arm64: KVM: Move kvm/hyp/hyp.h to include/asm/kvm_hyp.h

In order to be able to move code outside of kvm/hyp, we need to make
the global hyp.h file accessible from a standard location.

include/asm/kvm_hyp.h seems good enough.

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

1 files changed, 180 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
new file mode 100644
index 000000000000..44eaff70da6a
--- /dev/null
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -0,0 +1,180 @@
+/*
+ * Copyright (C) 2015 - 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/>.
+ */
+
+#ifndef __ARM64_KVM_HYP_H__
+#define __ARM64_KVM_HYP_H__
+
+#include <linux/compiler.h>
+#include <linux/kvm_host.h>
+#include <asm/kvm_mmu.h>
+#include <asm/sysreg.h>
+
+#define __hyp_text __section(.hyp.text) notrace
+
+static inline unsigned long __kern_hyp_va(unsigned long v)
+{
+	asm volatile(ALTERNATIVE("and %0, %0, %1",
+				 "nop",
+				 ARM64_HAS_VIRT_HOST_EXTN)
+		     : "+r" (v) : "i" (HYP_PAGE_OFFSET_MASK));
+	return v;
+}
+
+#define kern_hyp_va(v) (typeof(v))(__kern_hyp_va((unsigned long)(v)))
+
+static inline unsigned long __hyp_kern_va(unsigned long v)
+{
+	u64 offset = PAGE_OFFSET - HYP_PAGE_OFFSET;
+	asm volatile(ALTERNATIVE("add %0, %0, %1",
+				 "nop",
+				 ARM64_HAS_VIRT_HOST_EXTN)
+		     : "+r" (v) : "r" (offset));
+	return v;
+}
+
+#define hyp_kern_va(v) (typeof(v))(__hyp_kern_va((unsigned long)(v)))
+
+#define read_sysreg_elx(r,nvh,vh)					\
+	({								\
+		u64 reg;						\
+		asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##nvh),\
+					 "mrs_s %0, " __stringify(r##vh),\
+					 ARM64_HAS_VIRT_HOST_EXTN)	\
+			     : "=r" (reg));				\
+		reg;							\
+	})
+
+#define write_sysreg_elx(v,r,nvh,vh)					\
+	do {								\
+		u64 __val = (u64)(v);					\
+		asm volatile(ALTERNATIVE("msr " __stringify(r##nvh) ", %x0",\
+					 "msr_s " __stringify(r##vh) ", %x0",\
+					 ARM64_HAS_VIRT_HOST_EXTN)	\
+					 : : "rZ" (__val));		\
+	} while (0)
+
+/*
+ * Unified accessors for registers that have a different encoding
+ * between VHE and non-VHE. They must be specified without their "ELx"
+ * encoding.
+ */
+#define read_sysreg_el2(r)						\
+	({								\
+		u64 reg;						\
+		asm volatile(ALTERNATIVE("mrs %0, " __stringify(r##_EL2),\
+					 "mrs %0, " __stringify(r##_EL1),\
+					 ARM64_HAS_VIRT_HOST_EXTN)	\
+			     : "=r" (reg));				\
+		reg;							\
+	})
+
+#define write_sysreg_el2(v,r)						\
+	do {								\
+		u64 __val = (u64)(v);					\
+		asm volatile(ALTERNATIVE("msr " __stringify(r##_EL2) ", %x0",\
+					 "msr " __stringify(r##_EL1) ", %x0",\
+					 ARM64_HAS_VIRT_HOST_EXTN)	\
+					 : : "rZ" (__val));		\
+	} while (0)
+
+#define read_sysreg_el0(r)	read_sysreg_elx(r, _EL0, _EL02)
+#define write_sysreg_el0(v,r)	write_sysreg_elx(v, r, _EL0, _EL02)
+#define read_sysreg_el1(r)	read_sysreg_elx(r, _EL1, _EL12)
+#define write_sysreg_el1(v,r)	write_sysreg_elx(v, r, _EL1, _EL12)
+
+/* The VHE specific system registers and their encoding */
+#define sctlr_EL12              sys_reg(3, 5, 1, 0, 0)
+#define cpacr_EL12              sys_reg(3, 5, 1, 0, 2)
+#define ttbr0_EL12              sys_reg(3, 5, 2, 0, 0)
+#define ttbr1_EL12              sys_reg(3, 5, 2, 0, 1)
+#define tcr_EL12                sys_reg(3, 5, 2, 0, 2)
