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Tue, 24 Jun 2025 03:03:32 -0700 (PDT) MIME-Version: 1.0 References: <20250611133330.1514028-1-tabba@google.com> <80e062dd-2445-45a6-ba4a-8f5fe3286909@redhat.com> In-Reply-To: <80e062dd-2445-45a6-ba4a-8f5fe3286909@redhat.com> From: Fuad Tabba Date: Tue, 24 Jun 2025 11:02:56 +0100 X-Gm-Features: Ac12FXyaJ6fQiRli6N-G9Ic58vssGb1-G3P5sN6L-3mpP1G-97NTKumDYqIFAvc Message-ID: Subject: Re: [PATCH v12 00/18] KVM: Mapping guest_memfd backed memory at the host for software protected VMs To: David Hildenbrand , Sean Christopherson Cc: kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org, kvmarm@lists.linux.dev, pbonzini@redhat.com, chenhuacai@kernel.org, mpe@ellerman.id.au, anup@brainfault.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, viro@zeniv.linux.org.uk, brauner@kernel.org, willy@infradead.org, akpm@linux-foundation.org, xiaoyao.li@intel.com, yilun.xu@intel.com, chao.p.peng@linux.intel.com, jarkko@kernel.org, amoorthy@google.com, dmatlack@google.com, isaku.yamahata@intel.com, mic@digikod.net, vbabka@suse.cz, vannapurve@google.com, ackerleytng@google.com, mail@maciej.szmigiero.name, michael.roth@amd.com, wei.w.wang@intel.com, liam.merwick@oracle.com, isaku.yamahata@gmail.com, kirill.shutemov@linux.intel.com, suzuki.poulose@arm.com, steven.price@arm.com, quic_eberman@quicinc.com, quic_mnalajal@quicinc.com, quic_tsoni@quicinc.com, quic_svaddagi@quicinc.com, quic_cvanscha@quicinc.com, quic_pderrin@quicinc.com, quic_pheragu@quicinc.com, catalin.marinas@arm.com, james.morse@arm.com, yuzenghui@huawei.com, oliver.upton@linux.dev, maz@kernel.org, will@kernel.org, qperret@google.com, keirf@google.com, roypat@amazon.co.uk, shuah@kernel.org, hch@infradead.org, jgg@nvidia.com, rientjes@google.com, jhubbard@nvidia.com, fvdl@google.com, hughd@google.com, jthoughton@google.com, peterx@redhat.com, pankaj.gupta@amd.com, ira.weiny@intel.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 2424C140012 X-Stat-Signature: sbnot54tf9b6bu35gzezmcac5oza4r1d X-HE-Tag: 1750759413-153157 X-HE-Meta: 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 kyr4GR1E SpiC3Vw1vGog3tgf6ypUfruhLy1FGsVYf4OWfngdtj7XFQibPScZ8p5KULEeYWOBSYIZf5+YX60xF9DBYb9JtTrNlxwjeTcqboy0yuEydF5pzMnk4S+ubzSptGF3pYBn5LWrsLMgFiOK+joOa7PC3ENNT8kkmT50JKnCVCqnayMEsflMhOlp+cPYGOUT9YkbQqGOLQJgzJCMCLPP8h4oT5SLn+navvRRBafqYepuO3Jp7X5jfXmFd+QrGSbsm+0VSMp7fIXa7kxywETzFpj1BA0if+FyqhqVuYCxW7TA4do9x65fFM7TicZYQTP0zTY81hL4N+3nx6PzZaOZeColT9f4crA== 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: Hi, Before I respin this, I thought I'd outline the planned changes for V13, especially since it involves a lot of repainting. I hope that by presenting this first, we could reduce the number of times I'll need to respin it. In struct kvm_arch: add bool supports_gmem instead of renaming has_private_mem The guest_memfd flag GUEST_MEMFD_FLAG_SUPPORT_SHARED should be called GUEST_MEMFD_FLAG_MMAP The memslot internal flag KVM_MEMSLOT_SUPPORTS_GMEM_SHARED should be called KVM_MEMSLOT_SUPPORTS_GMEM_MMAP kvm_arch_supports_gmem_shared_mem() should be called kvm_arch_supports_gmem_mmap() kvm_gmem_memslot_supports_shared() should be called kvm_gmem_memslot_supports_mmap() kvm_gmem_fault_shared(struct vm_fault *vmf) should be called kvm_gmem_fault_user_mapping(struct vm_fault *vmf) The capability KVM_CAP_GMEM_SHARED_MEM should be called KVM_CAP_GMEM_MMAP The Kconfig CONFIG_KVM_GMEM_SHARED_MEM should be called CONFIG_KVM_GMEM_SUPPORTS_MMAP Also, what (unless you disagree) will stay the same as V12: Rename CONFIG_KVM_PRIVATE_MEM to CONFIG_KVM_GMEM: Since private implies gmem, and we will have additional flags for MMAP support Rename CONFIG_KVM_GENERIC_PRIVATE_MEM to CONFIG_KVM_GENERIC_GMEM_POPULATE Rename kvm_slot_can_be_private() to kvm_slot_has_gmem(): since private does imply that it has gmem Thanks, /fuad On Thu, 12 Jun 2025 at 18:39, David Hildenbrand wrote: > > On 11.06.25 15:33, Fuad Tabba wrote: > > Main changes since v11 [1]: > > - Addressed various points of feedback from the last revision. > > - Rebased on Linux 6.16-rc1. > > Nit: In case you have to resend, it might be worth changing the subject > s/software protected/non-CoCo/ like you did in patch #12. > > -- > Cheers, > > David / dhildenb >