From: Paolo Bonzini <pbonzini@redhat.com>
Date: Mon, 11 Mar 2024 14:29:22 +0000 (-0400)
Subject: Merge tag 'kvm-x86-mmu-6.9' of https://github.com/kvm-x86/linux into HEAD
X-Git-Tag: v6.9-rc1~91^2~5
X-Git-Url: http://git.ipfire.org/?p=thirdparty%2Fkernel%2Fstable.git;a=commitdiff_plain;h=41ebae2ecd1496aaf72596af9f37529d62a160ab

Merge tag 'kvm-x86-mmu-6.9' of https://github.com/kvm-x86/linux into HEAD

KVM x86 MMU changes for 6.9:

 - Clean up code related to unprotecting shadow pages when retrying a guest
   instruction after failed #PF-induced emulation.

 - Zap TDP MMU roots at 4KiB granularity to minimize the delay in yielding if
   a reschedule is needed, e.g. if a high priority task needs to run.  Because
   KVM doesn't support yielding in the middle of processing a zapped non-leaf
   SPTE, zapping at 1GiB granularity can result in multi-millisecond lag when
   attempting to schedule in a high priority.

 - Rework TDP MMU root unload, free, and alloc to run with mmu_lock held for
   read, e.g. to avoid serializing vCPUs when userspace deletes a memslot.

 - Allocate write-tracking metadata on-demand to avoid the memory overhead when
   running kernels built with KVMGT support (external write-tracking enabled),
   but for workloads that don't use nested virtualization (shadow paging) or
   KVMGT.
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41ebae2ecd1496aaf72596af9f37529d62a160ab