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Convert kvm_unmap_gfn_range(), which is the helper that zaps rmap SPTEs in response to an mmu_notifier invalidation, to use __kvm_rmap_zap_gfn_range() and feed in range->may_block. In other words, honor NEED_RESCHED by way of cond_resched() when zapping rmaps. This fixes a long-standing issue where KVM could process an absurd number of rmap entries without ever yielding, e.g. if an mmu_notifier fired on a PUD (or larger) range. Opportunistically rename __kvm_zap_rmap() to kvm_zap_rmap(), and drop the old kvm_zap_rmap(). Ideally, the shuffling would be done in a different patch, but that just makes the compiler unhappy, e.g. arch/x86/kvm/mmu/mmu.c:1462:13: error: ‘kvm_zap_rmap’ defined but not used Reported-by: Peter Xu <peterx@redhat.com> Link: https://lore.kernel.org/r/20240809194335.1726916-14-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.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 reStructuredText 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.