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| author | Alexander Bulekov | 2020-02-20 05:11:09 +0100 |
|---|---|---|
| committer | Stefan Hajnoczi | 2020-02-22 09:26:48 +0100 |
| commit | a028edeaa6f1c154f06e16440e46b0f876a64077 (patch) | |
| tree | a64b2689a21fa970254ddc3373e9dbd58dcb525c | |
| parent | fuzz: add fuzzer skeleton (diff) | |
| download | qemu-a028edeaa6f1c154f06e16440e46b0f876a64077.tar.gz qemu-a028edeaa6f1c154f06e16440e46b0f876a64077.tar.xz qemu-a028edeaa6f1c154f06e16440e46b0f876a64077.zip | |
exec: keep ram block across fork when using qtest
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>
| -rw-r--r-- | exec.c | 12 |
1 files changed, 10 insertions, 2 deletions
@@ -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); } } |