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 mWCEYaqY 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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 1/13/2026 4:28 AM, Kiryl Shutsemau wrote: > On Mon, Jan 12, 2026 at 02:23:00PM -0600, Pratik R. Sampat wrote: >> Transition memory to the shared state during a hot-remove operation so >> that it can be re-used by the hypervisor. This also applies when memory >> is intended to be hotplugged back in later, as those pages will need to >> be re-accepted after crossing the trust boundary. > > Hm. What happens when we hot-remove memory that was there at the boot > and there's bitmap space for it? > While hotplug ranges gotten from SRAT don't seem to overlap with the conventional ranges in the unaccepted table, EFI_MEMORY_HOT_PLUGGABLE attribute could indicate boot time memory that could be hot-removed. I could potentially unset the bitmap first, if the bit exists and then unaccept. Similarly, I could also check if the bitmap is large enough to set the bit before I call arch_accept_memory() (This may not really be needed though). > Also, I'm not sure why it is needed. At least in TDX case, VMM can pull > the memory from under guest at any time without a warning. Coverting > memory to shared shouldn't make a difference as along as re-adding the > same GPA range triggers accept. > That makes sense. The only scenario where we could run into trouble on SNP platforms is when we redo a qemu device_add after a device_del without first removing the memory object entirely since same-state transitions result in guest termination. This means we must always follow a device_del with an object_del on removal. Otherwise, the onus would then be on the VMM to transition the memory back to shared before re-adding it to the guest. However, if this flow is not a concern to begin with then I could probably just drop this patch? --Pratik