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From: Jan Beulich <jbeulich@suse.com>
To: Teddy Astie <teddy.astie@vates.tech>
Cc: "Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Roger Pau Monné" <roger@xenproject.org>,
	xen-devel@lists.xenproject.org
Subject: Re: [PATCH 5/5] vtd: Move intremap table to xenheap
Date: Wed, 5 Aug 2026 11:44:50 +0200	[thread overview]
Message-ID: <451978a5-7dfd-4b91-a241-eb13caf6d394@suse.com> (raw)
In-Reply-To: <1785319343.8631fc262581453bbf619ec5b2062170.19fad5345fc000e099@vates.tech>

On 29.07.2026 11:59, Teddy Astie wrote:
> Interrupt remapping entries often needs to be accessed, and we're creating
> pointers to it on demand, which brings a lot of complexity (e.g
> GET_IREMAP_ENTRY() macro), move it to xenheap such that it's persistently
> mapped and we won't have to worry about mapping and unmapping individual
> intremap table pages.

Afaic: No movement from domheap to xenheap except for _very_ good reasons.
For the case here that is - maybe establish a permanent mapping using
vmap(), but no change in where the memory is to come from. Whether such a
permanent mapping is really worthwhile may also want supporting by numbers.
You say "often", but you don't qualify / quantify this any further.

Jan


  reply	other threads:[~2026-08-05  9:45 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-29  9:59 [PATCH 0/5] Misc VT-d changes Teddy Astie
2026-07-29  9:59 ` [PATCH 2/5] vtd: Ensure context entry is cleared properly Teddy Astie
2026-08-04 16:04   ` Jan Beulich
2026-07-29  9:59 ` [PATCH 3/5] vtd: Print originating iommu on faults Teddy Astie
2026-08-05  9:31   ` Jan Beulich
2026-07-29  9:59 ` [PATCH 4/5] vtd: Don't disable hwdom passthrough on unhandled SAGAW bits Teddy Astie
2026-08-05  9:41   ` Jan Beulich
2026-07-29  9:59 ` [PATCH 5/5] vtd: Move intremap table to xenheap Teddy Astie
2026-08-05  9:44   ` Jan Beulich [this message]
2026-08-05 10:06     ` Andrew Cooper
2026-08-05 12:42       ` Teddy Astie
2026-07-29 10:05 ` [RESEND PATCH 1/5] vtd: Ensure root entry is updated consistently Teddy Astie
2026-08-04 15:58   ` Jan Beulich
2026-08-05 13:03     ` Teddy Astie

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