arm64: KVM: hypervisor initialization code

Provide EL2 with page tables and stack, and set the vectors
to point to the full blown world-switch code.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 4a2622f..2500eb6 100644 (file)
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -183,4 +183,17 @@ int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 int kvm_perf_init(void);
 int kvm_perf_teardown(void);
 
+static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
+                                      phys_addr_t pgd_ptr,
+                                      unsigned long hyp_stack_ptr,
+                                      unsigned long vector_ptr)
+{
+       /*
+        * Call initialization code, and switch to the full blown
+        * HYP code.
+        */
+       kvm_call_hyp((void *)boot_pgd_ptr, pgd_ptr,
+                    hyp_stack_ptr, vector_ptr);
+}
+
 #endif /* __ARM64_KVM_HOST_H__ */

diff --git a/arch/arm64/kvm/hyp-init.S b/arch/arm64/kvm/hyp-init.S
new file mode 100644 (file)
index 0000000..ba84e67
--- /dev/null
+++ b/arch/arm64/kvm/hyp-init.S
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/assembler.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_mmu.h>
+
+       .text
+       .pushsection    .hyp.idmap.text, "ax"
+
+       .align  11
+
+ENTRY(__kvm_hyp_init)
+       ventry  __invalid               // Synchronous EL2t
+       ventry  __invalid               // IRQ EL2t
+       ventry  __invalid               // FIQ EL2t
+       ventry  __invalid               // Error EL2t
+
+       ventry  __invalid               // Synchronous EL2h
+       ventry  __invalid               // IRQ EL2h
+       ventry  __invalid               // FIQ EL2h
+       ventry  __invalid               // Error EL2h
+
+       ventry  __do_hyp_init           // Synchronous 64-bit EL1
+       ventry  __invalid               // IRQ 64-bit EL1
+       ventry  __invalid               // FIQ 64-bit EL1
+       ventry  __invalid               // Error 64-bit EL1
+
+       ventry  __invalid               // Synchronous 32-bit EL1
+       ventry  __invalid               // IRQ 32-bit EL1
+       ventry  __invalid               // FIQ 32-bit EL1
+       ventry  __invalid               // Error 32-bit EL1
+
+__invalid:
+       b       .
+
+       /*
+        * x0: HYP boot pgd
+        * x1: HYP pgd
+        * x2: HYP stack
+        * x3: HYP vectors
+        */
+__do_hyp_init:
+
+       msr     ttbr0_el2, x0
+
+       mrs     x4, tcr_el1
+       ldr     x5, =TCR_EL2_MASK
+       and     x4, x4, x5
+       ldr     x5, =TCR_EL2_FLAGS
+       orr     x4, x4, x5
+       msr     tcr_el2, x4
+
+       ldr     x4, =VTCR_EL2_FLAGS
+       msr     vtcr_el2, x4
+
+       mrs     x4, mair_el1
+       msr     mair_el2, x4
+       isb
+
+       mov     x4, #SCTLR_EL2_FLAGS
+       msr     sctlr_el2, x4
+       isb
+
+       /* MMU is now enabled. Get ready for the trampoline dance */
+       ldr     x4, =TRAMPOLINE_VA
+       adr     x5, target
+       bfi     x4, x5, #0, #PAGE_SHIFT
+       br      x4
+
+target: /* We're now in the trampoline code, switch page tables */
+       msr     ttbr0_el2, x1
+       isb
+
+       /* Invalidate the old TLBs */
+       tlbi    alle2
+       dsb     sy
+
+       /* Set the stack and new vectors */
+       kern_hyp_va     x2
+       mov     sp, x2
+       kern_hyp_va     x3
+       msr     vbar_el2, x3
+
+       /* Hello, World! */
+       eret
+ENDPROC(__kvm_hyp_init)
+
+       .ltorg
+
+       .popsection