In order to restore HYP mode to its original condition, KVM currently implements __kvm_hyp_reset(). As we're moving towards a hyp-stub defined API, it becomes necessary to implement HVC_RESET_VECTORS. This patch adds the HVC_RESET_VECTORS hypercall to the KVM init code, which so far lacked any form of hypercall support. Reviewed-by: James Morse <james.morse@xxxxxxx> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx> --- arch/arm64/kvm/hyp-init.S | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S index 6b29d3d9e1f2..6cf98ccd10f2 100644 --- a/arch/arm64/kvm/hyp-init.S +++ b/arch/arm64/kvm/hyp-init.S @@ -22,6 +22,7 @@ #include <asm/kvm_mmu.h> #include <asm/pgtable-hwdef.h> #include <asm/sysreg.h> +#include <asm/virt.h> .text .pushsection .hyp.idmap.text, "ax" @@ -58,6 +59,9 @@ __invalid: * x2: HYP vectors */ __do_hyp_init: + /* Check for a stub HVC call */ + cmp x0, #HVC_STUB_HCALL_NR + b.lo __kvm_handle_stub_hvc msr ttbr0_el2, x0 @@ -119,6 +123,9 @@ __do_hyp_init: eret ENDPROC(__kvm_hyp_init) +ENTRY(__kvm_handle_stub_hvc) + cmp x0, #HVC_RESET_VECTORS + b.ne 1f /* * Reset kvm back to the hyp stub. */ @@ -133,9 +140,14 @@ ENTRY(__kvm_hyp_reset) /* Install stub vectors */ adr_l x0, __hyp_stub_vectors msr vbar_el2, x0 + b exit +1: mov x0, #-1 + +exit: eret ENDPROC(__kvm_hyp_reset) +ENDPROC(__kvm_handle_stub_hvc) .ltorg -- 2.11.0
