KVM: arm64: Handle guest_memfd-backed guest page faults

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Add arm64 architecture support for handling guest page faults on memory
slots backed by guest_memfd.

This change introduces a new function, gmem_abort(), which encapsulates
the fault handling logic specific to guest_memfd-backed memory. The
kvm_handle_guest_abort() entry point is updated to dispatch to
gmem_abort() when a fault occurs on a guest_memfd-backed memory slot (as
determined by kvm_slot_has_gmem()).

Until guest_memfd gains support for huge pages, the fault granule for
these memory regions is restricted to PAGE_SIZE.

Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: James Houghton <jthoughton@google.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20250729225455.670324-19-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Fuad Tabba 2025-07-29 15:54:49 -07:00 • committed by Paolo Bonzini

parent 638ea79669

commit a7b57e0995

1 changed files with 83 additions and 3 deletions

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arch/arm64/kvm/mmu.c

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