arm64: KVM: Turn system register numbers to an enum

Having the system register numbers as #defines has been a pain
since day one, as the ordering is pretty fragile, and moving
things around leads to renumbering and epic conflict resolutions.

Now that we're mostly acessing the sysreg file in C, an enum is
a much better type to use, and we can clean things up a bit.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>

arch/arm64/include/asm/kvm_asm.h

@@ -20,82 +20,6 @@
 
 #include <asm/virt.h>
 
-/*
- * 0 is reserved as an invalid value.
- * Order *must* be kept in sync with the hyp switch code.
- */
-#define	MPIDR_EL1	1	/* MultiProcessor Affinity Register */
-#define	CSSELR_EL1	2	/* Cache Size Selection Register */
-#define	SCTLR_EL1	3	/* System Control Register */
-#define	ACTLR_EL1	4	/* Auxiliary Control Register */
-#define	CPACR_EL1	5	/* Coprocessor Access Control */
-#define	TTBR0_EL1	6	/* Translation Table Base Register 0 */
-#define	TTBR1_EL1	7	/* Translation Table Base Register 1 */
-#define	TCR_EL1		8	/* Translation Control Register */
-#define	ESR_EL1		9	/* Exception Syndrome Register */
-#define	AFSR0_EL1	10	/* Auxilary Fault Status Register 0 */
-#define	AFSR1_EL1	11	/* Auxilary Fault Status Register 1 */
-#define	FAR_EL1		12	/* Fault Address Register */
-#define	MAIR_EL1	13	/* Memory Attribute Indirection Register */
-#define	VBAR_EL1	14	/* Vector Base Address Register */
-#define	CONTEXTIDR_EL1	15	/* Context ID Register */
-#define	TPIDR_EL0	16	/* Thread ID, User R/W */
-#define	TPIDRRO_EL0	17	/* Thread ID, User R/O */
-#define	TPIDR_EL1	18	/* Thread ID, Privileged */
-#define	AMAIR_EL1	19	/* Aux Memory Attribute Indirection Register */
-#define	CNTKCTL_EL1	20	/* Timer Control Register (EL1) */
-#define	PAR_EL1		21	/* Physical Address Register */
-#define MDSCR_EL1	22	/* Monitor Debug System Control Register */
-#define MDCCINT_EL1	23	/* Monitor Debug Comms Channel Interrupt Enable Reg */
-
-/* 32bit specific registers. Keep them at the end of the range */
-#define	DACR32_EL2	24	/* Domain Access Control Register */
-#define	IFSR32_EL2	25	/* Instruction Fault Status Register */
-#define	FPEXC32_EL2	26	/* Floating-Point Exception Control Register */
-#define	DBGVCR32_EL2	27	/* Debug Vector Catch Register */
-#define	NR_SYS_REGS	28
-
-/* 32bit mapping */
-#define c0_MPIDR	(MPIDR_EL1 * 2)	/* MultiProcessor ID Register */
-#define c0_CSSELR	(CSSELR_EL1 * 2)/* Cache Size Selection Register */
-#define c1_SCTLR	(SCTLR_EL1 * 2)	/* System Control Register */
-#define c1_ACTLR	(ACTLR_EL1 * 2)	/* Auxiliary Control Register */
-#define c1_CPACR	(CPACR_EL1 * 2)	/* Coprocessor Access Control */
-#define c2_TTBR0	(TTBR0_EL1 * 2)	/* Translation Table Base Register 0 */
-#define c2_TTBR0_high	(c2_TTBR0 + 1)	/* TTBR0 top 32 bits */
-#define c2_TTBR1	(TTBR1_EL1 * 2)	/* Translation Table Base Register 1 */
-#define c2_TTBR1_high	(c2_TTBR1 + 1)	/* TTBR1 top 32 bits */
-#define c2_TTBCR	(TCR_EL1 * 2)	/* Translation Table Base Control R. */
-#define c3_DACR		(DACR32_EL2 * 2)/* Domain Access Control Register */
-#define c5_DFSR		(ESR_EL1 * 2)	/* Data Fault Status Register */
-#define c5_IFSR		(IFSR32_EL2 * 2)/* Instruction Fault Status Register */
-#define c5_ADFSR	(AFSR0_EL1 * 2)	/* Auxiliary Data Fault Status R */
-#define c5_AIFSR	(AFSR1_EL1 * 2)	/* Auxiliary Instr Fault Status R */
-#define c6_DFAR		(FAR_EL1 * 2)	/* Data Fault Address Register */
-#define c6_IFAR		(c6_DFAR + 1)	/* Instruction Fault Address Register */
-#define c7_PAR		(PAR_EL1 * 2)	/* Physical Address Register */
-#define c7_PAR_high	(c7_PAR + 1)	/* PAR top 32 bits */
-#define c10_PRRR	(MAIR_EL1 * 2)	/* Primary Region Remap Register */
-#define c10_NMRR	(c10_PRRR + 1)	/* Normal Memory Remap Register */
-#define c12_VBAR	(VBAR_EL1 * 2)	/* Vector Base Address Register */
-#define c13_CID		(CONTEXTIDR_EL1 * 2)	/* Context ID Register */
-#define c13_TID_URW	(TPIDR_EL0 * 2)	/* Thread ID, User R/W */
-#define c13_TID_URO	(TPIDRRO_EL0 * 2)/* Thread ID, User R/O */
-#define c13_TID_PRIV	(TPIDR_EL1 * 2)	/* Thread ID, Privileged */
-#define c10_AMAIR0	(AMAIR_EL1 * 2)	/* Aux Memory Attr Indirection Reg */
-#define c10_AMAIR1	(c10_AMAIR0 + 1)/* Aux Memory Attr Indirection Reg */
-#define c14_CNTKCTL	(CNTKCTL_EL1 * 2) /* Timer Control Register (PL1) */
-
-#define cp14_DBGDSCRext	(MDSCR_EL1 * 2)
-#define cp14_DBGBCR0	(DBGBCR0_EL1 * 2)
-#define cp14_DBGBVR0	(DBGBVR0_EL1 * 2)
-#define cp14_DBGBXVR0	(cp14_DBGBVR0 + 1)
-#define cp14_DBGWCR0	(DBGWCR0_EL1 * 2)
-#define cp14_DBGWVR0	(DBGWVR0_EL1 * 2)
-#define cp14_DBGDCCINT	(MDCCINT_EL1 * 2)
-
-#define NR_COPRO_REGS	(NR_SYS_REGS * 2)
-
 #define ARM_EXCEPTION_IRQ	  0
 #define ARM_EXCEPTION_TRAP	  1
 

