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mshv: clean up SynIC state on kexec for L1VH

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The reboot notifier that tears down the SynIC cpuhp state guards the
cleanup with hv_root_partition(), so on L1VH (where
hv_root_partition() is false) SINT0, SINT5, and SIRBP are never
cleaned up before kexec. The kexec'd kernel then inherits stale
unmasked SINTs and an enabled SIRBP pointing to freed memory.

Remove the hv_root_partition() guard so the cleanup runs for all
parent partitions.

Signed-off-by: Jork Loeser <jloeser@linux.microsoft.com>
Reviewed-by: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Reviewed-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Jork Loeser 2026-04-27 14:38:53 -07:00 committed by Wei Liu
parent f1a9e67c11
commit efe0fb8c3f
1 changed files with 0 additions and 3 deletions
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3
drivers/hv/mshv_synic.c
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@ -723,9 +723,6 @@ mshv_unregister_doorbell(u64 partition_id, int doorbell_portid)
static int mshv_synic_reboot_notify(struct notifier_block *nb,
unsigned long code, void *unused)
{
if (!hv_root_partition())
return 0;
cpuhp_remove_state(synic_cpuhp_online);
return 0;
}