KVM: arm64: Add helpers to pin memory shared with the hypervisor at EL2

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Add helpers allowing the hypervisor to check whether a range of pages
are currently shared by the host, and 'pin' them if so by blocking host
unshare operations until the memory has been unpinned.

This will allow the hypervisor to take references on host-provided
data-structures (e.g. 'struct kvm') with the guarantee that these pages
will remain in a stable state until the hypervisor decides to release
them, for example during guest teardown.

Tested-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Quentin Perret <qperret@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221110190259.26861-9-will@kernel.org

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Quentin Perret 2022-11-10 19:02:41 +00:00 • committed by Marc Zyngier

parent 43c1ff8b75

commit 9926cfce8d

3 changed files with 57 additions and 1 deletions

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3

arch/arm64/kvm/hyp/include/nvhe/mem_protect.h

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arch/arm64/kvm/hyp/include/nvhe/memory.h

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arch/arm64/kvm/hyp/nvhe/mem_protect.c

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