arch/arm64/include/asm/kvm_emulate.h

@@ -26,7 +26,6 @@
 
 #include <asm/esr.h>
 #include <asm/kvm_arm.h>
-#include <asm/kvm_asm.h>
 #include <asm/kvm_mmio.h>
 #include <asm/ptrace.h>
 #include <asm/cputype.h>

arch/arm64/include/asm/kvm_host.h

@@ -25,7 +25,6 @@
 #include <linux/types.h>
 #include <linux/kvm_types.h>
 #include <asm/kvm.h>
-#include <asm/kvm_asm.h>
 #include <asm/kvm_mmio.h>
 
 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
@@ -85,6 +84,86 @@ struct kvm_vcpu_fault_info {
 	u64 hpfar_el2;		/* Hyp IPA Fault Address Register */
 };
 
+/*
+ * 0 is reserved as an invalid value.
+ * Order should be kept in sync with the save/restore code.
+ */
+enum vcpu_sysreg {
+	__INVALID_SYSREG__,
+	MPIDR_EL1,	/* MultiProcessor Affinity Register */
+	CSSELR_EL1,	/* Cache Size Selection Register */
+	SCTLR_EL1,	/* System Control Register */
+	ACTLR_EL1,	/* Auxiliary Control Register */
+	CPACR_EL1,	/* Coprocessor Access Control */
+	TTBR0_EL1,	/* Translation Table Base Register 0 */
+	TTBR1_EL1,	/* Translation Table Base Register 1 */
+	TCR_EL1,	/* Translation Control Register */
+	ESR_EL1,	/* Exception Syndrome Register */
+	AFSR0_EL1,	/* Auxilary Fault Status Register 0 */
+	AFSR1_EL1,	/* Auxilary Fault Status Register 1 */
+	FAR_EL1,	/* Fault Address Register */
+	MAIR_EL1,	/* Memory Attribute Indirection Register */
+	VBAR_EL1,	/* Vector Base Address Register */
+	CONTEXTIDR_EL1,	/* Context ID Register */
+	TPIDR_EL0,	/* Thread ID, User R/W */
+	TPIDRRO_EL0,	/* Thread ID, User R/O */
+	TPIDR_EL1,	/* Thread ID, Privileged */
+	AMAIR_EL1,	/* Aux Memory Attribute Indirection Register */
+	CNTKCTL_EL1,	/* Timer Control Register (EL1) */
+	PAR_EL1,	/* Physical Address Register */
+	MDSCR_EL1,	/* Monitor Debug System Control Register */
+	MDCCINT_EL1,	/* Monitor Debug Comms Channel Interrupt Enable Reg */
+
+	/* 32bit specific registers. Keep them at the end of the range */
+	DACR32_EL2,	/* Domain Access Control Register */
+	IFSR32_EL2,	/* Instruction Fault Status Register */
+	FPEXC32_EL2,	/* Floating-Point Exception Control Register */
+	DBGVCR32_EL2,	/* Debug Vector Catch Register */
+
+	NR_SYS_REGS	/* Nothing after this line! */
+};
+
+/* 32bit mapping */
+#define c0_MPIDR	(MPIDR_EL1 * 2)	/* MultiProcessor ID Register */
