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KVM: x86/mmu: Check for usable TDP MMU root while holding mmu_lock fo…
…r read When allocating a new TDP MMU root, check for a usable root while holding mmu_lock for read and only acquire mmu_lock for write if a new root needs to be created. There is no need to serialize other MMU operations if a vCPU is simply grabbing a reference to an existing root, holding mmu_lock for write is "necessary" (spoiler alert, it's not strictly necessary) only to ensure KVM doesn't end up with duplicate roots. Allowing vCPUs to get "new" roots in parallel is beneficial to VM boot and to setups that frequently delete memslots, i.e. which force all vCPUs to reload all roots. Link: https://lore.kernel.org/r/20240111020048.844847-7-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
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