arm64: KVM: 32bit GP register access

Allow access to the 32bit register file through the usual API.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

3 files changed, 183 insertions, 2 deletions

diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 6c1725e93b0b..20a1a3931d8d 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -28,6 +28,9 @@
 #include <asm/kvm_mmio.h>
 #include <asm/ptrace.h>
 
+unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num);
+unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu);
+
 void kvm_inject_undefined(struct kvm_vcpu *vcpu);
 void kvm_inject_dabt(struct kvm_vcpu *vcpu, unsigned long addr);
 void kvm_inject_pabt(struct kvm_vcpu *vcpu, unsigned long addr);
@@ -49,7 +52,7 @@ static inline unsigned long *vcpu_cpsr(const struct kvm_vcpu *vcpu)
 
 static inline bool vcpu_mode_is_32bit(const struct kvm_vcpu *vcpu)
 {
-        return false;   /* 32bit? Bahhh... */
+        return !!(*vcpu_cpsr(vcpu) & PSR_MODE32_BIT);
 }
 
 static inline bool kvm_condition_valid(const struct kvm_vcpu *vcpu)
@@ -64,16 +67,23 @@ static inline void kvm_skip_instr(struct kvm_vcpu *vcpu, bool is_wide_instr)
 
 static inline void vcpu_set_thumb(struct kvm_vcpu *vcpu)
 {
+        *vcpu_cpsr(vcpu) |= COMPAT_PSR_T_BIT;
 }
 
 static inline unsigned long *vcpu_reg(const struct kvm_vcpu *vcpu, u8 reg_num)
 {
+        if (vcpu_mode_is_32bit(vcpu))
+                return vcpu_reg32(vcpu, reg_num);
+
         return (unsigned long *)&vcpu_gp_regs(vcpu)->regs.regs[reg_num];
 }
 
 /* Get vcpu SPSR for current mode */
 static inline unsigned long *vcpu_spsr(const struct kvm_vcpu *vcpu)
 {
+        if (vcpu_mode_is_32bit(vcpu))
+                return vcpu_spsr32(vcpu);
+
         return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[KVM_SPSR_EL1];
 }
 
@@ -81,6 +91,9 @@ static inline bool vcpu_mode_priv(const struct kvm_vcpu *vcpu)
 {
         u32 mode = *vcpu_cpsr(vcpu) & PSR_MODE_MASK;
 
+        if (vcpu_mode_is_32bit(vcpu))
+                return mode > COMPAT_PSR_MODE_USR;
+
         return mode != PSR_MODE_EL0t;
 }
 
diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
index dca110556683..a2169ec8d93b 100644
--- a/arch/arm64/kvm/Makefile
+++ b/arch/arm64/kvm/Makefile
@@ -15,7 +15,7 @@ kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o
 kvm-$(CONFIG_KVM_ARM_HOST) += $(ARM)/arm.o $(ARM)/mmu.o $(ARM)/mmio.o
 kvm-$(CONFIG_KVM_ARM_HOST) += $(ARM)/psci.o $(ARM)/perf.o
 
-kvm-$(CONFIG_KVM_ARM_HOST) += inject_fault.o
+kvm-$(CONFIG_KVM_ARM_HOST) += inject_fault.o regmap.o
 kvm-$(CONFIG_KVM_ARM_HOST) += hyp.o hyp-init.o handle_exit.o
 kvm-$(CONFIG_KVM_ARM_HOST) += guest.o reset.o sys_regs.o sys_regs_generic_v8.o
 
