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AJvYcCVBe7Q6Y+1ChHmo15Yfj0nWi3OLTr+OlAH9iL3H4WTHiPxFTN/Al1/47EEANE03IfP2C3oqXK5ZI4u6k5qhahc=@vger.kernel.org X-Gm-Message-State: AOJu0YzACuSKK/Hyj+dCcbhVMweX5Og2eQAU57U6k+V0q8YG2uQ+vQIp aWmEaQYWC/O8LgdBjQ57KWFMKwNWf0K/X60/rwJwTUjfwlPHUrLd7A1+RcQ4nU3/hzMecRflJe7 68rQ7HK9C0jR5pSU9gJL9Bg== X-Google-Smtp-Source: AGHT+IHeEJa/t3gbMh3LQ6wjI0/JOXt73EyPzcfCUwf0I0tvYHeE0b/ouOGMNpZEECjGvQ2LqF2A810orFlmLkMS4Q== X-Received: from ackerleytng-ctop.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:13f8]) (user=ackerleytng job=sendgmr) by 2002:a17:90a:c2c5:b0:2d8:bf47:947c with SMTP id 98e67ed59e1d1-2db8304d552mr2449a91.3.1726011921647; Tue, 10 Sep 2024 16:45:21 -0700 (PDT) Date: Tue, 10 Sep 2024 23:43:59 +0000 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.46.0.598.g6f2099f65c-goog Message-ID: Subject: [RFC PATCH 28/39] KVM: guest_memfd: Use vm_type to determine default faultability From: Ackerley Tng To: tabba@google.com, quic_eberman@quicinc.com, roypat@amazon.co.uk, jgg@nvidia.com, peterx@redhat.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 Cc: erdemaktas@google.com, vannapurve@google.com, ackerleytng@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 Memory of a KVM_X86_SW_PROTECTED_VM defaults to faultable to align with the default in kvm->mem_attr_array. For this RFC, determine default faultability when associating a range with a memslot. Another option is to determine default faultability at guest_memfd creation time. guest_memfd is created for a specific VM, hence we can set default faultability based on the VM type. In future, if different struct kvms are bound to the same guest_memfd inode, all the struct kvms must be of the same vm_type. TODO: Perhaps faultability should be based on kvm->mem_attr_array? Signed-off-by: Ackerley Tng --- virt/kvm/guest_memfd.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c index fc2483e35876..1d4dfe0660ad 100644 --- a/virt/kvm/guest_memfd.c +++ b/virt/kvm/guest_memfd.c @@ -1256,6 +1256,23 @@ static struct file *kvm_gmem_inode_create_getfile(void *priv, loff_t size, return file; } +static void kvm_gmem_set_default_faultability_by_vm_type(struct inode *inode, + u8 vm_type, + loff_t start, loff_t end) +{ + bool faultable; + + switch (vm_type) { + case KVM_X86_SW_PROTECTED_VM: + faultable = true; + break; + default: + faultable = false; + } + + WARN_ON(kvm_gmem_set_faultable(inode, start, end, faultable)); +} + static int __kvm_gmem_create(struct kvm *kvm, loff_t size, u64 flags) { struct kvm_gmem *gmem; @@ -1378,6 +1395,11 @@ int kvm_gmem_bind(struct kvm *kvm, struct kvm_memory_slot *slot, slot->gmem.pgoff = start; xa_store_range(&gmem->bindings, start, end - 1, slot, GFP_KERNEL); + + kvm_gmem_set_default_faultability_by_vm_type(file_inode(file), + kvm->arch.vm_type, + start, end); + filemap_invalidate_unlock(inode->i_mapping); /*