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From: Zenghui Yu <yuzenghui@huawei.com>
To: Auger Eric <eric.auger@redhat.com>
Cc: kvm@vger.kernel.org, maz@kernel.org, qemu-devel@nongnu.org,
	qemu-arm@nongnu.org, andre.przywara@arm.com, thuth@redhat.com,
	kvmarm@lists.cs.columbia.edu, eric.auger.pro@gmail.com
Subject: Re: [kvm-unit-tests PATCH v7 13/13] arm/arm64: ITS: pending table migration test
Date: Mon, 30 Mar 2020 21:17:47 +0800
Message-ID: <0e73fd13-ca18-2d17-2267-fd5d852e3ac8@huawei.com> (raw)
In-Reply-To: <ea74559c-2ab4-752c-e587-2bf40eab14b0@redhat.com>

On 2020/3/30 20:38, Auger Eric wrote:
> Hi Zenghui,

[...]

>>> +
>>> +    ptr = gicv3_data.redist_base[pe0] + GICR_PENDBASER;
>>> +    pendbaser = readq(ptr);
>>> +    writeq(pendbaser & ~GICR_PENDBASER_PTZ, ptr);
>>> +
>>> +    ptr = gicv3_data.redist_base[pe1] + GICR_PENDBASER;
>>> +    pendbaser = readq(ptr);
>>> +    writeq(pendbaser & ~GICR_PENDBASER_PTZ, ptr);
>>> +
>>> +    gicv3_lpi_rdist_enable(pe0);
>>> +    gicv3_lpi_rdist_enable(pe1);
>>
>> I don't know how the migration gets implemented in kvm-unit-tests.
>> But is there any guarantee that the LPIs will only be triggered on the
>> destination side? As once the EnableLPIs bit becomes 1, VGIC will start
>> reading the pending bit in guest memory and potentially injecting LPIs
>> into the target vcpu (in the source side).
> 
> I expect some LPIs to hit on source and some others to hit on the
> destination. To me, this does not really matter as long as the handlers
> gets called and accumulate the stats. Given the number of LPIs, we will
> at least test the migration of some of the pending bits and especially
> adjacent ones. It does work as it allows to test your fix:
> 
> ca185b260951  KVM: arm/arm64: vgic: Don't rely on the wrong pending table

Fair enough. Thanks for your explanation!


Zenghui

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Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-20  9:24 [kvm-unit-tests PATCH v7 00/13] arm/arm64: Add ITS tests Eric Auger
2020-03-20  9:24 ` [kvm-unit-tests PATCH v7 01/13] libcflat: Add other size defines Eric Auger
2020-03-20  9:24 ` [kvm-unit-tests PATCH v7 02/13] page_alloc: Introduce get_order() Eric Auger
2020-03-20  9:24 ` [kvm-unit-tests PATCH v7 03/13] arm/arm64: gic: Introduce setup_irq() helper Eric Auger
2020-03-20  9:24 ` [kvm-unit-tests PATCH v7 04/13] arm/arm64: gicv3: Add some re-distributor defines Eric Auger
2020-03-20  9:24 ` [kvm-unit-tests PATCH v7 05/13] arm/arm64: gicv3: Set the LPI config and pending tables Eric Auger
2020-03-20  9:24 ` [kvm-unit-tests PATCH v7 06/13] arm/arm64: ITS: Introspection tests Eric Auger
2020-03-30  8:30   ` Zenghui Yu
2020-03-30  8:46     ` Auger Eric
2020-03-30  9:11       ` Andrew Jones
2020-03-30  9:56         ` Auger Eric
2020-03-30 10:19           ` Andrew Jones
2020-03-30 10:24             ` Auger Eric
2020-03-30 12:20         ` Zenghui Yu
2020-03-20  9:24 ` [kvm-unit-tests PATCH v7 07/13] arm/arm64: ITS: its_enable_defaults Eric Auger
2020-03-20  9:24 ` [kvm-unit-tests PATCH v7 08/13] arm/arm64: ITS: Device and collection Initialization Eric Auger
2020-03-25  8:10   ` Zenghui Yu
2020-03-25 21:20     ` Auger Eric
2020-03-30  9:13       ` Andrew Jones
2020-03-20  9:24 ` [kvm-unit-tests PATCH v7 09/13] arm/arm64: ITS: Commands Eric Auger
2020-03-30  9:22   ` Zenghui Yu
2020-03-30  9:57     ` Auger Eric
2020-03-20  9:24 ` [kvm-unit-tests PATCH v7 10/13] arm/arm64: ITS: INT functional tests Eric Auger
2020-03-30 10:43   ` Zenghui Yu
2020-04-02  8:50     ` Auger Eric
2020-04-02 12:40       ` Zenghui Yu
2020-04-02 14:41         ` Andrew Jones
2020-03-20  9:24 ` [kvm-unit-tests PATCH v7 11/13] arm/run: Allow Migration tests Eric Auger
2020-03-20  9:24 ` [kvm-unit-tests PATCH v7 12/13] arm/arm64: ITS: migration tests Eric Auger
2020-03-30 10:55   ` Zenghui Yu
2020-03-20  9:24 ` [kvm-unit-tests PATCH v7 13/13] arm/arm64: ITS: pending table migration test Eric Auger
2020-03-30 12:06   ` Zenghui Yu
2020-03-30 12:38     ` Auger Eric
2020-03-30 13:17       ` Zenghui Yu [this message]

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