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AJvYcCXsXYAQjR0hPQi3Kn63UsMF/7JIiSNJSej3eqrraDjmoRRP/Yv6o4zqH6BILVRxESwuix5u1FV3flDGA6KH@vger.kernel.org X-Gm-Message-State: AOJu0YwGhuHr8hgD3GMG7D+qwO6+H5Yu4HUzCiCsmYsvCSrVhSiKS0Dy wg9GLK1wmoy1rmbMZqtpUZ1k0gSj2rY5HItgz2xVk4okXWmNpUx0LgpEx04V5EBFT8My7djVkPf kkxWodVISH5MPHfTddmE8jg== X-Google-Smtp-Source: AGHT+IGK1505Z+7Ltj5/aIaYU2/uK6H1PmXwZ8+A0lZ5yW9OmGTcOSnh69lygj29kJbn7gmEfzs1V0Zln0gB2gFDxA== X-Received: from plrj13.prod.google.com ([2002:a17:903:28d:b0:22f:a4aa:b819]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:198e:b0:22e:5e82:6701 with SMTP id d9443c01a7336-231b5e9cdc6mr4377715ad.18.1747266241271; Wed, 14 May 2025 16:44:01 -0700 (PDT) Date: Wed, 14 May 2025 16:42:20 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.49.0.1045.g170613ef41-goog Message-ID: <147952f80781ebf35446f07c2a36810bce4de032.1747264138.git.ackerleytng@google.com> Subject: [RFC PATCH v2 41/51] KVM: Add CAP to indicate support for HugeTLB as custom allocator From: Ackerley Tng To: kvm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-fsdevel@vger.kernel.org Cc: ackerleytng@google.com, aik@amd.com, ajones@ventanamicro.com, akpm@linux-foundation.org, amoorthy@google.com, anthony.yznaga@oracle.com, anup@brainfault.org, aou@eecs.berkeley.edu, bfoster@redhat.com, binbin.wu@linux.intel.com, brauner@kernel.org, catalin.marinas@arm.com, chao.p.peng@intel.com, chenhuacai@kernel.org, dave.hansen@intel.com, david@redhat.com, dmatlack@google.com, dwmw@amazon.co.uk, erdemaktas@google.com, fan.du@intel.com, fvdl@google.com, graf@amazon.com, haibo1.xu@intel.com, hch@infradead.org, hughd@google.com, ira.weiny@intel.com, isaku.yamahata@intel.com, jack@suse.cz, james.morse@arm.com, jarkko@kernel.org, jgg@ziepe.ca, jgowans@amazon.com, jhubbard@nvidia.com, jroedel@suse.de, jthoughton@google.com, jun.miao@intel.com, kai.huang@intel.com, keirf@google.com, kent.overstreet@linux.dev, kirill.shutemov@intel.com, liam.merwick@oracle.com, maciej.wieczor-retman@intel.com, mail@maciej.szmigiero.name, maz@kernel.org, mic@digikod.net, michael.roth@amd.com, mpe@ellerman.id.au, muchun.song@linux.dev, nikunj@amd.com, nsaenz@amazon.es, oliver.upton@linux.dev, palmer@dabbelt.com, pankaj.gupta@amd.com, paul.walmsley@sifive.com, pbonzini@redhat.com, pdurrant@amazon.co.uk, peterx@redhat.com, pgonda@google.com, pvorel@suse.cz, qperret@google.com, quic_cvanscha@quicinc.com, quic_eberman@quicinc.com, quic_mnalajal@quicinc.com, quic_pderrin@quicinc.com, quic_pheragu@quicinc.com, quic_svaddagi@quicinc.com, quic_tsoni@quicinc.com, richard.weiyang@gmail.com, rick.p.edgecombe@intel.com, rientjes@google.com, roypat@amazon.co.uk, rppt@kernel.org, seanjc@google.com, shuah@kernel.org, steven.price@arm.com, steven.sistare@oracle.com, suzuki.poulose@arm.com, tabba@google.com, thomas.lendacky@amd.com, usama.arif@bytedance.com, vannapurve@google.com, vbabka@suse.cz, viro@zeniv.linux.org.uk, vkuznets@redhat.com, wei.w.wang@intel.com, will@kernel.org, willy@infradead.org, xiaoyao.li@intel.com, yan.y.zhao@intel.com, yilun.xu@intel.com, yuzenghui@huawei.com, zhiquan1.li@intel.com Content-Type: text/plain; charset="UTF-8" If this CAP returns true, then guestmem_hugetlb can be used as a custom allocator for guest_memfd. Change-Id: I4edef395b5bd5814b70c81788d87aa94823c35d5 Signed-off-by: Ackerley Tng --- include/uapi/linux/kvm.h | 1 + virt/kvm/kvm_main.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index af486b2e4862..5012343dc2c5 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -932,6 +932,7 @@ struct kvm_enable_cap { #define KVM_CAP_ARM_WRITABLE_IMP_ID_REGS 239 #define KVM_CAP_GMEM_SHARED_MEM 240 #define KVM_CAP_GMEM_CONVERSION 241 +#define KVM_CAP_GMEM_HUGETLB 242 struct kvm_irq_routing_irqchip { __u32 irqchip; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 92054b1bbd3f..230bcb853712 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -4845,6 +4845,10 @@ static int kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) case KVM_CAP_GMEM_SHARED_MEM: case KVM_CAP_GMEM_CONVERSION: return true; +#endif +#ifdef CONFIG_KVM_GMEM_HUGETLB + case KVM_CAP_GMEM_HUGETLB: + return true; #endif default: break; -- 2.49.0.1045.g170613ef41-goog