| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Wed, 21 Sep 2022 15:49:04 +0800
From: kernel test robot <lkp@...el.com>
To: Isaku Yamahata <isaku.yamahata@...el.com>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [intel-tdx:kvm-upstream-workaround 190/314]
arch/x86/kvm/mmu/tdp_mmu.c:787:35: sparse: sparse: incorrect type in
argument 1 (different address spaces)
tree: https://github.com/intel/tdx.git kvm-upstream-workaround
head: 552dd80c48f67ca01bcdd10667e0c11efd375177
commit: 7f8c8738e7b76f16e05a5e16a194e26237c1e5bc [190/314] KVM: x86/tdp_mmu: optimize remote tlb flush
config: x86_64-randconfig-s022-20220919
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.4-39-gce1a6720-dirty
# https://github.com/intel/tdx/commit/7f8c8738e7b76f16e05a5e16a194e26237c1e5bc
git remote add intel-tdx https://github.com/intel/tdx.git
git fetch --no-tags intel-tdx kvm-upstream-workaround
git checkout 7f8c8738e7b76f16e05a5e16a194e26237c1e5bc
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kvm/ block/ drivers/acpi/ drivers/ata/ drivers/auxdisplay/ drivers/block/ drivers/comedi/ drivers/hwmon/ drivers/infiniband/core/ drivers/infiniband/hw/qib/ drivers/net/ drivers/nvme/host/ drivers/platform/x86/ drivers/rapidio/ drivers/scsi/ drivers/staging/media/av7110/ drivers/thermal/intel/int340x_thermal/ drivers/tty/ drivers/vfio/ drivers/vhost/ drivers/watchdog/ drivers/xen/ fs/crypto/ fs/ext2/ fs/ext4/ fs/fat/ fs/quota/ fs/reiserfs/ ipc/ kernel/ net/appletalk/ net/ax25/ net/bluetooth/ net/can/ net/core/ net/dccp/ net/decnet/ net/ipv4/bpfilter/ net/llc/ net/mptcp/ net/netfilter/ net/netrom/ net/qrtr/ net/rfkill/ net/rose/ net/rxrpc/ net/sctp/ net/tls/ net/x25/ security/apparmor/ sound/core/ sound/pci/asihpi/ virt/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
sparse warnings: (new ones prefixed by >>)
arch/x86/kvm/mmu/tdp_mmu.c:662:17: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu * @@
arch/x86/kvm/mmu/tdp_mmu.c:662:17: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:662:17: sparse: got unsigned long long [noderef] [usertype] __rcu *
>> arch/x86/kvm/mmu/tdp_mmu.c:787:35: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *const [usertype] sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:787:35: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:787:35: sparse: got unsigned long long [noderef] [usertype] __rcu *const [usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:863:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:863:9: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:863:9: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:877:28: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:877:28: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:877:28: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:1729:9: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:1729:9: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:1729:9: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:1408:17: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:1408:17: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:1408:17: sparse: got unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:406:9: sparse: sparse: context imbalance in 'tdp_mmu_unlink_sp' - different lock contexts for basic block
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep @@ got unsigned long long [usertype] *sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: got unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c: note: in included file (through include/linux/rculist.h, include/linux/pid.h, include/linux/sched.h, ...):
include/linux/rcupdate.h:737:9: sparse: sparse: context imbalance in '__tdp_mmu_zap_root' - unexpected unlock
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep @@ got unsigned long long [usertype] *sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: got unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep @@ got unsigned long long [usertype] *sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: got unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep @@ got unsigned long long [usertype] *sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: got unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep @@ got unsigned long long [usertype] *sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: got unsigned long long [usertype] *sptep
include/linux/rcupdate.h:737:9: sparse: sparse: context imbalance in 'tdp_mmu_alloc_sp_for_split' - unexpected unlock
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep @@ got unsigned long long [usertype] *sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: got unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [usertype] *sptep @@ got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: expected unsigned long long [usertype] *sptep
arch/x86/kvm/mmu/tdp_mmu.c:749:49: sparse: got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep @@ got unsigned long long [usertype] *sptep @@
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: expected unsigned long long [noderef] [usertype] __rcu *[addressable] [usertype] sptep
arch/x86/kvm/mmu/tdp_mmu.c:777:42: sparse: got unsigned long long [usertype] *sptep
vim +787 arch/x86/kvm/mmu/tdp_mmu.c
527
528 /**
529 * __handle_changed_spte - handle bookkeeping associated with an SPTE change
530 * @kvm: kvm instance
531 * @as_id: the address space of the paging structure the SPTE was a part of
532 * @gfn: the base GFN that was mapped by the SPTE
533 * @old_spte: The value of the SPTE before the change
534 * @new_spte: The value of the SPTE after the change
535 * @role: the role of the PT the SPTE is part of in the paging structure
536 * @shared: This operation may not be running under the exclusive use of
537 * the MMU lock and the operation must synchronize with other
538 * threads that might be modifying SPTEs.
