexander Bulekov 2020-02-19 23:11:09 -05:00 committed by Stefan Hajnoczi
parent 5f6fd09a97
commit a028edeaa6
1 changed files with 10 additions and 2 deletions
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12
exec.c
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@ -35,6 +35,7 @@
#include "sysemu/kvm.h"
#include "sysemu/sysemu.h"
#include "sysemu/tcg.h"
#include "sysemu/qtest.h"
#include "qemu/timer.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
@ -2305,8 +2306,15 @@ static void ram_block_add(RAMBlock *new_block, Error **errp, bool shared)
if (new_block->host) {
qemu_ram_setup_dump(new_block->host, new_block->max_length);
qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_HUGEPAGE);
/* MADV_DONTFORK is also needed by KVM in absence of synchronous MMU */
qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_DONTFORK);
/*
* MADV_DONTFORK is also needed by KVM in absence of synchronous MMU
* Configure it unless the machine is a qtest server, in which case
* KVM is not used and it may be forked (eg for fuzzing purposes).
*/
if (!qtest_enabled()) {
qemu_madvise(new_block->host, new_block->max_length,
QEMU_MADV_DONTFORK);
}
ram_block_notify_add(new_block->host, new_block->max_length);
}
}