diff mbox series

[22/26] KVM: arm64: Disintegrate SPSR array

Message ID 20200422120050.3693593-23-maz@kernel.org (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: Preliminary NV patches | expand

Commit Message

Marc Zyngier April 22, 2020, noon UTC 
As we're about to move SPSR_EL1 into the VNCR page, we need to
disassociate it from the rest of the 32bit cruft. Let's break
the array into individual fields.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/kvm_emulate.h |  4 ++--
 arch/arm64/include/asm/kvm_host.h    |  6 ++++-
 arch/arm64/kvm/guest.c               | 19 +++++++++++----
 arch/arm64/kvm/hyp/sysreg-sr.c       | 28 ++++++++--------------
 arch/arm64/kvm/regmap.c              | 35 +++++++++++++++++++++++++---
 5 files changed, 63 insertions(+), 29 deletions(-)

Comments

James Morse May 26, 2020, 4:30 p.m. UTC | #1 
Hi Marc,

On 22/04/2020 13:00, Marc Zyngier wrote:
> As we're about to move SPSR_EL1 into the VNCR page, we need to
> disassociate it from the rest of the 32bit cruft. Let's break
> the array into individual fields.

Reviewed-by: James Morse <james.morse@arm.com>


Thanks,

James
diff mbox series

Patch

diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 1b8a396528851..6eb48c1f324d5 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -182,7 +182,7 @@  static inline unsigned long vcpu_read_spsr(const struct kvm_vcpu *vcpu)
 	if (vcpu->arch.sysregs_loaded_on_cpu)
 		return read_sysreg_el1(SYS_SPSR);
 	else
-		return vcpu->arch.ctxt.spsr[KVM_SPSR_EL1];
+		return vcpu->arch.ctxt.spsr_el1;
 }
 
 static inline void vcpu_write_spsr(struct kvm_vcpu *vcpu, unsigned long v)
@@ -195,7 +195,7 @@  static inline void vcpu_write_spsr(struct kvm_vcpu *vcpu, unsigned long v)
 	if (vcpu->arch.sysregs_loaded_on_cpu)
 		write_sysreg_el1(v, SYS_SPSR);
 	else
-		vcpu->arch.ctxt.spsr[KVM_SPSR_EL1] = v;
+		vcpu->arch.ctxt.spsr_el1 = v;
 }
 
 /*
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 4eca55c21c158..a918f33074b15 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -240,7 +240,11 @@  enum vcpu_sysreg {
 struct kvm_cpu_context {
 	struct user_pt_regs regs;	/* sp = sp_el0 */
 
-	u64	spsr[KVM_NR_SPSR];
+	u64	spsr_el1;		/* aka spsr_svc */
+	u64	spsr_abt;
+	u64	spsr_und;
+	u64	spsr_irq;
+	u64	spsr_fiq;
 
 	struct user_fpsimd_state fp_regs;
 
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 0f3315bc23ad9..6e655ea6c98d0 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -128,11 +128,20 @@  static void *core_reg_addr(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 	case KVM_REG_ARM_CORE_REG(elr_el1):
 		return __ctxt_sys_reg(&vcpu->arch.ctxt, ELR_EL1);
 
-	case KVM_REG_ARM_CORE_REG(spsr[0]) ...
-	     KVM_REG_ARM_CORE_REG(spsr[KVM_NR_SPSR - 1]):
-		off -= KVM_REG_ARM_CORE_REG(spsr[0]);
-		off /= 2;
-		return &vcpu->arch.ctxt.spsr[off];
+	case KVM_REG_ARM_CORE_REG(spsr[KVM_SPSR_EL1]):
+		return &vcpu->arch.ctxt.spsr_el1;
+
+	case KVM_REG_ARM_CORE_REG(spsr[KVM_SPSR_ABT]):
+		return &vcpu->arch.ctxt.spsr_abt;
+
+	case KVM_REG_ARM_CORE_REG(spsr[KVM_SPSR_UND]):
+		return &vcpu->arch.ctxt.spsr_und;
+
+	case KVM_REG_ARM_CORE_REG(spsr[KVM_SPSR_IRQ]):
+		return &vcpu->arch.ctxt.spsr_irq;
+
+	case KVM_REG_ARM_CORE_REG(spsr[KVM_SPSR_FIQ]):
+		return &vcpu->arch.ctxt.spsr_fiq;
 
 	case KVM_REG_ARM_CORE_REG(fp_regs.vregs[0]) ...
 	     KVM_REG_ARM_CORE_REG(fp_regs.vregs[31]):
diff --git a/arch/arm64/kvm/hyp/sysreg-sr.c b/arch/arm64/kvm/hyp/sysreg-sr.c
index 7ff3b5f3c39d8..c932ace46c9df 100644
--- a/arch/arm64/kvm/hyp/sysreg-sr.c
+++ b/arch/arm64/kvm/hyp/sysreg-sr.c
@@ -63,7 +63,7 @@  static void __hyp_text __sysreg_save_el1_state(struct kvm_cpu_context *ctxt)
 
 	ctxt_sys_reg(ctxt, SP_EL1)	= read_sysreg(sp_el1);
 	ctxt_sys_reg(ctxt, ELR_EL1)	= read_sysreg_el1(SYS_ELR);
-	ctxt->spsr[KVM_SPSR_EL1]	= read_sysreg_el1(SYS_SPSR);
+	ctxt->spsr_el1			= read_sysreg_el1(SYS_SPSR);
 }
 
 static void __hyp_text __sysreg_save_el2_return_state(struct kvm_cpu_context *ctxt)
@@ -168,7 +168,7 @@  static void __hyp_text __sysreg_restore_el1_state(struct kvm_cpu_context *ctxt)
 
