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2020-10-21ext4: add fast commit stats in procfsHarshad Shirwadkar
This commit adds a file in procfs that tracks fast commit related statistics. root@kvm-xfstests:/mnt# cat /proc/fs/ext4/vdc/fc_info fc stats: 7772 commits 15 ineligible 4083 numblks 2242us avg_commit_time Ineligible reasons: "Extended attributes changed": 0 "Cross rename": 0 "Journal flag changed": 0 "Insufficient memory": 0 "Swap boot": 0 "Resize": 0 "Dir renamed": 0 "Falloc range op": 0 "FC Commit Failed": 15 Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-10-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21ext4: add a mount opt to forcefully turn fast commits onHarshad Shirwadkar
This is a debug only mount option that forcefully turns fast commits on at mount time. Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-9-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21ext4: fast commit recovery pathHarshad Shirwadkar
This patch adds fast commit recovery path support for Ext4 file system. We add several helper functions that are similar in spirit to e2fsprogs journal recovery path handlers. Example of such functions include - a simple block allocator, idempotent block bitmap update function etc. Using these routines and the fast commit log in the fast commit area, the recovery path (ext4_fc_replay()) performs fast commit log recovery. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-8-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21jbd2: fast commit recovery pathHarshad Shirwadkar
This patch adds fast commit recovery support in JBD2. Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-7-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21ext4: main fast-commit commit pathHarshad Shirwadkar
This patch adds main fast commit commit path handlers. The overall patch can be divided into two inter-related parts: (A) Metadata updates tracking This part consists of helper functions to track changes that need to be committed during a commit operation. These updates are maintained by Ext4 in different in-memory queues. Following are the APIs and their short description that are implemented in this patch: - ext4_fc_track_link/unlink/creat() - Track unlink. link and creat operations - ext4_fc_track_range() - Track changed logical block offsets inodes - ext4_fc_track_inode() - Track inodes - ext4_fc_mark_ineligible() - Mark file system fast commit ineligible() - ext4_fc_start_update() / ext4_fc_stop_update() / ext4_fc_start_ineligible() / ext4_fc_stop_ineligible() These functions are useful for co-ordinating inode updates with commits. (B) Main commit Path This part consists of functions to convert updates tracked in in-memory data structures into on-disk commits. Function ext4_fc_commit() is the main entry point to commit path. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-6-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21jbd2: add fast commit machineryHarshad Shirwadkar
This functions adds necessary APIs needed in JBD2 layer for fast commits. Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-5-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21ext4 / jbd2: add fast commit initializationHarshad Shirwadkar
This patch adds fast commit area trackers in the journal_t structure. These are initialized via the jbd2_fc_init() routine that this patch adds. This patch also adds ext4/fast_commit.c and ext4/fast_commit.h files for fast commit code that will be added in subsequent patches in this series. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-4-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21ext4: add fast_commit feature and handling for extended mount optionsHarshad Shirwadkar
We are running out of mount option bits. Add handling for using s_mount_opt2. Add ext4 and jbd2 fast commit feature flag and also add ability to turn off the fast commit feature in Ext4. Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-3-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21doc: update ext4 and journalling docs to include fast commit featureHarshad Shirwadkar
This patch adds necessary documentation for fast commits. Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-2-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21rtnetlink: fix data overflow in rtnl_calcit()Di Zhu
