linux-kernel - Re: [PATCH v2 10/18] KVM: x86/mmu: load new PGD after the shadow MMU is initialized

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Message-ID: <YhAyyq7Atsdu4kTR@google.com>
Date:   Fri, 18 Feb 2022 23:59:06 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v2 10/18] KVM: x86/mmu: load new PGD after the shadow MMU
 is initialized

On Thu, Feb 17, 2022, Paolo Bonzini wrote:
> Now that __kvm_mmu_new_pgd does not look at the MMU's root_level and
> shadow_root_level anymore, pull the PGD load after the initialization of
> the shadow MMUs.
> 
> Besides being more intuitive, this enables future simplifications
> and optimizations because it's not necessary anymore to compute the
> role outside kvm_init_mmu.  In particular, kvm_mmu_reset_context was not
> attempting to use a cached PGD to avoid having to figure out the new role.
> It will soon be able to follow what nested_{vmx,svm}_load_cr3 are doing,
> and avoid unloading all the cached roots.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

Reviewed-by: Sean Christopherson <seanjc@...gle.com>