Re: [PATCH 0/8] KVM: gmem: Adding hooks for SEV and TDX

[Sean Christopherson]

On Tue, 15 Aug 2023 10:18:47 -0700, isaku.yamahata@xxxxxxxxx wrote:
> From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
> 
> This patch series for KVM guest memfd is to have common code base for SEV and
> TDX.  Several minor fixes.  Based on this patch series, TDX KVM can defer page
> clearing without mmu lock.
> 
> Isaku Yamahata (6):
>   KVM: gmem: Make kvm_gmem_bind return EBADF on wrong fd
>   KVM: gmem: removed duplicated kvm_gmem_init()
>   KVM: gmem: Fix kvm_gmem_issue_arch_invalidate()
>   KVM: gmem: protect kvm_mmu_invalidate_end()
>   KVM: gmem: Avoid race with kvm_gmem_release and mmu notifier
>   RFC: KVM: gmem: Guarantee the order of destruction
> 
> [...]

Applied patches 1 and 2 to kvm-x86 guest_memfd.  I'll post the alternative
approach for fixing the unlocking bug next week (need to test, and I'm out of
time this week).

Regarding the initialize/invalidate hooks, I resurrected the discussion from
the previous version[*], I'd like to bottom out on a solution in that thread
before applying anything.

[*] https://lore.kernel.org/all/ZN%2FwY53TF2aOZtLu@xxxxxxxxxx

[1/8] KVM: gmem: Make kvm_gmem_bind return EBADF on wrong fd
      https://github.com/kvm-x86/linux/commit/07ac04fbefce
[2/8] KVM: gmem: removed duplicated kvm_gmem_init()
      https://github.com/kvm-x86/linux/commit/9ab46d91d5ea

--
https://github.com/kvm-x86/linux/tree/next
https://github.com/kvm-x86/linux/tree/fixes