From: "wangyanan (Y)" <wangyanan55@huawei.com>
To: Quentin Perret <qperret@google.com>
Cc: Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>,
"Alexandru Elisei" <alexandru.elisei@arm.com>,
<kvmarm@lists.cs.columbia.edu>,
<linux-arm-kernel@lists.infradead.org>, <kvm@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Gavin Shan <gshan@redhat.com>, <wanghaibin.wang@huawei.com>,
<zhukeqian1@huawei.com>, <yuzenghui@huawei.com>
Subject: Re: [PATCH v5 1/6] KVM: arm64: Introduce KVM_PGTABLE_S2_GUEST stage-2 flag
Date: Thu, 3 Jun 2021 20:36:02 +0800 [thread overview]
Message-ID: <2d5ed3b0-5e8f-572e-cee9-84d6c9d2410c@huawei.com> (raw)
In-Reply-To: <YLdg3K6m0P+cis2P@google.com>
Hi Quentin,
On 2021/6/2 18:43, Quentin Perret wrote:
> Hi Yanan,
>
> On Thursday 15 Apr 2021 at 19:50:27 (+0800), Yanan Wang wrote:
>> diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
>> index c3674c47d48c..a43cbe697b37 100644
>> --- a/arch/arm64/include/asm/kvm_pgtable.h
>> +++ b/arch/arm64/include/asm/kvm_pgtable.h
>> @@ -61,10 +61,12 @@ struct kvm_pgtable_mm_ops {
>> * @KVM_PGTABLE_S2_NOFWB: Don't enforce Normal-WB even if the CPUs have
>> * ARM64_HAS_STAGE2_FWB.
>> * @KVM_PGTABLE_S2_IDMAP: Only use identity mappings.
>> + * @KVM_PGTABLE_S2_GUEST: Whether the page-tables are guest stage-2.
>> */
>> enum kvm_pgtable_stage2_flags {
>> KVM_PGTABLE_S2_NOFWB = BIT(0),
>> KVM_PGTABLE_S2_IDMAP = BIT(1),
>> + KVM_PGTABLE_S2_GUEST = BIT(2),
> Assuming that we need this flag (maybe not given Marc's suggestion on
> another patch), I'd recommend re-naming it to explain _what_ it does,
> rather than _who_ is using it.
I agree with this.
> That's the principle we followed for e.g. KVM_PGTABLE_S2_IDMAP, so we
> should be consistent here as well.
But I think maybe we don't need the new flag anymore with Marc's suggestion.
Currently the CMOs right before installation or update of a PTE are
guest-specific.
So if we also take the new optional callbacks as guest specific, then a
new flag is
not necessary because we can check whether the callbacks have been
initialized
to determine if we are managing a guest S2 PTE.
Thanks,
Yanan
> Thanks,
> Quentin
> .
next prev parent reply other threads:[~2021-06-03 12:36 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-15 11:50 [PATCH v5 0/6] KVM: arm64: Improve efficiency of stage2 page table Yanan Wang
2021-04-15 11:50 ` [PATCH v5 1/6] KVM: arm64: Introduce KVM_PGTABLE_S2_GUEST stage-2 flag Yanan Wang
2021-06-02 10:43 ` Quentin Perret
2021-06-03 12:36 ` wangyanan (Y) [this message]
2021-04-15 11:50 ` [PATCH v5 2/6] KVM: arm64: Move D-cache flush to the fault handlers Yanan Wang
[not found] ` <877djc1sca.wl-maz@kernel.org>
2021-06-02 10:49 ` Quentin Perret
2021-06-03 12:33 ` wangyanan (Y)
2021-04-15 11:50 ` [PATCH v5 3/6] KVM: arm64: Add mm_ops member for structure stage2_attr_data Yanan Wang
2021-04-15 11:50 ` [PATCH v5 4/6] KVM: arm64: Provide invalidate_icache_range at non-VHE EL2 Yanan Wang
[not found] ` <875yyw1s73.wl-maz@kernel.org>
2021-06-03 12:34 ` wangyanan (Y)
2021-04-15 11:50 ` [PATCH v5 5/6] KVM: arm64: Move I-cache flush to the fault handlers Yanan Wang
2021-06-02 10:58 ` Quentin Perret
2021-06-03 12:35 ` wangyanan (Y)
2021-04-15 11:50 ` [PATCH v5 6/6] KVM: arm64: Distinguish cases of memcache allocations completely Yanan Wang
2021-06-02 11:07 ` Quentin Perret
2021-06-03 12:52 ` wangyanan (Y)
2021-05-12 12:54 ` [PATCH v5 0/6] KVM: arm64: Improve efficiency of stage2 page table wangyanan (Y)
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