diff options
| author | Will Deacon <will@kernel.org> | 2022-11-10 20:02:55 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2022-11-11 18:19:35 +0100 |
| commit | 73f38ef2ae531b180685173e0923225551434fcb (patch) | |
| tree | c67b03ec07350daca0afc1f04806115d3f5da43f /arch/arm64/kernel/image-vars.h | |
| parent | KVM: arm64: Unmap 'kvm_arm_hyp_percpu_base' from the host (diff) | |
| download | linux-73f38ef2ae531b180685173e0923225551434fcb.tar.xz linux-73f38ef2ae531b180685173e0923225551434fcb.zip | |
KVM: arm64: Maintain a copy of 'kvm_arm_vmid_bits' at EL2
Sharing 'kvm_arm_vmid_bits' between EL1 and EL2 allows the host to
modify the variable arbitrarily, potentially leading to all sorts of
shenanians as this is used to configure the VTTBR register for the
guest stage-2.
In preparation for unmapping host sections entirely from EL2, maintain
a copy of 'kvm_arm_vmid_bits' in the pKVM hypervisor and initialise it
from the host value while it is still trusted.
Tested-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221110190259.26861-23-will@kernel.org
Diffstat (limited to 'arch/arm64/kernel/image-vars.h')
| -rw-r--r-- | arch/arm64/kernel/image-vars.h | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index ae8f37f4aa8c..31ad75da4d58 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -71,9 +71,6 @@ KVM_NVHE_ALIAS(nvhe_hyp_panic_handler); /* Vectors installed by hyp-init on reset HVC. */ KVM_NVHE_ALIAS(__hyp_stub_vectors); -/* VMID bits set by the KVM VMID allocator */ -KVM_NVHE_ALIAS(kvm_arm_vmid_bits); - /* Static keys which are set if a vGIC trap should be handled in hyp. */ KVM_NVHE_ALIAS(vgic_v2_cpuif_trap); KVM_NVHE_ALIAS(vgic_v3_cpuif_trap); |