"ip addr show" command execute error when we have a physical network card with a large number of VFs The return value of if_nlmsg_size() in rtnl_calcit() will exceed range of u16 data type when any network cards has a larger number of VFs. rtnl_vfinfo_size() will significant increase needed dump size when the value of num_vfs is larger. Eventually we get a wrong value of min_ifinfo_dump_size because of overflow which decides the memory size needed by netlink dump and netlink_dump() will return -EMSGSIZE because of not enough memory was allocated. So fix it by promoting min_dump_alloc data type to u32 to avoid whole netlink message size overflow and it's also align with the data type of struct netlink_callback{}.min_dump_alloc which is assigned by return value of rtnl_calcit() Signed-off-by: Di Zhu <zhudi21@huawei.com> Link: https://lore.kernel.org/r/20201021020053.1401-1-zhudi21@huawei.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-10-21net: ethernet: mtk-star-emac: select REGMAP_MMIOBartosz Golaszewski
The driver depends on mmio regmap API but doesn't select the appropriate Kconfig option. This fixes it. Fixes: 8c7bd5a454ff ("net: ethernet: mtk-star-emac: new driver") Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com> Link: https://lore.kernel.org/r/20201020073515.22769-1-brgl@bgdev.pl Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-10-21net: hdlc_raw_eth: Clear the IFF_TX_SKB_SHARING flag after calling ether_setupXie He
This driver calls ether_setup to set up the network device. The ether_setup function would add the IFF_TX_SKB_SHARING flag to the device. This flag indicates that it is safe to transmit shared skbs to the device. However, this is not true. This driver may pad the frame (in eth_tx) before transmission, so the skb may be modified. Fixes: 550fd08c2ceb ("net: Audit drivers to identify those needing IFF_TX_SKB_SHARING cleared") Cc: Neil Horman <nhorman@tuxdriver.com> Cc: Krzysztof Halasa <khc@pm.waw.pl> Signed-off-by: Xie He <xie.he.0141@gmail.com> Link: https://lore.kernel.org/r/20201020063420.187497-1-xie.he.0141@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-10-21net: hdlc: In hdlc_rcv, check to make sure dev is an HDLC deviceXie He
The hdlc_rcv function is used as hdlc_packet_type.func to process any skb received in the kernel with skb->protocol == htons(ETH_P_HDLC). The purpose of this function is to provide second-stage processing for skbs not assigned a "real" L3 skb->protocol value in the first stage. This function assumes the device from which the skb is received is an HDLC device (a device created by this module). It assumes that netdev_priv(dev) returns a pointer to "struct hdlc_device". However, it is possible that some driver in the kernel (not necessarily in our control) submits a received skb with skb->protocol == htons(ETH_P_HDLC), from a non-HDLC device. In this case, the skb would still be received by hdlc_rcv. This will cause problems. hdlc_rcv should be able to recognize and drop invalid skbs. It should first make sure "dev" is actually an HDLC device, before starting its processing. This patch adds this check to hdlc_rcv. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: Krzysztof Halasa <khc@pm.waw.pl> Signed-off-by: Xie He <xie.he.0141@gmail.com> Link: https://lore.kernel.org/r/20201020013152.89259-1-xie.he.0141@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-10-22bpf, libbpf: Guard bpf inline asm from bpf_tail_call_staticDaniel Borkmann
Yaniv reported a compilation error after pulling latest libbpf: [...] ../libbpf/src/root/usr/include/bpf/bpf_helpers.h:99:10: error: unknown register name 'r0' in asm : "r0", "r1", "r2", "r3", "r4", "r5"); [...] The issue got triggered given Yaniv was compiling tracing programs with native target (e.g. x86) instead of BPF target, hence no BTF generated vmlinux.h nor CO-RE used, and later llc with -march=bpf was invoked to compile from LLVM IR to BPF object file. Given that clang was expecting x86 inline asm and not BPF one the error complained that these regs don't exist on the former. Guard bpf_tail_call_static() with defined(__bpf__) where BPF inline asm is valid to use. BPF tracing programs on more modern kernels use BPF target anyway and thus the bpf_tail_call_static() function will be available for them. BPF inline asm is supported since clang 7 (clang <= 6 otherwise throws same above error), and __bpf_unreachable() since clang 8, therefore include the latter condition in order to prevent compilation errors for older clang versions. Given even an old Ubuntu 18.04 LTS has official LLVM packages all the way up to llvm-10, I did not bother to special case the __bpf_unreachable() inside bpf_tail_call_static() further. Also, undo the sockex3_kern's use of bpf_tail_call_static() sample given they still have the old hacky way to even compile networking progs with native instead of BPF target so bpf_tail_call_static() won't be defined there anymore. Fixes: 0e9f6841f664 ("bpf, libbpf: Add bpf_tail_call_static helper for bpf programs") Reported-by: Yaniv Agman <yanivagman@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Tested-by: Yaniv Agman <yanivagman@gmail.com> Link: https://lore.kernel.org/bpf/CAMy7=ZUk08w5Gc2Z-EKi4JFtuUCaZYmE4yzhJjrExXpYKR4L8w@mail.gmail.com Link: https://lore.kernel.org/bpf/20201021203257.26223-1-daniel@iogearbox.net
