From: Jan Beulich <jbeulich@suse.com>
To: Julien Grall <julien@xen.org>
Cc: hongyxia@amazon.co.uk, iwj@xenproject.org,
Julien Grall <jgrall@amazon.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Kevin Tian <kevin.tian@intel.com>, Paul Durrant <paul@xen.org>,
xen-devel@lists.xenproject.org
Subject: Re: [PATCH for-4.15 v5 2/3] xen/x86: iommu: Ignore IOMMU mapping requests when a domain is dying
Date: Fri, 26 Feb 2021 14:30:37 +0100 [thread overview]
Message-ID: <1a386635-9c7d-3880-7e99-d87722fe5075@suse.com> (raw)
In-Reply-To: <20210226105640.12037-3-julien@xen.org>
On 26.02.2021 11:56, Julien Grall wrote:
> From: Julien Grall <jgrall@amazon.com>
>
> The new x86 IOMMU page-tables allocator will release the pages when
> relinquishing the domain resources. However, this is not sufficient
> when the domain is dying because nothing prevents page-table to be
> allocated.
>
> As the domain is dying, it is not necessary to continue to modify the
> IOMMU page-tables as they are going to be destroyed soon.
>
> At the moment, page-table allocates will only happen when iommu_map().
> So after this change there will be no more page-table allocation
> happening because we don't use superpage mappings yet when not sharing
> page tables.
>
> In order to observe d->is_dying correctly, we need to rely on per-arch
> locking, so the check to ignore IOMMU mapping is added on the per-driver
> map_page() callback.
>
> Signed-off-by: Julien Grall <jgrall@amazon.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Does this also want a Fixes: tag (the same as patch 1)?
Jan
next prev parent reply other threads:[~2021-02-26 13:30 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-26 10:56 [PATCH for-4.15 v5 0/3] xen/iommu: Collection of bug fixes for IOMMU teardown Julien Grall
2021-02-26 10:56 ` [PATCH for-4.15 v5 1/3] xen/iommu: x86: Don't try to free page tables is the IOMMU is not enabled Julien Grall
2021-02-26 13:27 ` Jan Beulich
2021-02-26 10:56 ` [PATCH for-4.15 v5 2/3] xen/x86: iommu: Ignore IOMMU mapping requests when a domain is dying Julien Grall
2021-02-26 13:30 ` Jan Beulich [this message]
2021-03-01 9:21 ` Julien Grall
2021-03-01 2:52 ` Tian, Kevin
2021-02-26 10:56 ` [PATCH for-4.15 v5 3/3] xen/iommu: x86: Clear the root page-table before freeing the page-tables Julien Grall
2021-03-01 2:54 ` Tian, Kevin
2021-03-02 9:56 ` [PATCH for-4.15 v5 0/3] xen/iommu: Collection of bug fixes for IOMMU teardown Julien Grall
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