539 *
540 * Handle bookkeeping that might result from the modification of a SPTE.
541 * This function must be called for all TDP SPTE modifications.
542 */
543 static void __handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn,
544 u64 old_spte, u64 new_spte,
545 union kvm_mmu_page_role role, bool shared)
546 {
547 bool is_private = kvm_mmu_page_role_is_private(role);
548 int level = role.level;
549 bool was_present = is_shadow_present_pte(old_spte);
550 bool is_present = is_shadow_present_pte(new_spte);
551 bool was_last = is_last_spte(old_spte, level);
552 bool is_last = is_last_spte(new_spte, level);
553 bool was_leaf = was_present && was_last;
554 bool is_leaf = is_present && is_last;
555 kvm_pfn_t old_pfn = spte_to_pfn(old_spte);
556 kvm_pfn_t new_pfn = spte_to_pfn(new_spte);
557 bool pfn_changed = old_pfn != new_pfn;
558 bool was_private_zapped = is_private_zapped_spte(old_spte);
559 bool is_private_zapped = is_private_zapped_spte(new_spte);
560 struct kvm_spte_change change = {
561 .gfn = gfn,
562 .level = level,
563 .old = {
564 .pfn = old_pfn,
565 .is_present = was_present,
566 .is_last = was_last,
567 .is_private_zapped = was_private_zapped,
568 },
569 .new = {
570 .pfn = new_pfn,
571 .is_present = is_present,
572 .is_last = is_last,
573 .is_private_zapped = is_private_zapped,
574 },
575 };
576
577 WARN_ON(level > PT64_ROOT_MAX_LEVEL);
578 WARN_ON(level < PG_LEVEL_4K);
579 WARN_ON(gfn & (KVM_PAGES_PER_HPAGE(level) - 1));
580 KVM_BUG_ON(kvm_is_private_gpa(kvm, gfn_to_gpa(gfn)) != is_private, kvm);
581 KVM_BUG_ON(was_private_zapped && !is_private, kvm);
582
583 /*
584 * If this warning were to trigger it would indicate that there was a
585 * missing MMU notifier or a race with some notifier handler.
586 * A present, leaf SPTE should never be directly replaced with another
587 * present leaf SPTE pointing to a different PFN. A notifier handler
588 * should be zapping the SPTE before the main MM's page table is
589 * changed, or the SPTE should be zeroed, and the TLBs flushed by the
590 * thread before replacement.
591 */
592 if (was_leaf && is_leaf && pfn_changed) {
593 pr_err("Invalid SPTE change: cannot replace a present leaf\n"
594 "SPTE with another present leaf SPTE mapping a\n"
595 "different PFN!\n"
596 "as_id: %d gfn: %llx old_spte: %llx new_spte: %llx level: %d",
597 as_id, gfn, old_spte, new_spte, level);
598
599 /*
600 * Crash the host to prevent error propagation and guest data
601 * corruption.
602 */
603 BUG();
604 }
605
606 if (old_spte == new_spte)
607 return;
608
609 trace_kvm_tdp_mmu_spte_changed(as_id, gfn, level, old_spte, new_spte);
610
611 if (is_leaf)
612 check_spte_writable_invariants(new_spte);
613
614 if (was_private_zapped) {
615 KVM_BUG_ON(is_private_zapped, kvm);
616 static_call(kvm_x86_handle_private_zapped_spte)(kvm, &change);
617 /* Temporarily blocked private SPTE can only be leaf. */
618 KVM_BUG_ON(!is_last_spte(old_spte, level), kvm);
619 return;
620 }
621
622 /*
623 * The only times a SPTE should be changed from a non-present to
624 * non-present state is when an MMIO entry is installed/modified/
625 * removed. In that case, there is nothing to do here.
