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[2003:d8:2f2b:b200:607d:d3d2:3271:1be0]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-458953cfd10sm267154515e9.21.2025.08.05.07.26.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 Aug 2025 07:26:21 -0700 (PDT) Message-ID: <57325473-42ba-4523-974f-3d7889c4acb5@redhat.com> Date: Tue, 5 Aug 2025 16:26:20 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [GIT PULL] VFIO updates for v6.17-rc1 To: Jason Gunthorpe Cc: Linus Torvalds , Alex Williamson , "kvm@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "lizhe.67@bytedance.com" References: <20250804185306.6b048e7c.alex.williamson@redhat.com> <0a2e8593-47c6-4a17-b7b0-d4cb718b8f88@redhat.com> <20250805132558.GA365447@nvidia.com> <00999740-d762-488a-a946-0c10589df146@redhat.com> <20250805135505.GL184255@nvidia.com> <44157147-c424-4cc0-9302-ccf42c648247@redhat.com> <20250805142028.GM184255@nvidia.com> <57582464-cfd5-47f5-877d-88918ffa2ec0@redhat.com> <20250805142446.GN184255@nvidia.com> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 05.08.25 16:24, Jason Gunthorpe wrote: > On Tue, Aug 05, 2025 at 04:22:32PM +0200, David Hildenbrand wrote: >> On 05.08.25 16:20, Jason Gunthorpe wrote: >>> On Tue, Aug 05, 2025 at 04:10:45PM +0200, David Hildenbrand wrote: >>>> There are some weird scenarios where you hotplug memory after boot memory, >>>> and suddenly you can runtime-allocate a gigantic folio that spans both >>>> ranges etc. >>> >>> I was thinking we'd forbid this directly, but yes it is a another new >>> check. >>> >>>> So while related, the corner cases are all a bit nasty, and just forbidding >>>> folios to span a memory section on these problematic configs (sparse >>>> !vmemmap) sounds interesting. >>> >>> Indeed, this just sounds like forcing MAX_ORDER to be no larger than >>> the section size for this old mode? >> >> MAX_ORDER is always limited to the section size already. >> >> MAX_ORDER is only about buddy allocations. What hugetlb and dax do is >> independent of MAX_ORDER. > > Oh I thought it limited folios too. > > Still same idea is to have a MAX_FOLIO_ORDER for that case. Yes. Usually unlimited, except we are in this weird config state. -- Cheers, David / dhildenb