From: Marc Zyngier <marc.zyngier@arm.com>
Date: Fri, 12 Jun 2015 11:06:37 +0000 (+0100)
Subject: arm64: KVM: Switch vgic save/restore to alternative_insn
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~137^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8a14849b4a355278f0b7baf6e2da7dc7144a23e8;p=pandora-kernel.git

arm64: KVM: Switch vgic save/restore to alternative_insn

So far, we configured the world-switch by having a small array
of pointers to the save and restore functions, depending on the
GIC used on the platform.

Loading these values each time is a bit silly (they never change),
and it makes sense to rely on the instruction patching instead.

This leads to a nice cleanup of the code.

Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---

diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index d71607c16601..e896d2c196e6 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -218,11 +218,6 @@ static inline int kvm_arch_dev_ioctl_check_extension(long ext)
 	return 0;
 }
 
-static inline void vgic_arch_setup(const struct vgic_params *vgic)
-{
-	BUG_ON(vgic->type != VGIC_V2);
-}
-
 int kvm_perf_init(void);
 int kvm_perf_teardown(void);
 
diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index 4f7310fa77f0..d13bc5eb688c 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -132,11 +132,6 @@ extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
 
 extern u64 __vgic_v3_get_ich_vtr_el2(void);
 
-extern char __save_vgic_v2_state[];
-extern char __restore_vgic_v2_state[];
-extern char __save_vgic_v3_state[];
-extern char __restore_vgic_v3_state[];
-
 #endif
 
 #endif /* __ARM_KVM_ASM_H__ */
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index f0f58c9beec0..2709db2a7eac 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -221,29 +221,6 @@ struct vgic_sr_vectors {
 	void	*restore_vgic;
 };
 
-static inline void vgic_arch_setup(const struct vgic_params *vgic)
-{
-	extern struct vgic_sr_vectors __vgic_sr_vectors;
-
-	switch(vgic->type)
-	{
-	case VGIC_V2:
-		__vgic_sr_vectors.save_vgic	= __save_vgic_v2_state;
-		__vgic_sr_vectors.restore_vgic	= __restore_vgic_v2_state;
-		break;
-
-#ifdef CONFIG_ARM_GIC_V3
-	case VGIC_V3:
-		__vgic_sr_vectors.save_vgic	= __save_vgic_v3_state;
-		__vgic_sr_vectors.restore_vgic	= __restore_vgic_v3_state;
-		break;
-#endif
-
-	default:
-		BUG();
-	}
-}
-
 static inline void kvm_arch_hardware_disable(void) {}
 static inline void kvm_arch_hardware_unsetup(void) {}
 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
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