2020-10-22bpf, selftests: Extend test_tc_redirect to use modified bpf_redirect_neigh()Toke Høiland-Jørgensen
This updates the test_tc_neigh prog in selftests to use the new syntax of bpf_redirect_neigh(). To exercise the helper both with and without the optional parameter, add an additional test_tc_neigh_fib test program, which does a bpf_fib_lookup() followed by a call to bpf_redirect_neigh() instead of looking up the ifindex in a map. Update the test_tc_redirect.sh script to run both versions of the test, and while we're add it, fix it to work on systems that have a consolidated dual-stack 'ping' binary instead of separate ping/ping6 versions. Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/160322915724.32199.17530068594636950447.stgit@toke.dk
2020-10-22exfat: remove useless check in exfat_move_file()Tetsuhiro Kohada
In exfat_move_file(), the identity of source and target directory has been checked by the caller. Also, it gets stream.start_clu from file dir-entry, which is an invalid determination. Signed-off-by: Tetsuhiro Kohada <kohada.t2@gmail.com> Acked-by: Sungjong Seo <sj1557.seo@samsung.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
2020-10-22exfat: remove 'rwoffset' in exfat_inode_infoTetsuhiro Kohada
Remove 'rwoffset' in exfat_inode_info and replace it with the parameter of exfat_readdir(). Since rwoffset is referenced only by exfat_readdir(), it is not necessary a exfat_inode_info's member. Also, change cpos to point to the next of entry-set, and return the index of dir-entry via dir_entry->entry. Signed-off-by: Tetsuhiro Kohada <kohada.t2@gmail.com> Acked-by: Sungjong Seo <sj1557.seo@samsung.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
2020-10-22exfat: replace memcpy with structure assignmentTetsuhiro Kohada
Use structure assignment instead of memcpy. Signed-off-by: Tetsuhiro Kohada <kohada.t2@gmail.com> Acked-by: Sungjong Seo <sj1557.seo@samsung.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
2020-10-22exfat: remove useless directory scan in exfat_add_entry()Tetsuhiro Kohada
There is nothing in directory just created, so there is no need to scan. Signed-off-by: Tetsuhiro Kohada <kohada.t2@gmail.com> Acked-by: Sungjong Seo <sj1557.seo@samsung.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
2020-10-22exfat: eliminate dead code in exfat_find()Tetsuhiro Kohada
The exfat_find_dir_entry() called by exfat_find() doesn't return -EEXIST. Therefore, the root-dir information setting is never executed. Signed-off-by: Tetsuhiro Kohada <kohada.t2@gmail.com> Acked-by: Sungjong Seo <sj1557.seo@samsung.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
2020-10-22exfat: use i_blocksize() to get blocksizeXianting Tian
We alreday has the interface i_blocksize() to get blocksize, so use it. Signed-off-by: Xianting Tian <tian.xianting@h3c.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
2020-10-22exfat: fix misspellings using codespell toolNamjae Jeon
Sedat reported typos using codespell tool. $ codespell fs/exfat/*.c | grep -v iput fs/exfat/namei.c:293: upto ==> up to fs/exfat/nls.c:14: tabel ==> table $ codespell fs/exfat/*.h fs/exfat/exfat_fs.h:133: usally ==> usually Fix typos found by codespell. Reported-by: Sedat Dilek <sedat.dilek@gmail.com> Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
2020-10-22bpf: Fix bpf_redirect_neigh helper api to support supplying nexthopToke Høiland-Jørgensen
Based on the discussion in [0], update the bpf_redirect_neigh() helper to accept an optional parameter specifying the nexthop information. This makes it possible to combine bpf_fib_lookup() and bpf_redirect_neigh() without incurring a duplicate FIB lookup - since the FIB lookup helper will return the nexthop information even if no neighbour is present, this can simply be passed on to bpf_redirect_neigh() if bpf_fib_lookup() returns BPF_FIB_LKUP_RET_NO_NEIGH. Thus fix & extend it before helper API is frozen. [0] https://lore.kernel.org/bpf/393e17fc-d187-3a8d-2f0d-a627c7c63fca@iogearbox.net/ Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/bpf/160322915615.32199.1187570224032024535.stgit@toke.dk
2020-10-21smb3: do not try to cache root directory if dir leases not supportedSteve French
