linux-kernel - Re: [PATCH 17/22] kvm: mmu: Support dirty logging for the TDP MMU

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Message-ID: <48c927aa-5902-138a-eb93-891325976edd@redhat.com>
Date:   Wed, 30 Sep 2020 20:08:52 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Ben Gardon <bgardon@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Cannon Matthews <cannonmatthews@...gle.com>,
        Peter Xu <peterx@...hat.com>, Peter Shier <pshier@...gle.com>,
        Peter Feiner <pfeiner@...gle.com>,
        Junaid Shahid <junaids@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Yulei Zhang <yulei.kernel@...il.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>
Subject: Re: [PATCH 17/22] kvm: mmu: Support dirty logging for the TDP MMU

On 30/09/20 20:04, Sean Christopherson wrote:
>> +	for_each_tdp_mmu_root(kvm, root) {
>> +		root_as_id = kvm_mmu_page_as_id(root);
>> +		if (root_as_id != slot->as_id)
>> +			continue;
> This pattern pops up quite a few times, probably worth adding
> 
> #define for_each_tdp_mmu_root_using_memslot(...)	\
> 	for_each_tdp_mmu_root(...)			\
> 		if (kvm_mmu_page_as_id(root) != slot->as_id) {
> 		} else
> 

It's not really relevant that it's a memslot, but

	for_each_tdp_mmu_root_using_as_id

makes sense too.

Paolo