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authorMarc Zyngier <marc.zyngier@arm.com>2018-02-15 12:47:14 +0100
committerMarc Zyngier <marc.zyngier@arm.com>2018-03-19 14:06:46 +0100
commitdee39247dc75465a24990cb1772c6aaced5fd910 (patch)
treefb6f241d24eaee60ad33127a318521dccae02661 /arch/arm64/kvm/va_layout.c
parentarm64: Make BP hardening slot counter available (diff)
downloadlinux-dee39247dc75465a24990cb1772c6aaced5fd910.tar.xz
linux-dee39247dc75465a24990cb1772c6aaced5fd910.zip
arm64: KVM: Allow mapping of vectors outside of the RAM region
We're now ready to map our vectors in weird and wonderful locations. On enabling ARM64_HARDEN_EL2_VECTORS, a vector slot gets allocated if this hasn't been already done via ARM64_HARDEN_BRANCH_PREDICTOR and gets mapped outside of the normal RAM region, next to the idmap. That way, being able to obtain VBAR_EL2 doesn't reveal the mapping of the rest of the hypervisor code. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/kvm/va_layout.c')
-rw-r--r--arch/arm64/kvm/va_layout.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index 2deb6e9874c9..c712a7376bc1 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -151,6 +151,9 @@ void __init kvm_update_va_mask(struct alt_instr *alt,
}
}
+void *__kvm_bp_vect_base;
+int __kvm_harden_el2_vector_slot;
+
void kvm_patch_vector_branch(struct alt_instr *alt,
__le32 *origptr, __le32 *updptr, int nr_inst)
{