To servers which do not support directory leases (e.g. Samba) it is wasteful to try to open_shroot (ie attempt to cache the root directory handle). Skip attempt to open_shroot when server does not indicate support for directory leases. Cuts the number of requests on mount from 17 to 15, and cuts the number of requests on stat of the root directory from 4 to 3. Signed-off-by: Steve French <stfrench@microsoft.com> CC: Stable <stable@vger.kernel.org> # v5.1+
2020-10-21smb3: fix stat when special device file and mounted with modefromsidSteve French
When mounting with modefromsid mount option, it was possible to get the error on stat of a fifo or char or block device: "cannot stat <filename>: Operation not supported" Special devices can be stored as reparse points by some servers (e.g. Windows NFS server and when using the SMB3.1.1 POSIX Extensions) but when the modefromsid mount option is used the client attempts to get the ACL for the file which requires opening with OPEN_REPARSE_POINT create option. Signed-off-by: Steve French <stfrench@microsoft.com> CC: Stable <stable@vger.kernel.org> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com> Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
2020-10-21cifs: Print the address and port we are connecting to in generic_ip_connect()Samuel Cabrero
Can be helpful in debugging mount and reconnect issues Signed-off-by: Samuel Cabrero <scabrero@suse.de> Reviewed-by: Shyam Prasad N <sprasad@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
2020-10-21SMB3: Resolve data corruption of TCP server info fieldsRohith Surabattula
TCP server info field server->total_read is modified in parallel by demultiplex thread and decrypt offload worker thread. server->total_read is used in calculation to discard the remaining data of PDU which is not read into memory. Because of parallel modification, server->total_read can get corrupted and can result in discarding the valid data of next PDU. Signed-off-by: Rohith Surabattula <rohiths@microsoft.com> Reviewed-by: Aurelien Aptel <aaptel@suse.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> CC: Stable <stable@vger.kernel.org> #5.4+ Signed-off-by: Steve French <stfrench@microsoft.com>
2020-10-21kvm: x86/mmu: Remove disallowed_hugepage_adjust shadow_walk_iterator argBen Gardon
In order to avoid creating executable hugepages in the TDP MMU PF handler, remove the dependency between disallowed_hugepage_adjust and the shadow_walk_iterator. This will open the function up to being used by the TDP MMU PF handler in a future patch. Tested by running kvm-unit-tests and KVM selftests on an Intel Haswell machine. This series introduced no new failures. This series can be viewed in Gerrit at: https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2538 Signed-off-by: Ben Gardon <bgardon@google.com> Message-Id: <20201014182700.2888246-10-bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21kvm: x86/mmu: Support zapping SPTEs in the TDP MMUBen Gardon
Add functions to zap SPTEs to the TDP MMU. These are needed to tear down TDP MMU roots properly and implement other MMU functions which require tearing down mappings. Future patches will add functions to populate the page tables, but as for this patch there will not be any work for these functions to do. Tested by running kvm-unit-tests and KVM selftests on an Intel Haswell machine. This series introduced no new failures. This series can be viewed in Gerrit at: https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2538 Signed-off-by: Ben Gardon <bgardon@google.com> Message-Id: <20201014182700.2888246-8-bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21KVM: Cache as_id in kvm_memory_slotPeter Xu
Cache the address space ID just like the slot ID. It will be used in order to fill in the dirty ring entries. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com> Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20201014182700.2888246-7-bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21kvm: x86/mmu: Add functions to handle changed TDP SPTEsBen Gardon
The existing bookkeeping done by KVM when a PTE is changed is spread around several functions. This makes it difficult to remember all the stats, bitmaps, and other subsystems that need to be updated whenever a PTE is modified. When a non-leaf PTE is marked non-present or becomes a leaf PTE, page table memory must also be freed. To simplify the MMU and facilitate the use of atomic operations on SPTEs in future patches, create functions to handle some of the bookkeeping required as a result of a change. Tested by running kvm-unit-tests and KVM selftests on an Intel Haswell machine. This series introduced no new failures. This series can be viewed in Gerrit at: https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2538 Signed-off-by: Ben Gardon <bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21kvm: x86/mmu: Allocate and free TDP MMU rootsBen Gardon
