d269845159
Because of the KVM shadow page table implementation, modifications made to guest page tables from host mode may not be syncronized correctly, resulting in undefined behavior. This is a KVM bug: page table pages should also be tracked for host modifications and resynced appropriately (e.g. the guest could "DMA" into a page table page in theory). However, since we can't rely on this being fixed everywhere, workaround the issue by forcing page table modifications to be in guest mode. This will generally be the case anyways, but now if an exit occurs during modifications, we will re-enter and perform the modifications again. PiperOrigin-RevId: 199587895 Change-Id: I83c20b4cf2a9f9fa56f59f34939601dd34538fb0 |
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