ARM: KVM: Switch to C-based stage2 init

As we now have hooks to setup VTCR from C code, let's drop the
original VTCR setup and reimplement it as part of the HYP code.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

6 files changed, 40 insertions, 8 deletions

diff --git a/arch/arm/include/asm/kvm_asm.h b/arch/arm/include/asm/kvm_asm.h
index 4841225d10ea..3283a2f63254 100644
--- a/arch/arm/include/asm/kvm_asm.h
+++ b/arch/arm/include/asm/kvm_asm.h
@@ -98,6 +98,8 @@ extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa);
 extern void __kvm_tlb_flush_vmid(struct kvm *kvm);
 
 extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
+
+extern void __init_stage2_translation(void);
 #endif
 
 #endif /* __ARM_KVM_ASM_H__ */
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index c62d71751f7a..0fe41aaf2171 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -224,6 +224,7 @@ static inline void __cpu_init_hyp_mode(phys_addr_t boot_pgd_ptr,
 
 static inline void __cpu_init_stage2(void)
 {
+        kvm_call_hyp(__init_stage2_translation);
 }
 
 static inline int kvm_arch_dev_ioctl_check_extension(long ext)
diff --git a/arch/arm/kvm/hyp/Makefile b/arch/arm/kvm/hyp/Makefile
index a7d3a7e0b702..7152369504a6 100644
--- a/arch/arm/kvm/hyp/Makefile
+++ b/arch/arm/kvm/hyp/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_KVM_ARM_HOST) += banked-sr.o
 obj-$(CONFIG_KVM_ARM_HOST) += entry.o
 obj-$(CONFIG_KVM_ARM_HOST) += hyp-entry.o
 obj-$(CONFIG_KVM_ARM_HOST) += switch.o
+obj-$(CONFIG_KVM_ARM_HOST) += s2-setup.o
diff --git a/arch/arm/kvm/hyp/hyp.h b/arch/arm/kvm/hyp/hyp.h
index 8b9c2eb5a9dc..ff6de6a3af2d 100644
--- a/arch/arm/kvm/hyp/hyp.h
+++ b/arch/arm/kvm/hyp/hyp.h
@@ -71,6 +71,8 @@
 #define HCPTR           __ACCESS_CP15(c1, 4, c1, 2)
 #define HSTR            __ACCESS_CP15(c1, 4, c1, 3)
 #define TTBCR           __ACCESS_CP15(c2, 0, c0, 2)
+#define HTCR            __ACCESS_CP15(c2, 4, c0, 2)
+#define VTCR            __ACCESS_CP15(c2, 4, c1, 2)
 #define DACR            __ACCESS_CP15(c3, 0, c0, 0)
 #define DFSR            __ACCESS_CP15(c5, 0, c0, 0)
 #define IFSR            __ACCESS_CP15(c5, 0, c0, 1)
diff --git a/arch/arm/kvm/hyp/s2-setup.c b/arch/arm/kvm/hyp/s2-setup.c
new file mode 100644
index 000000000000..f5f49c53be28
--- /dev/null
+++ b/arch/arm/kvm/hyp/s2-setup.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2016 - 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/types.h>
+#include <asm/kvm_arm.h>
+#include <asm/kvm_asm.h>
+
+#include "hyp.h"
+
+void __hyp_text __init_stage2_translation(void)
+{
+        u64 val;
+
+        val = read_sysreg(VTCR) & ~VTCR_MASK;
+
+        val |= read_sysreg(HTCR) & VTCR_HTCR_SH;
+        val |= KVM_VTCR_SL0 | KVM_VTCR_T0SZ | KVM_VTCR_S;
+
+        write_sysreg(val, VTCR);
+}
diff --git a/arch/arm/kvm/init.S b/arch/arm/kvm/init.S
index 3988e72d16ff..1f9ae17476f9 100644
--- a/arch/arm/kvm/init.S
+++ b/arch/arm/kvm/init.S
@@ -84,14 +84,6 @@ __do_hyp_init:
         orr     r0, r0, r1
         mcr     p15, 4, r0, c2, c0, 2   @ HTCR
 
-        mrc     p15, 4, r1, c2, c1, 2   @ VTCR
-        ldr     r2, =VTCR_MASK
-        bic     r1, r1, r2
-        bic     r0, r0, #(~VTCR_HTCR_SH)        @ clear non-reusable HTCR bits
-        orr     r1, r0, r1
-        orr     r1, r1, #(KVM_VTCR_SL0 | KVM_VTCR_T0SZ | KVM_VTCR_S)
-        mcr     p15, 4, r1, c2, c1, 2   @ VTCR
-
         @ Use the same memory attributes for hyp. accesses as the kernel
         @ (copy MAIRx ro HMAIRx).
         mrc     p15, 0, r0, c10, c2, 0