From: Wei Liu <wl@xen.org>
To: Paul Durrant <paul@xen.org>
Cc: xen-devel@lists.xenproject.org,
Paul Durrant <pdurrant@amazon.com>,
Ian Jackson <iwj@xenproject.org>, Wei Liu <wl@xen.org>,
Anthony PERARD <anthony.perard@citrix.com>
Subject: Re: [PATCH 1/5] libxl: remove separate calculation of IOMMU memory overhead
Date: Thu, 8 Oct 2020 13:07:33 +0000 [thread overview]
Message-ID: <20201008130733.7pu73mu4iqjj2svd@liuwe-devbox-debian-v2> (raw)
In-Reply-To: <20201005094905.2929-2-paul@xen.org>
On Mon, Oct 05, 2020 at 10:49:01AM +0100, Paul Durrant wrote:
> From: Paul Durrant <pdurrant@amazon.com>
>
> When using 'shared_pt' mode the IOMMU is using the EPT PTEs. In 'sync_pt'
> mode these PTEs are instead replicated for the IOMMU to use. Hence, it is
> fairly clear that the memory overhead in this mode is essentially another
> copy of the P2M.
>
> This patch removes the independent calculation done in
> libxl__get_required_iommu_memory() and instead simply uses 'shadow_memkb'
> as the value of the IOMMU overhead since this is the estimated size of
> the P2M.
>
> Signed-off-by: Paul Durrant <pdurrant@amazon.com>
Acked-by: Wei Liu <wl@xen.org>
next prev parent reply other threads:[~2020-10-08 13:07 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-05 9:49 [PATCH 0/5] iommu page-table memory pool Paul Durrant
2020-10-05 9:49 ` [PATCH 1/5] libxl: remove separate calculation of IOMMU memory overhead Paul Durrant
2020-10-08 13:07 ` Wei Liu [this message]
2020-10-05 9:49 ` [PATCH 2/5] iommu / domctl: introduce XEN_DOMCTL_iommu_ctl Paul Durrant
2020-10-16 15:47 ` Julien Grall
2020-10-19 7:23 ` Paul Durrant
2020-10-19 7:29 ` Jan Beulich
2020-10-19 7:32 ` Paul Durrant
2020-10-20 17:17 ` Julien Grall
2020-10-05 9:49 ` [PATCH 3/5] libxl / iommu / domctl: introduce XEN_DOMCTL_IOMMU_SET_ALLOCATION Paul Durrant
2020-10-08 13:08 ` Wei Liu
2020-10-16 15:54 ` Julien Grall
2020-10-19 7:30 ` Paul Durrant
2020-10-30 16:45 ` Jan Beulich
2020-10-05 9:49 ` [PATCH 4/5] iommu: set 'hap_pt_share' and 'need_sync' flags earlier in iommu_domain_init() Paul Durrant
2020-10-16 16:07 ` Julien Grall
2020-10-30 16:11 ` Jan Beulich
2020-10-05 9:49 ` [PATCH 5/5] x86 / iommu: create a dedicated pool of page-table pages Paul Durrant
2020-10-30 16:43 ` Jan Beulich
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