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From: "Roger Pau Monné" <roger.pau@citrix.com>
To: Jan Beulich <jbeulich@suse.com>
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
	Andrew Cooper <andrew.cooper3@citrix.com>, Wei Liu <wl@xen.org>,
	Kevin Tian <kevin.tian@intel.com>
Subject: Re: [PATCH v2 4/6] VT-d: restrict iommu_flush_all() to cache writeback
Date: Wed, 14 May 2025 16:44:32 +0200	[thread overview]
Message-ID: <aCSsUKy7xe7uaQHW@macbook.lan> (raw)
In-Reply-To: <bf99949c-0e09-13a5-3ad9-a6c26377bdbf@suse.com>

On Wed, May 03, 2023 at 11:46:11AM +0200, Jan Beulich wrote:
> We don't need to invalidate caches here; all we're after is that earlier
> writes have made it to main memory (and aiui even that just in case).
> 
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>

I wouldn't mind if you gated the flush to iommu_non_coherent, but
that's not very relevant if we plan to remove the call anyway.

Thanks, Roger.


  parent reply	other threads:[~2025-05-14 14:44 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-05-03  9:43 [PATCH v2 0/6] x86: reduce cache flushing overhead Jan Beulich
2023-05-03  9:44 ` [PATCH v2 1/6] x86: support cache-writeback in flush_area_local() et al Jan Beulich
2025-05-13 13:01   ` Roger Pau Monné
2023-05-03  9:45 ` [PATCH v2 2/6] x86/HVM: restrict guest-induced WBINVD to cache writeback Jan Beulich
2025-05-13 13:12   ` Andrew Cooper
2025-05-13 13:24     ` Jan Beulich
2025-05-13 13:41   ` Roger Pau Monné
2025-05-13 13:54     ` Jan Beulich
2025-05-14 11:30       ` Roger Pau Monné
2025-05-14 12:46         ` Jan Beulich
2025-05-14 14:42           ` Roger Pau Monné
2025-05-14 14:53             ` Jan Beulich
2023-05-03  9:45 ` [PATCH v2 3/6] x86/PV: restrict guest-induced WBINVD (or alike) " Jan Beulich
2023-05-03  9:46 ` [PATCH v2 4/6] VT-d: restrict iommu_flush_all() " Jan Beulich
2025-05-14 11:40   ` Roger Pau Monné
2025-05-14 12:49     ` Jan Beulich
2025-05-14 14:44   ` Roger Pau Monné [this message]
2025-05-14 14:57     ` Jan Beulich
2023-05-03  9:46 ` [PATCH v2 5/6] x86: FLUSH_CACHE -> FLUSH_CACHE_EVICT Jan Beulich
2025-05-14 11:44   ` Roger Pau Monné
2025-05-14 12:52     ` Jan Beulich
2025-05-14 14:45       ` Roger Pau Monné
2025-05-15  6:46         ` Jan Beulich
2023-05-03  9:47 ` [PATCH v2 6/6] x86/HVM: limit cache writeback overhead Jan Beulich
2025-05-14 13:00   ` Roger Pau Monné
2025-05-14 13:20     ` Jan Beulich
2025-05-14 15:12       ` Roger Pau Monné
2025-05-15  6:47         ` Jan Beulich
2025-05-15  8:09           ` Roger Pau Monné

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