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Tue, 18 Jul 2023 16:48:56 -0700 (PDT) Date: Tue, 18 Jul 2023 16:44:56 -0700 In-Reply-To: <20230718234512.1690985-1-seanjc@google.com> Mime-Version: 1.0 References: <20230718234512.1690985-1-seanjc@google.com> X-Mailer: git-send-email 2.41.0.255.g8b1d071c50-goog Message-ID: <20230718234512.1690985-14-seanjc@google.com> Subject: [RFC PATCH v11 13/29] KVM: Add transparent hugepage support for dedicated guest memory From: Sean Christopherson To: Paolo Bonzini , Marc Zyngier , Oliver Upton , Huacai Chen , Michael Ellerman , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Sean Christopherson , "Matthew Wilcox (Oracle)" , Andrew Morton , Paul Moore , James Morris , "Serge E. Hallyn" Cc: kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Chao Peng , Fuad Tabba , Jarkko Sakkinen , Yu Zhang , Vishal Annapurve , Ackerley Tng , Maciej Szmigiero , Vlastimil Babka , David Hildenbrand , Quentin Perret , Michael Roth , Wang , Liam Merwick , Isaku Yamahata , "Kirill A . Shutemov" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230719_005002_111502_F4D3DC41 X-CRM114-Status: GOOD ( 14.80 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Sean Christopherson Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Signed-off-by: Sean Christopherson --- include/uapi/linux/kvm.h | 2 ++ virt/kvm/guest_mem.c | 52 ++++++++++++++++++++++++++++++++++++---- 2 files changed, 50 insertions(+), 4 deletions(-) diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 9b344fc98598..17b12ee8b70e 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -2290,6 +2290,8 @@ struct kvm_memory_attributes { #define KVM_CREATE_GUEST_MEMFD _IOWR(KVMIO, 0xd4, struct kvm_create_guest_memfd) +#define KVM_GUEST_MEMFD_ALLOW_HUGEPAGE (1ULL << 0) + struct kvm_create_guest_memfd { __u64 size; __u64 flags; diff --git a/virt/kvm/guest_mem.c b/virt/kvm/guest_mem.c index 1b705fd63fa8..384671a55b41 100644 --- a/virt/kvm/guest_mem.c +++ b/virt/kvm/guest_mem.c @@ -17,15 +17,48 @@ struct kvm_gmem { struct list_head entry; }; -static struct folio *kvm_gmem_get_folio(struct file *file, pgoff_t index) +static struct folio *kvm_gmem_get_huge_folio(struct inode *inode, pgoff_t index) { +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + unsigned long huge_index = round_down(index, HPAGE_PMD_NR); + unsigned long flags = (unsigned long)inode->i_private; + struct address_space *mapping = inode->i_mapping; + gfp_t gfp = mapping_gfp_mask(mapping); struct folio *folio; - /* TODO: Support huge pages. */ - folio = filemap_grab_folio(file->f_mapping, index); + if (!(flags & KVM_GUEST_MEMFD_ALLOW_HUGEPAGE)) + return NULL; + + if (filemap_range_has_page(mapping, huge_index << PAGE_SHIFT, + (huge_index + HPAGE_PMD_NR - 1) << PAGE_SHIFT)) + return NULL; + + folio = filemap_alloc_folio(gfp, HPAGE_PMD_ORDER); if (!folio) return NULL; + if (filemap_add_folio(mapping, folio, huge_index, gfp)) { + folio_put(folio); + return NULL; + } + + return folio; +#else + return NULL; +#endif +} + +static struct folio *kvm_gmem_get_folio(struct inode *inode, pgoff_t index) +{ + struct folio *folio; + + folio = kvm_gmem_get_huge_folio(inode, index); + if (!folio) { + folio = filemap_grab_folio(inode->i_mapping, index); + if (!folio) + return NULL; + } + /* * Use the up-to-date flag to track whether or not the memory has been * zeroed before being handed off to the guest. There is no backing @@ -332,7 +365,8 @@ static const struct inode_operations kvm_gmem_iops = { .setattr = kvm_gmem_setattr, }; -static int __kvm_gmem_create(struct kvm *kvm, loff_t size, struct vfsmount *mnt) +static int __kvm_gmem_create(struct kvm *kvm, loff_t size, u64 flags, + struct vfsmount *mnt) { const char *anon_name = "[kvm-gmem]"; const struct qstr qname = QSTR_INIT(anon_name, strlen(anon_name)); @@ -355,6 +389,7 @@ static int __kvm_gmem_create(struct kvm *kvm, loff_t size, struct vfsmount *mnt) inode->i_mode |= S_IFREG; inode->i_size = size; mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER); + mapping_set_large_folios(inode->i_mapping); mapping_set_unevictable(inode->i_mapping); mapping_set_unmovable(inode->i_mapping); @@ -404,6 +439,12 @@ static bool kvm_gmem_is_valid_size(loff_t size, u64 flags) if (size < 0 || !PAGE_ALIGNED(size)) return false; +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + if ((flags & KVM_GUEST_MEMFD_ALLOW_HUGEPAGE) && + !IS_ALIGNED(size, HPAGE_PMD_SIZE)) + return false; +#endif + return true; } @@ -413,6 +454,9 @@ int kvm_gmem_create(struct kvm *kvm, struct kvm_create_guest_memfd *args) u64 flags = args->flags; u64 valid_flags = 0; + if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) + valid_flags |= KVM_GUEST_MEMFD_ALLOW_HUGEPAGE; + if (flags & ~valid_flags) return -EINVAL;