+#define c0_CSSELR	(CSSELR_EL1 * 2)/* Cache Size Selection Register */
+#define c1_SCTLR	(SCTLR_EL1 * 2)	/* System Control Register */
+#define c1_ACTLR	(ACTLR_EL1 * 2)	/* Auxiliary Control Register */
+#define c1_CPACR	(CPACR_EL1 * 2)	/* Coprocessor Access Control */
+#define c2_TTBR0	(TTBR0_EL1 * 2)	/* Translation Table Base Register 0 */
+#define c2_TTBR0_high	(c2_TTBR0 + 1)	/* TTBR0 top 32 bits */
+#define c2_TTBR1	(TTBR1_EL1 * 2)	/* Translation Table Base Register 1 */
+#define c2_TTBR1_high	(c2_TTBR1 + 1)	/* TTBR1 top 32 bits */
+#define c2_TTBCR	(TCR_EL1 * 2)	/* Translation Table Base Control R. */
+#define c3_DACR		(DACR32_EL2 * 2)/* Domain Access Control Register */
+#define c5_DFSR		(ESR_EL1 * 2)	/* Data Fault Status Register */
+#define c5_IFSR		(IFSR32_EL2 * 2)/* Instruction Fault Status Register */
+#define c5_ADFSR	(AFSR0_EL1 * 2)	/* Auxiliary Data Fault Status R */
+#define c5_AIFSR	(AFSR1_EL1 * 2)	/* Auxiliary Instr Fault Status R */
+#define c6_DFAR		(FAR_EL1 * 2)	/* Data Fault Address Register */
+#define c6_IFAR		(c6_DFAR + 1)	/* Instruction Fault Address Register */
+#define c7_PAR		(PAR_EL1 * 2)	/* Physical Address Register */
+#define c7_PAR_high	(c7_PAR + 1)	/* PAR top 32 bits */
+#define c10_PRRR	(MAIR_EL1 * 2)	/* Primary Region Remap Register */
+#define c10_NMRR	(c10_PRRR + 1)	/* Normal Memory Remap Register */
+#define c12_VBAR	(VBAR_EL1 * 2)	/* Vector Base Address Register */
+#define c13_CID		(CONTEXTIDR_EL1 * 2)	/* Context ID Register */
+#define c13_TID_URW	(TPIDR_EL0 * 2)	/* Thread ID, User R/W */
+#define c13_TID_URO	(TPIDRRO_EL0 * 2)/* Thread ID, User R/O */
+#define c13_TID_PRIV	(TPIDR_EL1 * 2)	/* Thread ID, Privileged */
+#define c10_AMAIR0	(AMAIR_EL1 * 2)	/* Aux Memory Attr Indirection Reg */
+#define c10_AMAIR1	(c10_AMAIR0 + 1)/* Aux Memory Attr Indirection Reg */
+#define c14_CNTKCTL	(CNTKCTL_EL1 * 2) /* Timer Control Register (PL1) */
+
+#define cp14_DBGDSCRext	(MDSCR_EL1 * 2)
+#define cp14_DBGBCR0	(DBGBCR0_EL1 * 2)
+#define cp14_DBGBVR0	(DBGBVR0_EL1 * 2)
+#define cp14_DBGBXVR0	(cp14_DBGBVR0 + 1)
+#define cp14_DBGWCR0	(DBGWCR0_EL1 * 2)
+#define cp14_DBGWVR0	(DBGWVR0_EL1 * 2)
+#define cp14_DBGDCCINT	(MDCCINT_EL1 * 2)
+
+#define NR_COPRO_REGS	(NR_SYS_REGS * 2)
+
 struct kvm_cpu_context {
 	struct kvm_regs	gp_regs;
 	union {

