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Tue, 25 Feb 2025 12:37:13 -0800 (PST) X-Google-Smtp-Source: AGHT+IFotTZ/dQhUmhniqjIu8SiEBEne0EGahBIhmibL4OkgpDX+sNTQXhjiXbEsxwXRiWLeeDe4Vw== X-Received: by 2002:a05:6830:6c11:b0:727:25c6:1b60 with SMTP id 46e09a7af769-7274c1840famr14524623a34.5.1740515833295; Tue, 25 Feb 2025 12:37:13 -0800 (PST) Received: from x1.local ([2604:7a40:2041:2b00::1000]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7289deed409sm431155a34.40.2025.02.25.12.37.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 25 Feb 2025 12:37:12 -0800 (PST) Date: Tue, 25 Feb 2025 15:37:07 -0500 From: Peter Xu To: Ackerley Tng Cc: tabba@google.com, quic_eberman@quicinc.com, roypat@amazon.co.uk, jgg@nvidia.com, david@redhat.com, rientjes@google.com, fvdl@google.com, jthoughton@google.com, seanjc@google.com, pbonzini@redhat.com, zhiquan1.li@intel.com, fan.du@intel.com, jun.miao@intel.com, isaku.yamahata@intel.com, muchun.song@linux.dev, mike.kravetz@oracle.com, erdemaktas@google.com, vannapurve@google.com, qperret@google.com, jhubbard@nvidia.com, willy@infradead.org, shuah@kernel.org, brauner@kernel.org, bfoster@redhat.com, kent.overstreet@linux.dev, pvorel@suse.cz, rppt@kernel.org, richard.weiyang@gmail.com, anup@brainfault.org, haibo1.xu@intel.com, ajones@ventanamicro.com, vkuznets@redhat.com, maciej.wieczor-retman@intel.com, pgonda@google.com, oliver.upton@linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-fsdevel@kvack.org Subject: Re: [RFC PATCH 26/39] KVM: guest_memfd: Track faultability within a struct kvm_gmem_private Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: On Tue, Sep 10, 2024 at 11:43:57PM +0000, Ackerley Tng wrote: > @@ -1079,12 +1152,20 @@ static struct inode *kvm_gmem_inode_make_secure_inode(const char *name, > if (err) > goto out; > > + err = -ENOMEM; > + private = kzalloc(sizeof(*private), GFP_KERNEL); > + if (!private) > + goto out; > + > if (flags & KVM_GUEST_MEMFD_HUGETLB) { > - err = kvm_gmem_hugetlb_setup(inode, size, flags); > + err = kvm_gmem_hugetlb_setup(inode, private, size, flags); > if (err) > - goto out; > + goto free_private; > } > > + xa_init(&private->faultability); > + inode->i_mapping->i_private_data = private; > + > inode->i_private = (void *)(unsigned long)flags; Looks like inode->i_private isn't used before this series; the flags was always zero before anyway. Maybe it could keep kvm_gmem_inode_private instead? Then make the flags be part of the struct. It avoids two separate places (inode->i_mapping->i_private_data, inode->i_private) to store gmem private info. > inode->i_op = &kvm_gmem_iops; > inode->i_mapping->a_ops = &kvm_gmem_aops; > @@ -1097,6 +1178,8 @@ static struct inode *kvm_gmem_inode_make_secure_inode(const char *name, > > return inode; > > +free_private: > + kfree(private); > out: > iput(inode); > > -- > 2.46.0.598.g6f2099f65c-goog > -- Peter Xu