From: Jan Beulich <jbeulich@suse.com>
To: "Roger Pau Monné" <roger.pau@citrix.com>
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
Wei Liu <wl@xen.org>, Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [Xen-devel] [PATCH v2 1/2] AMD/IOMMU: correct handling when XT's prereq features are unavailable
Date: Fri, 28 Feb 2020 14:13:45 +0100 [thread overview]
Message-ID: <a6a0791f-e9ed-46c4-4acd-91999a132a32@suse.com> (raw)
In-Reply-To: <20200228123331.GX24458@Air-de-Roger.citrite.net>
On 28.02.2020 13:41, Roger Pau Monné wrote:
> On Fri, Feb 28, 2020 at 01:10:59PM +0100, Jan Beulich wrote:
>> We should neither cause IOMMU initialization as a whole to fail in this
>> case (we should still be able to bring up the system in non-x2APIC or
>> x2APIC physical mode), nor should the remainder of the function be
>> skipped (as the main part of it won't get entered a 2nd time)
>
> I'm not sure I see why it won't get entered a second time. AFAICT
> init_done won't be set if amd_iommu_init fails, and hence will be
> called again with xt == false in iov_detect?
Not very far from the top of the function there is
/* Have we been here before? */
if ( ivrs_bdf_entries )
return 0;
Hence me saying "main part" rather than "the function as a whole".
Jan
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next prev parent reply other threads:[~2020-02-28 13:14 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-28 12:09 [Xen-devel] [PATCH v2 0/2] AMD/IOMMU: improve x2APIC handling when XT is unavailable Jan Beulich
2020-02-28 12:10 ` [Xen-devel] [PATCH v2 1/2] AMD/IOMMU: correct handling when XT's prereq features are unavailable Jan Beulich
2020-02-28 12:38 ` Andrew Cooper
2020-02-28 12:41 ` Roger Pau Monné
2020-02-28 12:45 ` Jan Beulich
2020-02-28 13:13 ` Jan Beulich [this message]
2020-02-28 14:46 ` Roger Pau Monné
2020-02-28 12:12 ` [Xen-devel] [PATCH v2 2/2] AMD/IOMMU: without XT, x2APIC needs to be forced into physical mode Jan Beulich
2020-02-28 12:31 ` Roger Pau Monné
2020-02-28 12:39 ` Jan Beulich
2020-02-28 15:21 ` Roger Pau Monné
2020-03-03 16:05 ` Jan Beulich
2020-03-03 16:11 ` Jan Beulich
2020-02-28 14:48 ` Andrew Cooper
2020-02-28 15:04 ` Jan Beulich
2020-03-09 8:58 ` Jan Beulich
2020-03-10 1:10 ` Tian, Kevin
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