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From: Paolo Bonzini <pbonzini@redhat.com>
To: Vitaly Kuznetsov <vkuznets@redhat.com>, Ben Gardon <bgardon@google.com>
Cc: Peter Xu <peterx@redhat.com>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Peter Shier <pshier@google.com>, Oliver Upton <oupton@google.com>,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	linux-kselftest@vger.kernel.org
Subject: Re: [PATCH 2/3] kvm: mmu: Separate generating and setting mmio ptes
Date: Wed, 5 Feb 2020 15:37:18 +0100
Message-ID: <1a920cd0-530b-f380-a81a-da7cc6969f3e@redhat.com> (raw)
In-Reply-To: <87sgjpkve2.fsf@vitty.brq.redhat.com>

On 05/02/20 14:37, Vitaly Kuznetsov wrote:
>> +static void mark_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, u64 gfn,
>> +			   unsigned int access)
>> +{
>> +	u64 mask = make_mmio_spte(vcpu, gfn, access);
>> +	unsigned int gen = get_mmio_spte_generation(mask);
>> +
>> +	access = mask & ACC_ALL;
>> +
>>  	trace_mark_mmio_spte(sptep, gfn, access, gen);
> 'access' and 'gen' are only being used for tracing, would it rather make
> sense to rename&move it to the newly introduced make_mmio_spte()? Or do
> we actually need tracing for both?

You would have the same issue with sptep.

> Also, I dislike re-purposing function parameters.

Yes, "trace_mark_mmio_spte(sptep, gfn, mask & ACC_ALL, gen);" is
slightly better.

Paolo


  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-03 23:09 [PATCH 1/3] kvm: mmu: Replace unsigned with unsigned int for PTE access Ben Gardon
2020-02-03 23:09 ` [PATCH 2/3] kvm: mmu: Separate generating and setting mmio ptes Ben Gardon
2020-02-05 13:37   ` Vitaly Kuznetsov
2020-02-05 14:37     ` Paolo Bonzini [this message]
2020-02-03 23:09 ` [PATCH 3/3] kvm: mmu: Separate pte generation from set_spte Ben Gardon
2020-02-05 13:52   ` Vitaly Kuznetsov
2020-02-05 14:53     ` Paolo Bonzini
2020-02-05 12:00 ` [PATCH 1/3] kvm: mmu: Replace unsigned with unsigned int for PTE access Vitaly Kuznetsov
2020-02-05 16:46 ` Peter Xu

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