626 */
627 if (!was_present && !is_present) {
628 /*
629 * If this change does not involve a MMIO SPTE or removed SPTE,
630 * it is unexpected. Log the change, though it should not
631 * impact the guest since both the former and current SPTEs
632 * are nonpresent.
633 */
634 if (WARN_ON(!is_mmio_spte(kvm, old_spte) &&
635 !is_mmio_spte(kvm, new_spte) &&
636 !is_removed_spte(new_spte)))
637 pr_err("Unexpected SPTE change! Nonpresent SPTEs\n"
638 "should not be replaced with another,\n"
639 "different nonpresent SPTE, unless one or both\n"
640 "are MMIO SPTEs, or the new SPTE is\n"
641 "a temporary removed SPTE.\n"
642 "as_id: %d gfn: %llx old_spte: %llx new_spte: %llx level: %d",
643 as_id, gfn, old_spte, new_spte, level);
644 return;
645 }
646
647 if (is_leaf != was_leaf)
648 kvm_update_page_stats(kvm, level, is_leaf ? 1 : -1);
649
650 if (was_leaf && is_dirty_spte(old_spte) &&
651 (!is_present || !is_dirty_spte(new_spte) || pfn_changed))
652 kvm_set_pfn_dirty(old_pfn);
653
654 /*
655 * Recursively handle child PTs if the change removed a subtree from
656 * the paging structure. Note the WARN on the PFN changing without the
657 * SPTE being converted to a hugepage (leaf) or being zapped. Shadow
658 * pages are kernel allocations and should never be migrated.
659 */
660 if (was_present && !was_leaf &&
661 (is_leaf || !is_present || WARN_ON_ONCE(pfn_changed))) {
> 662 KVM_BUG_ON(is_private != is_private_sptep(spte_to_child_pt(old_spte, level)),
663 kvm);
664 handle_removed_pt(kvm, spte_to_child_pt(old_spte, level), shared);
665 }
666
667 /*
668 * Special handling for the private mapping. We are either
669 * setting up new mapping at middle level page table, or leaf,
670 * or tearing down existing mapping.
671 *
672 * This is after handling lower page table by above
673 * handle_remove_tdp_mmu_page(). S-EPT requires to remove S-EPT tables
674 * after removing childrens.
675 */
676 if (is_private &&
677 /* Ignore change of software only bits. e.g. host_writable */
678 (was_leaf != is_leaf || was_present != is_present || pfn_changed ||
679 was_private_zapped != is_private_zapped)) {
680 void *private_spt = NULL;
681
682 if (is_present && !is_leaf) {
683 struct kvm_mmu_page *sp = to_shadow_page(pfn_to_hpa(new_pfn));
684
685 private_spt = kvm_mmu_private_spt(sp);
686 KVM_BUG_ON(!private_spt, kvm);
687 KVM_BUG_ON(sp->role.level + 1 != level, kvm);
688 KVM_BUG_ON(sp->gfn != gfn, kvm);
689 }
690 change.private_spt = private_spt;
691
692 KVM_BUG_ON(was_private_zapped && is_private_zapped, kvm);
693 /*
694 * When write lock is held, leaf pte should be zapping or
695 * prohibiting. Not directly was_present=1 -> zero EPT entry.
696 */
697 KVM_BUG_ON(!shared && is_leaf && !is_private_zapped, kvm);
698 static_call(kvm_x86_handle_changed_private_spte)(kvm, &change);
699 }
700 }
701
702 static void handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn,
703 u64 old_spte, u64 new_spte,
704 union kvm_mmu_page_role role, bool shared)
705 {
706 __handle_changed_spte(kvm, as_id, gfn, old_spte, new_spte, role, shared);
707 handle_changed_spte_acc_track(old_spte, new_spte, role.level);
708 handle_changed_spte_dirty_log(kvm, as_id, gfn, old_spte,
709 new_spte, role.level);
710 }
711
712 /*
713 * tdp_mmu_set_spte_atomic - Set a TDP MMU SPTE atomically
714 * and handle the associated bookkeeping. Do not mark the page dirty
715 * in KVM's dirty bitmaps.