 	write_sysreg(ctxt_sys_reg(ctxt, SP_EL1),	sp_el1);
 	write_sysreg_el1(ctxt_sys_reg(ctxt, ELR_EL1),	SYS_ELR);
-	write_sysreg_el1(ctxt->spsr[KVM_SPSR_EL1],	SYS_SPSR);
+	write_sysreg_el1(ctxt->spsr_el1,		SYS_SPSR);
 }
 
 static void __hyp_text
@@ -221,17 +221,13 @@  NOKPROBE_SYMBOL(sysreg_restore_guest_state_vhe);
 
 void __hyp_text __sysreg32_save_state(struct kvm_vcpu *vcpu)
 {
-	u64 *spsr;
-
 	if (!vcpu_el1_is_32bit(vcpu))
 		return;
 
-	spsr = vcpu->arch.ctxt.spsr;
-
-	spsr[KVM_SPSR_ABT] = read_sysreg(spsr_abt);
-	spsr[KVM_SPSR_UND] = read_sysreg(spsr_und);
-	spsr[KVM_SPSR_IRQ] = read_sysreg(spsr_irq);
-	spsr[KVM_SPSR_FIQ] = read_sysreg(spsr_fiq);
+	vcpu->arch.ctxt.spsr_abt = read_sysreg(spsr_abt);
+	vcpu->arch.ctxt.spsr_und = read_sysreg(spsr_und);
+	vcpu->arch.ctxt.spsr_irq = read_sysreg(spsr_irq);
+	vcpu->arch.ctxt.spsr_fiq = read_sysreg(spsr_fiq);
 
 	__vcpu_sys_reg(vcpu, DACR32_EL2) = read_sysreg(dacr32_el2);
 	__vcpu_sys_reg(vcpu, IFSR32_EL2) = read_sysreg(ifsr32_el2);
@@ -242,17 +238,13 @@  void __hyp_text __sysreg32_save_state(struct kvm_vcpu *vcpu)
 
 void __hyp_text __sysreg32_restore_state(struct kvm_vcpu *vcpu)
 {
-	u64 *spsr;
-
 	if (!vcpu_el1_is_32bit(vcpu))
 		return;
 
-	spsr = vcpu->arch.ctxt.spsr;
-
-	write_sysreg(spsr[KVM_SPSR_ABT], spsr_abt);
-	write_sysreg(spsr[KVM_SPSR_UND], spsr_und);
-	write_sysreg(spsr[KVM_SPSR_IRQ], spsr_irq);
-	write_sysreg(spsr[KVM_SPSR_FIQ], spsr_fiq);
+	write_sysreg(vcpu->arch.ctxt.spsr_abt, spsr_abt);
+	write_sysreg(vcpu->arch.ctxt.spsr_und, spsr_und);
+	write_sysreg(vcpu->arch.ctxt.spsr_irq, spsr_irq);
+	write_sysreg(vcpu->arch.ctxt.spsr_fiq, spsr_fiq);
 
 	write_sysreg(__vcpu_sys_reg(vcpu, DACR32_EL2), dacr32_el2);
 	write_sysreg(__vcpu_sys_reg(vcpu, IFSR32_EL2), ifsr32_el2);
diff --git a/arch/arm64/kvm/regmap.c b/arch/arm64/kvm/regmap.c
index b1596f314087b..97c110810527e 100644
--- a/arch/arm64/kvm/regmap.c
+++ b/arch/arm64/kvm/regmap.c
@@ -147,8 +147,20 @@  unsigned long vcpu_read_spsr32(const struct kvm_vcpu *vcpu)
 {
 	int spsr_idx = vcpu_spsr32_mode(vcpu);
 
-	if (!vcpu->arch.sysregs_loaded_on_cpu)
-		return vcpu->arch.ctxt.spsr[spsr_idx];
+	if (!vcpu->arch.sysregs_loaded_on_cpu) {
+		switch (spsr_idx) {
+		case KVM_SPSR_SVC:
+			return vcpu->arch.ctxt.spsr_el1;
+		case KVM_SPSR_ABT:
+			return vcpu->arch.ctxt.spsr_abt;
+		case KVM_SPSR_UND:
+			return vcpu->arch.ctxt.spsr_und;
+		case KVM_SPSR_IRQ:
+			return vcpu->arch.ctxt.spsr_irq;
+		case KVM_SPSR_FIQ:
+			return vcpu->arch.ctxt.spsr_fiq;
+		}
+	}
 
 	switch (spsr_idx) {
 	case KVM_SPSR_SVC:
@@ -171,7 +183,24 @@  void vcpu_write_spsr32(struct kvm_vcpu *vcpu, unsigned long v)
 	int spsr_idx = vcpu_spsr32_mode(vcpu);
 
 	if (!vcpu->arch.sysregs_loaded_on_cpu) {
-		vcpu->arch.ctxt.spsr[spsr_idx] = v;
+		switch (spsr_idx) {
+		case KVM_SPSR_SVC:
+			vcpu->arch.ctxt.spsr_el1 = v;
+			break;
+		case KVM_SPSR_ABT:
+			vcpu->arch.ctxt.spsr_abt = v;
+			break;
+		case KVM_SPSR_UND:
+			vcpu->arch.ctxt.spsr_und = v;
+			break;
+		case KVM_SPSR_IRQ:
+			vcpu->arch.ctxt.spsr_irq = v;
+			break;
+		case KVM_SPSR_FIQ:
+			vcpu->arch.ctxt.spsr_fiq = v;
+			break;
+		}
+
 		return;
 	}