KVM: arm64: Validate the SVE vector length in pkvm_vcpu_init_sve()

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pkvm_vcpu_init_sve() clamps only the upper bound of the host-provided
sve_max_vl, so an invalid vector length reaches sve_state_size_from_vl()
and the WARN_ON() there, which is fatal at EL2. The existing
!sve_state_size test rejects such a length, but only after the macro has
run.

Check sve_vl_valid() before deriving the state size. A valid length
cannot yield a zero size, so the !sve_state_size test goes with it.

Fixes: 5db1bef933 ("KVM: arm64: Track SVE state in the hypervisor vcpu structure")
Reported-by: Stefan Teodorescu <fane@google.com>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Link: https://patch.msgid.link/20260825085948.1674721-2-fuad.tabba@linux.dev
Signed-off-by: Oliver Upton <oupton@kernel.org>

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Fuad Tabba 2026-08-25 09:59:45 +01:00 • committed by Oliver Upton

parent 4c74e233cd

commit 2a2eb10795

1 changed files with 3 additions and 2 deletions

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

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