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iommu/amd: Ensure GA log notifier callbacks finish running before module unload

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Synchronize RCU when unregistering KVM's GA log notifier to ensure all
in-flight interrupt handlers complete before KVM-the module is unloaded.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20250315031048.2374109-1-seanjc@google.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Sean Christopherson 2025-03-14 20:10:48 -07:00 committed by Joerg Roedel
parent 8ffd015db8
commit 94c721ea03
1 changed files with 8 additions and 0 deletions
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8
drivers/iommu/amd/iommu.c
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@ -982,6 +982,14 @@ int amd_iommu_register_ga_log_notifier(int (*notifier)(u32))
{
iommu_ga_log_notifier = notifier;
/*
* Ensure all in-flight IRQ handlers run to completion before returning
* to the caller, e.g. to ensure module code isn't unloaded while it's
* being executed in the IRQ handler.
*/
if (!notifier)
synchronize_rcu();
return 0;
}
EXPORT_SYMBOL(amd_iommu_register_ga_log_notifier);