The TDP MMU must be able to allocate paging structure root pages and track the usage of those pages. Implement a similar, but separate system for root page allocation to that of the x86 shadow paging implementation. When future patches add synchronization model changes to allow for parallel page faults, these pages will need to be handled differently from the x86 shadow paging based MMU's root pages. Tested by running kvm-unit-tests and KVM selftests on an Intel Haswell machine. This series introduced no new failures. This series can be viewed in Gerrit at: https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2538 Signed-off-by: Ben Gardon <bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21kvm: x86/mmu: Init / Uninit the TDP MMUBen Gardon
The TDP MMU offers an alternative mode of operation to the x86 shadow paging based MMU, optimized for running an L1 guest with TDP. The TDP MMU will require new fields that need to be initialized and torn down. Add hooks into the existing KVM MMU initialization process to do that initialization / cleanup. Currently the initialization and cleanup fucntions do not do very much, however more operations will be added in future patches. Tested by running kvm-unit-tests and KVM selftests on an Intel Haswell machine. This series introduced no new failures. This series can be viewed in Gerrit at: https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2538 Signed-off-by: Ben Gardon <bgardon@google.com> Message-Id: <20201014182700.2888246-4-bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21kvm: x86/mmu: Introduce tdp_iterBen Gardon
The TDP iterator implements a pre-order traversal of a TDP paging structure. This iterator will be used in future patches to create an efficient implementation of the KVM MMU for the TDP case. Tested by running kvm-unit-tests and KVM selftests on an Intel Haswell machine. This series introduced no new failures. This series can be viewed in Gerrit at: https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2538 Signed-off-by: Ben Gardon <bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21KVM: mmu: extract spte.h and spte.cPaolo Bonzini
The SPTE format will be common to both the shadow and the TDP MMU. Extract code that implements the format to a separate module, as a first step towards adding the TDP MMU and putting mmu.c on a diet. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21KVM: mmu: Separate updating a PTE from kvm_set_pte_rmappPaolo Bonzini
The TDP MMU's own function for the changed-PTE notifier will need to be update a PTE in the exact same way as the shadow MMU. Rather than re-implementing this logic, factor the SPTE creation out of kvm_set_pte_rmapp. Extracted out of a patch by Ben Gardon. <bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21kvm: x86/mmu: Separate making SPTEs from set_spteBen Gardon
Separate the functions for generating leaf page table entries from the function that inserts them into the paging structure. This refactoring will facilitate changes to the MMU sychronization model to use atomic compare / exchanges (which are not guaranteed to succeed) instead of a monolithic MMU lock. No functional change expected. Tested by running kvm-unit-tests and KVM selftests on an Intel Haswell machine. This commit introduced no new failures. This series can be viewed in Gerrit at: https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2538 Signed-off-by: Ben Gardon <bgardon@google.com> Reviewed-by: Peter Shier <pshier@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21kvm: mmu: Separate making non-leaf sptes from link_shadow_pageBen Gardon
The TDP MMU page fault handler will need to be able to create non-leaf SPTEs to build up the paging structures. Rather than re-implementing the function, factor the SPTE creation out of link_shadow_page. Tested by running kvm-unit-tests and KVM selftests on an Intel Haswell machine. This series introduced no new failures. This series can be viewed in Gerrit at: https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2538 Signed-off-by: Ben Gardon <bgardon@google.com> Message-Id: <20200925212302.3979661-9-bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21Merge branch 'kvm-fixes' into 'next'Paolo Bonzini
Pick up bugfixes from 5.9, otherwise various tests fail.
