From: Sean Christopherson <seanjc@google.com>
To: Ben Gardon <bgardon@google.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
Paolo Bonzini <pbonzini@redhat.com>,
Peter Shier <pshier@google.com>,
Jim Mattson <jmattson@google.com>
Subject: Re: [PATCH v2 3/4] KVM: x86/mmu: Factor out tdp_iter_return_to_root
Date: Mon, 15 Mar 2021 15:24:48 -0700 [thread overview]
Message-ID: <YE/esByaQWd3QV2U@google.com> (raw)
In-Reply-To: <20210315182643.2437374-4-bgardon@google.com>
On Mon, Mar 15, 2021, Ben Gardon wrote:
> In tdp_mmu_iter_cond_resched there is a call to tdp_iter_start which
> causes the iterator to continue its walk over the paging structure from
> the root. This is needed after a yield as paging structure could have
> been freed in the interim.
>
> The tdp_iter_start call is not very clear and something of a hack. It
> requires exposing tdp_iter fields not used elsewhere in tdp_mmu.c and
> the effect is not obvious from the function name. Factor a more aptly
> named function out of tdp_iter_start and call it from
> tdp_mmu_iter_cond_resched and tdp_iter_start.
>
> No functional change intended.
>
> Signed-off-by: Ben Gardon <bgardon@google.com>
> ---
Very nice, sooo much easier to read.
Reviewed-by: Sean Christopherson <seanjc@google.com>
next prev parent reply other threads:[~2021-03-15 22:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-15 18:26 [PATCH v2 0/4] Fix RCU warnings in TDP MMU Ben Gardon
2021-03-15 18:26 ` [PATCH v2 1/4] KVM: x86/mmu: Fix RCU usage in handle_removed_tdp_mmu_page Ben Gardon
2021-03-15 18:26 ` [PATCH v2 2/4] KVM: x86/mmu: Fix RCU usage when atomically zapping SPTEs Ben Gardon
2021-03-15 22:26 ` Sean Christopherson
2021-03-15 18:26 ` [PATCH v2 3/4] KVM: x86/mmu: Factor out tdp_iter_return_to_root Ben Gardon
2021-03-15 22:24 ` Sean Christopherson [this message]
2021-03-15 18:26 ` [PATCH v2 4/4] KVM: x86/mmu: Store the address space ID in the TDP iterator Ben Gardon
2021-03-15 22:23 ` Sean Christopherson
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