[PATCH v4 05/28] arm64: KVM: Implement HVC_RESET_VECTORS stub hypercall in the init code
From: Marc Zyngier <hidden>
Date: 2017-03-21 19:20:35
Also in:
kvm, kvmarm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
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@arm.com> Signed-off-by: Marc Zyngier <redacted> --- 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