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On Intel, new noncoherent DMA mem flag can be set to allow KVM to recognize guest cache setting for EPT, which allows WC attribute to be applied to ensure guest memory access is synchronized in noncoherent DMA. Unlike previous POC for new device attribute, this uses new added flag for mem slot. BUG=b:316337317 TEST=cargo build and run GPU workload Change-Id: If16d61031bdb2cf0252a57e99d4b6725a89dd38a Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/5171312 Reviewed-by: Frederick Mayle <fmayle@google.com> Reviewed-by: Daniel Verkamp <dverkamp@chromium.org> Commit-Queue: Stanisław Kardach <skardach@google.com> |
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