arch/arm64/include/asm/kvm_mmio.h

@@ -19,7 +19,6 @@
 #define __ARM64_KVM_MMIO_H__
 
 #include <linux/kvm_host.h>
-#include <asm/kvm_asm.h>
 #include <asm/kvm_arm.h>
 
 /*

arch/arm64/kernel/asm-offsets.c

@@ -112,6 +112,7 @@ int main(void)
   DEFINE(CPU_ELR_EL1,		offsetof(struct kvm_regs, elr_el1));
   DEFINE(CPU_SPSR,		offsetof(struct kvm_regs, spsr));
   DEFINE(CPU_SYSREGS,		offsetof(struct kvm_cpu_context, sys_regs));
+  DEFINE(VCPU_FPEXC32_EL2,	offsetof(struct kvm_vcpu, arch.ctxt.sys_regs[FPEXC32_EL2]));
   DEFINE(VCPU_ESR_EL2,		offsetof(struct kvm_vcpu, arch.fault.esr_el2));
   DEFINE(VCPU_FAR_EL2,		offsetof(struct kvm_vcpu, arch.fault.far_el2));
   DEFINE(VCPU_HPFAR_EL2,	offsetof(struct kvm_vcpu, arch.fault.hpfar_el2));

arch/arm64/kvm/guest.c

@@ -28,7 +28,6 @@
 #include <asm/cputype.h>
 #include <asm/uaccess.h>
 #include <asm/kvm.h>
-#include <asm/kvm_asm.h>
 #include <asm/kvm_emulate.h>
 #include <asm/kvm_coproc.h>
 

arch/arm64/kvm/handle_exit.c

@@ -23,6 +23,7 @@
 #include <linux/kvm_host.h>
 
 #include <asm/esr.h>
+#include <asm/kvm_asm.h>
 #include <asm/kvm_coproc.h>
 #include <asm/kvm_emulate.h>
 #include <asm/kvm_mmu.h>

arch/arm64/kvm/hyp/debug-sr.c

@@ -18,6 +18,7 @@
 #include <linux/compiler.h>
 #include <linux/kvm_host.h>
 
+#include <asm/kvm_asm.h>
 #include <asm/kvm_mmu.h>
 
 #include "hyp.h"

arch/arm64/kvm/hyp/entry.S

@@ -27,7 +27,6 @@
 
 #define CPU_GP_REG_OFFSET(x)	(CPU_GP_REGS + x)
 #define CPU_XREG_OFFSET(x)	CPU_GP_REG_OFFSET(CPU_USER_PT_REGS + 8*x)
-#define CPU_SYSREG_OFFSET(x)	(CPU_SYSREGS + 8*x)
 
 	.text
 	.pushsection	.hyp.text, "ax"
@@ -150,7 +149,7 @@ ENTRY(__fpsimd_guest_restore)
 	// Skip restoring fpexc32 for AArch64 guests
 	mrs	x1, hcr_el2
 	tbnz	x1, #HCR_RW_SHIFT, 1f
-	ldr	x4, [x2, #CPU_SYSREG_OFFSET(FPEXC32_EL2)]
+	ldr	x4, [x3, #VCPU_FPEXC32_EL2]
 	msr	fpexc32_el2, x4
 1:
 	ldp	x4, lr, [sp], #16

arch/arm64/kvm/hyp/sysreg-sr.c

@@ -18,6 +18,7 @@
 #include <linux/compiler.h>
 #include <linux/kvm_host.h>
 
+#include <asm/kvm_asm.h>
 #include <asm/kvm_mmu.h>
 
 #include "hyp.h"

arch/arm64/kvm/sys_regs.c

@@ -29,6 +29,7 @@
 #include <asm/debug-monitors.h>
 #include <asm/esr.h>
 #include <asm/kvm_arm.h>
+#include <asm/kvm_asm.h>
 #include <asm/kvm_coproc.h>
 #include <asm/kvm_emulate.h>
 #include <asm/kvm_host.h>

virt/kvm/arm/vgic-v3.c

@@ -28,6 +28,7 @@
 
 #include <asm/kvm_emulate.h>
 #include <asm/kvm_arm.h>
+#include <asm/kvm_asm.h>
 #include <asm/kvm_mmu.h>
 
 /* These are for GICv2 emulation only */