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plugins: add [pre|post]fork helpers to linux-user

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Special care needs to be taken in ensuring locks are in a consistent
state across fork events. Add helpers so the plugin system can ensure
that.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Fixes: https://gitlab.com/qemu-project/qemu/-/issues/358
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Tested-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20221004115221.2174499-1-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2022-10-04 12:52:21 +01:00
parent 37e62694e4
commit f7e15affa8
3 changed files with 46 additions and 0 deletions
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2
linux-user/main.c
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@ -142,10 +142,12 @@ void fork_start(void)
start_exclusive();
mmap_fork_start();
cpu_list_lock();
qemu_plugin_user_prefork_lock();
}
void fork_end(int child)
{
qemu_plugin_user_postfork(child);
mmap_fork_end(child);
if (child) {
CPUState *cpu, *next_cpu;