2020-10-21KVM: PPC: Book3S HV: Make struct kernel_param_ops definition constJoe Perches
This should be const, so make it so. Signed-off-by: Joe Perches <joe@perches.com> Message-Id: <d130e88dd4c82a12d979da747cc0365c72c3ba15.1601770305.git.joe@perches.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21KVM: x86: Let the guest own CR4.FSGSBASELai Jiangshan
Add FSGSBASE to the set of possible guest-owned CR4 bits, i.e. let the guest own it on VMX. KVM never queries the guest's CR4.FSGSBASE value, thus there is no reason to force VM-Exit on FSGSBASE being toggled. Note, because FSGSBASE is conditionally available, this is dependent on recent changes to intercept reserved CR4 bits and to update the CR4 guest/host mask in response to guest CPUID changes. Cc: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com> [sean: added justification in changelog] Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Message-Id: <20200930041659.28181-6-sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21KVM: VMX: Intercept guest reserved CR4 bits to inject #GP faultSean Christopherson
Intercept CR4 bits that are guest reserved so that KVM correctly injects a #GP fault if the guest attempts to set a reserved bit. If a feature is supported by the CPU but is not exposed to the guest, and its associated CR4 bit is not intercepted by KVM by default, then KVM will fail to inject a #GP if the guest sets the CR4 bit without triggering an exit, e.g. by toggling only the bit in question. Note, KVM doesn't give the guest direct access to any CR4 bits that are also dependent on guest CPUID. Yet. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Message-Id: <20200930041659.28181-5-sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21KVM: x86: Move call to update_exception_bitmap() into VMX codeSean Christopherson
Now that vcpu_after_set_cpuid() and update_exception_bitmap() are called back-to-back, subsume the exception bitmap update into the common CPUID update. Drop the SVM invocation entirely as SVM's exception bitmap doesn't vary with respect to guest CPUID. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Message-Id: <20200930041659.28181-4-sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21KVM: x86: Invoke vendor's vcpu_after_set_cpuid() after all common updatesSean Christopherson
Move the call to kvm_x86_ops.vcpu_after_set_cpuid() to the very end of kvm_vcpu_after_set_cpuid() to allow the vendor implementation to react to changes made by the common code. In the near future, this will be used by VMX to update its CR4 guest/host masks to account for reserved bits. In the long term, SGX support will update the allowed XCR0 mask for enclaves based on the vCPU's allowed XCR0. vcpu_after_set_cpuid() (nee kvm_update_cpuid()) was originally added by commit 2acf923e38fb ("KVM: VMX: Enable XSAVE/XRSTOR for guest"), and was called separately after kvm_x86_ops.vcpu_after_set_cpuid() (nee kvm_x86_ops->cpuid_update()). There is no indication that the placement of the common code updates after the vendor updates was anything more than a "new function at the end" decision. Inspection of the current code reveals no dependency on kvm_x86_ops' vcpu_after_set_cpuid() in kvm_vcpu_after_set_cpuid() or any of its helpers. The bulk of the common code depends only on the guest's CPUID configuration, kvm_mmu_reset_context() does not consume dynamic vendor state, and there are no collisions between kvm_pmu_refresh() and VMX's update of PT state. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Message-Id: <20200930041659.28181-3-sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21KVM: x86: Intercept LA57 to inject #GP fault when it's reservedLai Jiangshan
