linux-kernel - Re: [PATCH v4 0/4] KVM: x86: Dynamically allocate hashed page list

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Message-ID: <175079268655.517596.11530108670607154610.b4-ty@google.com>
Date: Tue, 24 Jun 2025 12:38:38 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Vipin Sharma <vipinsh@...gle.com>, James Houghton <jthoughton@...gle.com>
Subject: Re: [PATCH v4 0/4] KVM: x86: Dynamically allocate hashed page list

On Thu, 22 May 2025 17:11:34 -0700, Sean Christopherson wrote:
> Allocate the hashed list of shadow pages dynamically (separate from
> struct kvm), and on-demand.  The hashed list is 32KiB, i.e. absolutely
> belongs in a separate allocation, and is worth skipping if KVM isn't
> shadowing guest PTEs for the VM.
> 
> I double checked that padding kvm_arch with a 4KiB array trips the assert,
> but padding with 2KiB does not.  So knock on wood, I finally got the assert
> right.  Maybe.
> 
> [...]

Applied to kvm-x86 mmu, thanks!

[1/4] KVM: TDX: Move TDX hardware setup from main.c to tdx.c
      https://github.com/kvm-x86/linux/commit/1f287a4e7b90
[2/4] KVM: x86/mmu: Dynamically allocate shadow MMU's hashed page list
      https://github.com/kvm-x86/linux/commit/02c6bea57d0d
[3/4] KVM: x86: Use kvzalloc() to allocate VM struct
      https://github.com/kvm-x86/linux/commit/97ad7dd0e53d
[4/4] KVM: x86/mmu: Defer allocation of shadow MMU's hashed page list
      https://github.com/kvm-x86/linux/commit/59ce4bd2996b

--
https://github.com/kvm-x86/kvm-unit-tests/tree/next