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From: Christoffer Dall <cdall@linaro.org>
To: Eric Auger <eric.auger@redhat.com>
Cc: eric.auger.pro@gmail.com, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org, marc.zyngier@arm.com,
	peter.maydell@linaro.org, andre.przywara@arm.com,
	wanghaibin.wang@huawei.com, wu.wubin@huawei.com
Subject: Re: [PATCH 7/9] KVM: arm/arm64: vgic-its: free caches when GITS_BASER Valid bit is cleared
Date: Mon, 16 Oct 2017 11:26:24 +0200	[thread overview]
Message-ID: <20171016092624.GA1845@lvm> (raw)
In-Reply-To: <1506346478-1631-8-git-send-email-eric.auger@redhat.com>

Hi Eric,

On Mon, Sep 25, 2017 at 03:34:36PM +0200, Eric Auger wrote:
> When the GITS_BASER<n>.Valid gets cleared, the data structures in
> guest RAM are not provisionned anymore. The device, collection
> and LPI lists stored in the in-kernel ITS represent the same
> information in some form of cache. So let's void the cache.

Just a thought.  What about the opposite case, if the BASERs were
previously not valid, and then become valid, is the ITS expected restore
the state from memory?

Thanks,
-Christoffer

  reply	other threads:[~2017-10-16  9:26 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-25 13:34 [PATCH 0/9] vITS Migration fixes and reset Eric Auger
2017-09-25 13:34 ` [PATCH 1/9] KVM: arm/arm64: vgic-its: fix return value for restore Eric Auger
2017-09-25 13:34 ` [PATCH 2/9] KVM: arm/arm64: vgic-its: Always allow clearing GITS_CREADR/CWRITER Eric Auger
2017-09-25 13:34 ` [PATCH 3/9] KVM: arm/arm64: vgic-its: Improve error reporting on device table save Eric Auger
2017-09-25 13:34 ` [PATCH 4/9] KVM: arm/arm64: vgic-its: Check GITS_BASER Valid bit before saving tables Eric Auger
2017-09-25 13:34 ` [PATCH 5/9] KVM: arm/arm64: vgic-its: Check GITS_CBASER validity before processing commands Eric Auger
2017-09-25 13:34 ` [PATCH 6/9] KVM: arm/arm64: vgic-its: new helper functions to free the caches Eric Auger
2017-09-25 13:34 ` [PATCH 7/9] KVM: arm/arm64: vgic-its: free caches when GITS_BASER Valid bit is cleared Eric Auger
2017-10-16  9:26   ` Christoffer Dall [this message]
2017-10-16  9:44     ` Auger Eric
2017-10-16  9:59       ` Christoffer Dall
2017-10-16  9:47     ` Peter Maydell
2017-10-16 10:01       ` Christoffer Dall
2017-09-25 13:34 ` [PATCH 8/9] KVM: arm/arm64: Document KVM_DEV_ARM_ITS_CTRL_RESET Eric Auger
2017-09-25 13:34 ` [PATCH 9/9] KVM: arm/arm64: vgic-its: Implement KVM_DEV_ARM_ITS_CTRL_RESET Eric Auger

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