f47e5bbbc9
Re-introduce zapping only leaf SPTEs in kvm_zap_gfn_range() and kvm_tdp_mmu_unmap_gfn_range(), this time without losing a pending TLB flush when processing multiple roots (including nested TDP shadow roots). Dropping the TLB flush resulted in random crashes when running Hyper-V Server 2019 in a guest with KSM enabled in the host (or any source of mmu_notifier invalidations, KSM is just the easiest to force). This effectively revert commits873dd12217andfcb93eb6d0, and thus restores commitcf3e26427c, plus this delta on top: bool kvm_tdp_mmu_zap_leafs(struct kvm *kvm, int as_id, gfn_t start, gfn_t end, struct kvm_mmu_page *root; for_each_tdp_mmu_root_yield_safe(kvm, root, as_id) - flush = tdp_mmu_zap_leafs(kvm, root, start, end, can_yield, false); + flush = tdp_mmu_zap_leafs(kvm, root, start, end, can_yield, flush); return flush; } Cc: Ben Gardon <bgardon@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Tested-by: Vitaly Kuznetsov <vkuznets@redhat.com> Message-Id: <20220325230348.2587437-1-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.