716 *
717 * If setting the SPTE fails because it has changed, iter->old_spte will be
718 * refreshed to the current value of the spte.
719 *
720 * @kvm: kvm instance
721 * @iter: a tdp_iter instance currently on the SPTE that should be set
722 * @new_spte: The value the SPTE should be set to
723 * Return:
724 * * 0 - If the SPTE was set.
725 * * -EBUSY - If the SPTE cannot be set. In this case this function will have
726 * no side-effects other than setting iter->old_spte to the last
727 * known value of the spte.
728 */
729 static inline int tdp_mmu_set_spte_atomic(struct kvm *kvm,
730 struct tdp_iter *iter,
731 u64 new_spte)
732 {
733 /*
734 * For conventional page table, the update flow is
735 * - update STPE with atomic operation
736 * - handle changed SPTE. __handle_changed_spte()
737 * NOTE: __handle_changed_spte() (and functions) must be safe against
738 * concurrent update. It is an exception to zap SPTE. See
739 * tdp_mmu_zap_spte_atomic().
740 *
741 * For private page table, callbacks are needed to propagate SPTE
742 * change into the protected page table. In order to atomically update
743 * both the SPTE and the protected page tables with callbacks, utilize
744 * freezing SPTE.
745 * - Freeze the SPTE. Set entry to REMOVED_SPTE.
746 * - Trigger callbacks for protected page tables. __handle_changed_spte()
747 * - Unfreeze the SPTE. Set the entry to new_spte.
748 */
749 bool freeze_spte = is_private_sptep(iter->sptep) && !is_removed_spte(new_spte);
750 u64 tmp_spte = freeze_spte ? REMOVED_SPTE : new_spte;
751 u64 *sptep = rcu_dereference(iter->sptep);
752
753 KVM_BUG_ON(iter->yielded, kvm);
754
755 /*
756 * The caller is responsible for ensuring the old SPTE is not a REMOVED
757 * SPTE. KVM should never attempt to zap or manipulate a REMOVED SPTE,
758 * and pre-checking before inserting a new SPTE is advantageous as it
759 * avoids unnecessary work.
760 */
761 WARN_ON_ONCE(iter->yielded || is_removed_spte(iter->old_spte));
762
763 lockdep_assert_held_read(&kvm->mmu_lock);
764
765 /*
766 * Note, fast_pf_fix_direct_spte() can also modify TDP MMU SPTEs and
767 * does not hold the mmu_lock.
768 */
769 if (!try_cmpxchg64(sptep, &iter->old_spte, tmp_spte))
770 return -EBUSY;
771
772 __handle_changed_spte(kvm, iter->as_id, iter->gfn, iter->old_spte,
773 new_spte, sptep_to_sp(sptep)->role, true);
774 handle_changed_spte_acc_track(iter->old_spte, new_spte, iter->level);
775
776 if (freeze_spte)
777 __kvm_tdp_mmu_write_spte(sptep, new_spte);
778
779 return 0;
780 }
781
782 static u64 private_zapped_spte(struct kvm *kvm, const struct tdp_iter *iter)
783 {
784 if (!kvm_gfn_shared_mask(kvm))
785 return SHADOW_NONPRESENT_VALUE;
786
> 787 if (!is_private_sptep(iter->sptep))
788 return SHADOW_NONPRESENT_VALUE;
789
790 return SHADOW_NONPRESENT_VALUE | SPTE_PRIVATE_ZAPPED |
791 (spte_to_pfn(iter->old_spte) << PAGE_SHIFT) |
792 (is_large_pte(iter->old_spte) ? PT_PAGE_SIZE_MASK : 0);
793 }
794
--
0-DAY CI Kernel Test Service
https://01.org/lkp
View attachment "config" of type "text/plain" (166605 bytes)
Powered by blists - more mailing lists