Unconditionally intercept changes to CR4.LA57 so that KVM correctly injects a #GP fault if the guest attempts to set CR4.LA57 when it's supported in hardware but not exposed to the guest. Long term, KVM needs to properly handle CR4 bits that can be under guest control but also may be reserved from the guest's perspective. But, KVM currently sets the CR4 guest/host mask only during vCPU creation, and reworking flows to change that will take a bit of elbow grease. Even if/when generic support for intercepting reserved bits exists, it's probably not worth letting the guest set CR4.LA57 directly. LA57 can't be toggled while long mode is enabled, thus it's all but guaranteed to be set once (maybe twice, e.g. by BIOS and kernel) during boot and never touched again. On the flip side, letting the guest own CR4.LA57 may incur extra VMREADs. In other words, this temporary "hack" is probably also the right long term fix. Fixes: fd8cb433734e ("KVM: MMU: Expose the LA57 feature to VM.") Cc: stable@vger.kernel.org Cc: Lai Jiangshan <jiangshanlai@gmail.com> Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com> [sean: rewrote changelog] Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Message-Id: <20200930041659.28181-2-sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21KVM: SVM: Initialize prev_ga_tag before useSuravee Suthikulpanit
The function amd_ir_set_vcpu_affinity makes use of the parameter struct amd_iommu_pi_data.prev_ga_tag to determine if it should delete struct amd_iommu_pi_data from a list when not running in AVIC mode. However, prev_ga_tag is initialized only when AVIC is enabled. The non-zero uninitialized value can cause unintended code path, which ends up making use of the struct vcpu_svm.ir_list and ir_list_lock without being initialized (since they are intended only for the AVIC case). This triggers NULL pointer dereference bug in the function vm_ir_list_del with the following call trace: svm_update_pi_irte+0x3c2/0x550 [kvm_amd] ? proc_create_single_data+0x41/0x50 kvm_arch_irq_bypass_add_producer+0x40/0x60 [kvm] __connect+0x5f/0xb0 [irqbypass] irq_bypass_register_producer+0xf8/0x120 [irqbypass] vfio_msi_set_vector_signal+0x1de/0x2d0 [vfio_pci] vfio_msi_set_block+0x77/0xe0 [vfio_pci] vfio_pci_set_msi_trigger+0x25c/0x2f0 [vfio_pci] vfio_pci_set_irqs_ioctl+0x88/0xb0 [vfio_pci] vfio_pci_ioctl+0x2ea/0xed0 [vfio_pci] ? alloc_file_pseudo+0xa5/0x100 vfio_device_fops_unl_ioctl+0x26/0x30 [vfio] ? vfio_device_fops_unl_ioctl+0x26/0x30 [vfio] __x64_sys_ioctl+0x96/0xd0 do_syscall_64+0x37/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Therefore, initialize prev_ga_tag to zero before use. This should be safe because ga_tag value 0 is invalid (see function avic_vm_init). Fixes: dfa20099e26e ("KVM: SVM: Refactor AVIC vcpu initialization into avic_init_vcpu()") Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Message-Id: <20201003232707.4662-1-suravee.suthikulpanit@amd.com> Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21KVM: nSVM: implement on demand allocation of the nested stateMaxim Levitsky
This way we don't waste memory on VMs which don't use nesting virtualization even when the host enabled it for them. Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> Message-Id: <20201001112954.6258-5-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21KVM: x86: allow kvm_x86_ops.set_efer to return an error valueMaxim Levitsky
This will be used to signal an error to the userspace, in case the vendor code failed during handling of this msr. (e.g -ENOMEM) Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> Message-Id: <20201001112954.6258-4-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21KVM: x86: report negative values from wrmsr emulation to userspaceMaxim Levitsky
This will allow the KVM to report such errors (e.g -ENOMEM) to the userspace. Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> Message-Id: <20201001112954.6258-3-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-10-21KVM: x86: xen_hvm_config: cleanup return valuesMaxim Levitsky
Return 1 on errors that are caused by wrong guest behavior (which will inject #GP to the guest) And return a negative error value on issues that are the kernel's fault (e.g -ENOMEM) Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> Message-Id: <20201001112954.6258-2-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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