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4c08e737f0
Hoist the acquisition of ir_list_lock from avic_update_iommu_vcpu_affinity() to its two callers, avic_vcpu_load() and avic_vcpu_put(), specifically to encapsulate the write to the vCPU's entry in the AVIC Physical ID table. This will allow a future fix to pull information from the Physical ID entry when updating the IRTE, without potentially consuming stale information, i.e. without racing with the vCPU being (un)loaded. Add a comment to call out that ir_list_lock does NOT protect against multiple writers, specifically that reading the Physical ID entry in avic_vcpu_put() outside of the lock is safe. To preserve some semblance of independence from ir_list_lock, keep the READ_ONCE() in avic_vcpu_load() even though acuiring the spinlock effectively ensures the load(s) will be generated after acquiring the lock. Cc: stable@vger.kernel.org Tested-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com> Reviewed-by: Joao Martins <joao.m.martins@oracle.com> Link: https://lore.kernel.org/r/20230808233132.2499764-2-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> |
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|---|---|---|
| .. | ||
| avic.c | ||
| hyperv.c | ||
| hyperv.h | ||
| nested.c | ||
| pmu.c | ||
| sev.c | ||
| svm.c | ||
| svm.h | ||
| svm_onhyperv.c | ||
| svm_onhyperv.h | ||
| svm_ops.h | ||
| vmenter.S | ||