KVM: arm64: nv: Delay freeing of shadow S2 structures until VM destruction

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We free the shadow S2 structures from kvm_arch_flush_shadow_all(), which
is a Bad Idea(tm). Freeing the page tables is fair game (this is what
this callback is for), but freeing the container that could still be
referenced by another part of the system is not great.

Instead, grow separate destructors that gets called when we tear the VM
down for good. From there, we can nuke both the individual MMUs as well
as the global array that points to them, safe in the knowledge that the
vcpus themselves have been destroyed already.

Fixes: 4f128f8e1a ("KVM: arm64: nv: Support multiple nested Stage-2 mmu structures")
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Reviewed-by: Wei-Lin Chang <weilin.chang@arm.com>
Link: https://patch.msgid.link/20260911162203.1919330-3-maz@kernel.org
Signed-off-by: Oliver Upton <oupton@kernel.org>

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Marc Zyngier 2026-09-11 17:22:03 +01:00 • committed by Oliver Upton

parent 33346f8960

commit e5843f4eff

3 changed files with 13 additions and 7 deletions

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arch/arm64/include/asm/kvm_nested.h

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arch/arm64/kvm/arm.c

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arch/arm64/kvm/nested.c

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