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| author | Sean Christopherson <seanjc@google.com> | 2025-03-15 06:10:48 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2025-04-28 14:40:20 +0300 |
| commit | 94c721ea03c7078163f41dbaa101ac721ddac329 (patch) | |
| tree | 600ce6c7fee3fb23b90de9a6797688d7f7370d0c | |
| parent | 8ffd015db85fea3e15a77027fda6c02ced4d2444 (diff) | |
| download | linux-94c721ea03c7078163f41dbaa101ac721ddac329.tar.xz | |
iommu/amd: Ensure GA log notifier callbacks finish running before module unload
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>
| -rw-r--r-- | drivers/iommu/amd/iommu.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c index be8761bbef0f..15e334264881 100644 --- a/drivers/iommu/amd/iommu.c +++ b/drivers/iommu/amd/iommu.c @@ -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); |