+#define afsr0_EL12              sys_reg(3, 5, 5, 1, 0)
+#define afsr1_EL12              sys_reg(3, 5, 5, 1, 1)
+#define esr_EL12                sys_reg(3, 5, 5, 2, 0)
+#define far_EL12                sys_reg(3, 5, 6, 0, 0)
+#define mair_EL12               sys_reg(3, 5, 10, 2, 0)
+#define amair_EL12              sys_reg(3, 5, 10, 3, 0)
+#define vbar_EL12               sys_reg(3, 5, 12, 0, 0)
+#define contextidr_EL12         sys_reg(3, 5, 13, 0, 1)
+#define cntkctl_EL12            sys_reg(3, 5, 14, 1, 0)
+#define cntp_tval_EL02          sys_reg(3, 5, 14, 2, 0)
+#define cntp_ctl_EL02           sys_reg(3, 5, 14, 2, 1)
+#define cntp_cval_EL02          sys_reg(3, 5, 14, 2, 2)
+#define cntv_tval_EL02          sys_reg(3, 5, 14, 3, 0)
+#define cntv_ctl_EL02           sys_reg(3, 5, 14, 3, 1)
+#define cntv_cval_EL02          sys_reg(3, 5, 14, 3, 2)
+#define spsr_EL12               sys_reg(3, 5, 4, 0, 0)
+#define elr_EL12                sys_reg(3, 5, 4, 0, 1)
+
+/**
+ * hyp_alternate_select - Generates patchable code sequences that are
+ * used to switch between two implementations of a function, depending
+ * on the availability of a feature.
+ *
+ * @fname: a symbol name that will be defined as a function returning a
+ * function pointer whose type will match @orig and @alt
+ * @orig: A pointer to the default function, as returned by @fname when
+ * @cond doesn't hold
+ * @alt: A pointer to the alternate function, as returned by @fname
+ * when @cond holds
+ * @cond: a CPU feature (as described in asm/cpufeature.h)
+ */
+#define hyp_alternate_select(fname, orig, alt, cond)			\
+typeof(orig) * __hyp_text fname(void)					\
+{									\
+	typeof(alt) *val = orig;					\
+	asm volatile(ALTERNATIVE("nop		\n",			\
+				 "mov	%0, %1	\n",			\
+				 cond)					\
+		     : "+r" (val) : "r" (alt));				\
+	return val;							\
+}
+
+void __vgic_v2_save_state(struct kvm_vcpu *vcpu);
+void __vgic_v2_restore_state(struct kvm_vcpu *vcpu);
+
+void __vgic_v3_save_state(struct kvm_vcpu *vcpu);
+void __vgic_v3_restore_state(struct kvm_vcpu *vcpu);
+
+void __timer_save_state(struct kvm_vcpu *vcpu);
+void __timer_restore_state(struct kvm_vcpu *vcpu);
+
+void __sysreg_save_host_state(struct kvm_cpu_context *ctxt);
+void __sysreg_restore_host_state(struct kvm_cpu_context *ctxt);
+void __sysreg_save_guest_state(struct kvm_cpu_context *ctxt);
+void __sysreg_restore_guest_state(struct kvm_cpu_context *ctxt);
+void __sysreg32_save_state(struct kvm_vcpu *vcpu);
+void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
+
+void __debug_save_state(struct kvm_vcpu *vcpu,
+			struct kvm_guest_debug_arch *dbg,
+			struct kvm_cpu_context *ctxt);
+void __debug_restore_state(struct kvm_vcpu *vcpu,
+			   struct kvm_guest_debug_arch *dbg,
+			   struct kvm_cpu_context *ctxt);
+void __debug_cond_save_host_state(struct kvm_vcpu *vcpu);
+void __debug_cond_restore_host_state(struct kvm_vcpu *vcpu);
+
+void __fpsimd_save_state(struct user_fpsimd_state *fp_regs);
+void __fpsimd_restore_state(struct user_fpsimd_state *fp_regs);
+bool __fpsimd_enabled(void);
+
+u64 __guest_enter(struct kvm_vcpu *vcpu, struct kvm_cpu_context *host_ctxt);
+void __noreturn __hyp_do_panic(unsigned long, ...);
+
+#endif /* __ARM64_KVM_HYP_H__ */
+