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BY5PR12MB4116.namprd12.prod.outlook.com (2603:10b6:a03:210::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8293.16; Fri, 27 Dec 2024 04:21:16 +0000 Received: from LV3PR12MB9213.namprd12.prod.outlook.com ([fe80::dcd3:4b39:8a3a:869a]) by LV3PR12MB9213.namprd12.prod.outlook.com ([fe80::dcd3:4b39:8a3a:869a%5]) with mapi id 15.20.8293.000; Fri, 27 Dec 2024 04:21:15 +0000 Message-ID: <07f437ac-5278-4f50-9443-39511ecc14ba@amd.com> Date: Fri, 27 Dec 2024 15:21:09 +1100 User-Agent: Mozilla Thunderbird Beta Subject: Re: [Invitation] bi-weekly guest_memfd upstream call on 2024-11-14 Content-Language: en-US To: David Hildenbrand , Chao Gao Cc: linux-coco@lists.linux.dev, "linux-mm@kvack.org" , KVM , Fuad Tabba References: <6f2bfac2-d9e7-4e4a-9298-7accded16b4f@redhat.com> <08602ef7-6d28-471d-89c0-be3d29eb92a9@redhat.com> <82c53460-a550-4236-a65a-78f292814edb@redhat.com> From: Alexey Kardashevskiy In-Reply-To: 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A+pa3H8eHtXa/D0AyGWN6kgQS+i3gczfj0F/MrWNNDRoj4rcU28SwurVKNhI8c1kho3K87Sk41Qb+7EPBmtmpeZ/xVQkErsMaF/LPAPNXgFgombw0qUI1w3SgytYUxNH+nE8aGNp6Es2ddt2LXKFw7/OamylDpNUvDuInOW3u6vbhvxnD3BDY4SZZ6X/fMR7rFMSm0FsQnJ2o3gWElY3mCy66I0HmvNV++kIEqt3yCmQYqVIM/L2+ZnDm0TOHOzWl6ssmbRouC6PZh1WNmMpihJmnvBTwgQ4CVXvYBySrZ3ymKZEkXlV4GzrCErTm2jtjp+AHDAUa4E0+vPQsyM95oe/z7wf7nsx91OscpOWC+hjTJYaTM/2RphBPAyCXKV/e1ThRZ2y/gIfJobak6pUAdCYSh0/nVSx4QyoMf99yLJmh9ojNlo0UR2v0OFcCJxJDy/+4VKWc6o0iglL9v6/gVIffN3yTxixPMUi5P+7NPHrl0YpQWOsDaffgGUKUexncYPg4FtTmmXZvHpXB2EYps2Jlej6SOmztnvQoJqNXpcwMpYXqbxikoy+WUJv044afGwx44s5TVsJs6gupEMUqc3mgpJdpMgSEB+iBSSFdLGcDu2dM5L+f1P/2hly5Xbe8OxIq+AH8jLAPFqlEOwmkW3bXWQ== 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 24/12/24 22:27, David Hildenbrand wrote: > On 24.12.24 05:21, Alexey Kardashevskiy wrote: >> On 14/11/24 13:27, Chao Gao wrote: >>>>> With in-place conversion, QEMU can map shared memory and supply the >>>>> virtual >>>>> address to VFIO to set up DMA mappings. From this perspective, >>>>> in-place >>>>> conversion doesn't change or require any changes to the way QEMU >>>>> interacts >>>>> with VFIO. So, the key for device assignment remains updating DMA >>>>> mappings >>>>> accordingly during shared/private conversions. It seems that >>>>> whether in-place >>>>> conversion is in use (i.e., whether shared memory is managed by >>>>> guest_memfd or >>>>> not) doesn't require big changes to that proposal. Not sure if >>>>> anyone thinks >>>>> otherwise. We want to align with you on the direction for device >>>>> assignment >>>>> support for guest_memfd. >>>>> (I set aside the idea of letting KVM manage the IOMMU page table in >>>>> the above >>>>>     analysis because we probably won't get that support in the near >>>>> future) >>>> >>>> Right. So devices would also only be to access "shared" memory. >>> >>> Yes, this is the situation without TDX-Connect support. Even when >>> TDX-Connect >>> comes into play, devices will initially be attached in shared mode >>> and later >>> converted to private mode. From this perspective, TDX-Connect will be >>> built on >>> this shared device assignment proposal. >>> >>>> >>>>> >>>>> Could you please add this topic to the agenda? >>>> >>>> Will do. But I'm afraid the agenda for tomorrow is pretty packed, so >>>> we might >>>> not get to talk about it in more detail before the meeting in 2 weeks. >>> >>> Understood. is there any QEMU patch available for in-place >>> conversion? we would >>> like to play with it and also do some experiments w/ assigned >>> devices. This >>> might help us identify more potential issues for discussion. >> >> >> Have you found out if there are patches, somewhere? I am interested too. > > I remember that so far only Kernel patches are available [1], I assume > because Google focuses on other user space than QEMU. So I suspect the > QEMU integration is still TBD. > > > [1] https://lkml.kernel.org/r/20241213164811.2006197-1-tabba@google.com thanks for confirming. I saw that but could not spot the in-place conversion there. And I had to re-watch how pKVM actually works :) -- Alexey