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Sampat" Subject: Re: [PATCH v2 1/2] mm/memory_hotplug: Add support to accept memory during hot-add To: "David Hildenbrand (Red Hat)" , linux-mm@kvack.org, linux-coco@lists.linux.dev, x86@kernel.org, linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, kas@kernel.org, ardb@kernel.org, akpm@linux-foundation.org, osalvador@suse.de, thomas.lendacky@amd.com, michael.roth@amd.com References: <20260112202300.43546-1-prsampat@amd.com> <20260112202300.43546-2-prsampat@amd.com> <4f2c6106-9cc1-4196-8b20-83b297ae7195@kernel.org> Content-Language: en-US In-Reply-To: <4f2c6106-9cc1-4196-8b20-83b297ae7195@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SN7P220CA0016.NAMP220.PROD.OUTLOOK.COM (2603:10b6:806:123::21) To CH3PR12MB8660.namprd12.prod.outlook.com (2603:10b6:610:177::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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 /gslRX1x 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 1/14/26 4:30 AM, David Hildenbrand (Red Hat) wrote: > On 1/12/26 21:22, Pratik R. Sampat wrote: >> Confidential computing guests require memory to be accepted before use. >> The unaccepted memory bitmap maintained by firmware does not track >> hotplugged memory ranges. >> >> Call arch_accept_memory() during the hot-add path to explicitly validate >> and transition the newly added memory to a private state, making it >> usable by the guest. >> >> Signed-off-by: Pratik R. Sampat >> --- >>   mm/memory_hotplug.c | 4 ++++ >>   1 file changed, 4 insertions(+) >> >> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c >> index a63ec679d861..8cfbf0541430 100644 >> --- a/mm/memory_hotplug.c >> +++ b/mm/memory_hotplug.c >> @@ -38,6 +38,7 @@ >>   #include >>     #include >> +#include >>     #include "internal.h" >>   #include "shuffle.h" >> @@ -1567,6 +1568,9 @@ int add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags) >>       if (!strcmp(res->name, "System RAM")) >>           firmware_map_add_hotplug(start, start + size, "System RAM"); >>   +    if (IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) >> +        arch_accept_memory(start, start + size); >> + >>       /* device_online() will take the lock when calling online_pages() */ >>       mem_hotplug_done(); >>   > > As discussed, for things like virtio-mem or the HV-balloon this might be the wrong thing to do, but I don't expect these mechanisms to be used in CoCo environments just yet (and doing so would require enabling work for them). > Ack. > So I'm fine with this for now. > Thanks!