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util/oslib-posix: Forward SIGBUS to MCE handler under Linux

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Temporarily modifying the SIGBUS handler is really nasty, as we might be
unlucky and receive an MCE SIGBUS while having our handler registered.
Unfortunately, there is no way around messing with SIGBUS when
MADV_POPULATE_WRITE is not applicable or not around.

Let's forward SIGBUS that don't belong to us to the already registered
handler and document the situation.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20211217134611.31172-8-david@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
David Hildenbrand 2021-12-17 14:46:10 +01:00 • committed by Michael S. Tsirkin
parent a960d6642d
commit 29b838c05d
2 changed files with 38 additions and 3 deletions
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4
softmmu/cpus.c
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@ -352,6 +352,10 @@ static void qemu_init_sigbus(void)
{
struct sigaction action;
/*
* ALERT: when modifying this, take care that SIGBUS forwarding in
* os_mem_prealloc() will continue working as expected.
*/
memset(&action, 0, sizeof(action));
action.sa_flags = SA_SIGINFO;
action.sa_sigaction = sigbus_handler;