From: "David Hildenbrand (Arm)" <david@kernel.org>
To: "Kevin Loughlin" <kevinloughlin@google.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
"Jason Wang" <jasowangio@gmail.com>,
"Eugenio Pérez" <eperezma@redhat.com>,
"Xuan Zhuo" <xuanzhuo@linux.alibaba.com>,
"Ard Biesheuvel" <ardb@kernel.org>,
"Kiryl Shutsemau" <kas@kernel.org>,
"Thomas Gleixner" <tglx@kernel.org>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
"Tom Lendacky" <thomas.lendacky@amd.com>,
"Ashish Kalra" <ashish.kalra@amd.com>,
"Michael Roth" <michael.roth@amd.com>,
"Rick Edgecombe" <rick.p.edgecombe@intel.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Vlastimil Babka" <vbabka@kernel.org>,
"Mike Rapoport" <rppt@kernel.org>,
"Suren Baghdasaryan" <surenb@google.com>,
"Michal Hocko" <mhocko@suse.com>,
"Brendan Jackman" <brendan.jackman@linux.dev>,
"Johannes Weiner" <hannes@cmpxchg.org>, "Zi Yan" <ziy@nvidia.com>,
"Alexander Duyck" <alexanderduyck@fb.com>
Cc: virtualization@lists.linux.dev, linux-coco@lists.linux.dev,
linux-efi@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Sidharth Telang <sidtelang@google.com>,
Punit Salian <psalian@google.com>,
Peter Gonda <pgonda@google.com>,
Ackerley Tng <ackerleytng@google.com>,
Jacky Li <jackyli@google.com>,
Steve Rutherford <srutherford@google.com>,
David Skidmore <davidskidmore@google.com>
Subject: Re: [PATCH 10/13] virtio_balloon: add higher-order page inflation
Date: Wed, 28 Oct 2026 09:58:59 +0100 [thread overview]
Message-ID: <2976bc2d-2642-4448-9c1f-ec13e67e45d5@kernel.org> (raw)
In-Reply-To: <20261027025616.1632690-11-kevinloughlin@google.com>
On 10/27/26 03:56, Kevin Loughlin wrote:
> In confidential computing guests requiring page state transitions,
> unaccepted memory tracking operates at the EFI unaccepted memory unit
> granularity (typically 2MB / order 9 on x86). Inflating the balloon
> with 4KB pages would prevent unaccepting the backing 2MB unit.
>
> Inflate balloon pages at unaccepted_memory_order() when
> virtballoon_cc_needs_state_transition() is true, while retaining
> order-0 allocations for non-CoCo guests and CoCo guests that do not
> use unaccepted memory transitions. When a higher-order balloon page
> spans more 4KB balloon PFNs than VIRTIO_BALLOON_ARRAY_PFNS_MAX (256),
> transmit its PFNs to the host in VIRTIO_BALLOON_ARRAY_PFNS_MAX chunks.
>
> Signed-off-by: Kevin Loughlin <kevinloughlin@google.com>
Sorry, not happening. There is no migration support for these (large) things,
and there likely won't be any time soon.
NAK
--
Cheers,
David
next prev parent reply other threads:[~2026-10-28 8:59 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-27 2:56 [PATCH 00/13] virtio_balloon, efi/unaccepted: support memory ballooning and free page reporting in CoCo guests Kevin Loughlin
2026-10-27 2:56 ` [PATCH 01/13] virtio_ring: support per-virtqueue DMA mapping ops Kevin Loughlin
2026-10-27 9:42 ` Michael S. Tsirkin
2026-10-27 2:56 ` [PATCH 02/13] virtio_balloon: add reporting_vq DMA map ops Kevin Loughlin
2026-10-27 2:56 ` [PATCH 03/13] x86/coco/sev: add snp_unaccept_memory() Kevin Loughlin
2026-10-27 2:56 ` [PATCH 04/13] x86/coco/sev: fix zeropad #VC on unaccepted memory Kevin Loughlin
2026-10-27 2:56 ` [PATCH 05/13] efi/libstub: start unaccepted bitmap at address 0 Kevin Loughlin
2026-10-27 2:56 ` [PATCH 06/13] efi/unaccepted: add mark_memory_unaccepted() Kevin Loughlin
2026-10-27 2:56 ` [PATCH 07/13] mm/page_alloc: allow lower-order unaccepted_pages Kevin Loughlin
2026-10-27 2:56 ` [PATCH 08/13] mm/page_alloc: route unaccepted isolated pages Kevin Loughlin
2026-10-27 2:56 ` [PATCH 09/13] mm/page_reporting: account for unaccepted memory Kevin Loughlin
2026-10-27 2:56 ` [PATCH 10/13] virtio_balloon: add higher-order page inflation Kevin Loughlin
2026-10-27 9:35 ` Michael S. Tsirkin
2026-10-27 9:36 ` Michael S. Tsirkin
2026-10-28 8:58 ` David Hildenbrand (Arm) [this message]
2026-10-27 2:56 ` [PATCH 11/13] virtio_balloon: unaccept free reporting ranges Kevin Loughlin
2026-10-27 2:56 ` [PATCH 12/13] virtio_balloon: unaccept inflated balloon pages Kevin Loughlin
2026-10-27 2:56 ` [PATCH 13/13] virtio_balloon: enforce ACCESS_PLATFORM in CoCo Kevin Loughlin
2026-10-27 10:29 ` [PATCH 00/13] virtio_balloon, efi/unaccepted: support memory ballooning and free page reporting in CoCo guests Michael S. Tsirkin
2026-10-27 20:39 ` Michael S. Tsirkin
2026-10-28 9:00 ` David Hildenbrand (Arm)
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