diff --git a/arch/arm64/kvm/regmap.c b/arch/arm64/kvm/regmap.c
new file mode 100644
index 000000000000..bbc6ae32e4af
--- /dev/null
+++ b/arch/arm64/kvm/regmap.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from arch/arm/kvm/emulate.c:
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.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/mm.h>
+#include <linux/kvm_host.h>
+#include <asm/kvm_emulate.h>
+#include <asm/ptrace.h>
+
+#define VCPU_NR_MODES 6
+#define REG_OFFSET(_reg) \
+        (offsetof(struct user_pt_regs, _reg) / sizeof(unsigned long))
+
+#define USR_REG_OFFSET(R) REG_OFFSET(compat_usr(R))
+
+static const unsigned long vcpu_reg_offsets[VCPU_NR_MODES][16] = {
+        /* USR Registers */
+        {
+                USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+                USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+                USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+                USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+                USR_REG_OFFSET(12), USR_REG_OFFSET(13), USR_REG_OFFSET(14),
+                REG_OFFSET(pc)
+        },
+
+        /* FIQ Registers */
+        {
+                USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+                USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+                USR_REG_OFFSET(6), USR_REG_OFFSET(7),
+                REG_OFFSET(compat_r8_fiq),  /* r8 */
+                REG_OFFSET(compat_r9_fiq),  /* r9 */
+                REG_OFFSET(compat_r10_fiq), /* r10 */
+                REG_OFFSET(compat_r11_fiq), /* r11 */
+                REG_OFFSET(compat_r12_fiq), /* r12 */
+                REG_OFFSET(compat_sp_fiq),  /* r13 */
+                REG_OFFSET(compat_lr_fiq),  /* r14 */
+                REG_OFFSET(pc)
+        },
+
+        /* IRQ Registers */
+        {
+                USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+                USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+                USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+                USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+                USR_REG_OFFSET(12),
+                REG_OFFSET(compat_sp_irq), /* r13 */
+                REG_OFFSET(compat_lr_irq), /* r14 */
+                REG_OFFSET(pc)
+        },
+
+        /* SVC Registers */
+        {
+                USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+                USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+                USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+                USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+                USR_REG_OFFSET(12),
+                REG_OFFSET(compat_sp_svc), /* r13 */
+                REG_OFFSET(compat_lr_svc), /* r14 */
+                REG_OFFSET(pc)
+        },
+
+        /* ABT Registers */
+        {
+                USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+                USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+                USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+                USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+                USR_REG_OFFSET(12),
+                REG_OFFSET(compat_sp_abt), /* r13 */
+                REG_OFFSET(compat_lr_abt), /* r14 */
+                REG_OFFSET(pc)
+        },
+
+        /* UND Registers */
+        {
+                USR_REG_OFFSET(0), USR_REG_OFFSET(1), USR_REG_OFFSET(2),
+                USR_REG_OFFSET(3), USR_REG_OFFSET(4), USR_REG_OFFSET(5),
+                USR_REG_OFFSET(6), USR_REG_OFFSET(7), USR_REG_OFFSET(8),
+                USR_REG_OFFSET(9), USR_REG_OFFSET(10), USR_REG_OFFSET(11),
+                USR_REG_OFFSET(12),
+                REG_OFFSET(compat_sp_und), /* r13 */
+                REG_OFFSET(compat_lr_und), /* r14 */
+                REG_OFFSET(pc)
+        },
+};
+
+/*
+ * Return a pointer to the register number valid in the current mode of
+ * the virtual CPU.
+ */
+unsigned long *vcpu_reg32(const struct kvm_vcpu *vcpu, u8 reg_num)
+{
+        unsigned long *reg_array = (unsigned long *)&vcpu->arch.ctxt.gp_regs.regs;
+        unsigned long mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK;
+
+        switch (mode) {
+        case COMPAT_PSR_MODE_USR ... COMPAT_PSR_MODE_SVC:
+                mode &= ~PSR_MODE32_BIT; /* 0 ... 3 */
+                break;
+
+        case COMPAT_PSR_MODE_ABT:
+                mode = 4;
+                break;
+
+        case COMPAT_PSR_MODE_UND:
+                mode = 5;
+                break;
+
+        case COMPAT_PSR_MODE_SYS:
+                mode = 0;       /* SYS maps to USR */
+                break;
+
+        default:
+                BUG();
+        }
+
+        return reg_array + vcpu_reg_offsets[mode][reg_num];
+}
+
+/*
+ * Return the SPSR for the current mode of the virtual CPU.
+ */
+unsigned long *vcpu_spsr32(const struct kvm_vcpu *vcpu)
+{
+        unsigned long mode = *vcpu_cpsr(vcpu) & COMPAT_PSR_MODE_MASK;
+        switch (mode) {
+        case COMPAT_PSR_MODE_SVC:
+                mode = KVM_SPSR_SVC;
+                break;
+        case COMPAT_PSR_MODE_ABT:
+                mode = KVM_SPSR_ABT;
+                break;
+        case COMPAT_PSR_MODE_UND:
+                mode = KVM_SPSR_UND;
+                break;
+        case COMPAT_PSR_MODE_IRQ:
+                mode = KVM_SPSR_IRQ;
+                break;
+        case COMPAT_PSR_MODE_FIQ:
+                mode = KVM_SPSR_FIQ;
+                break;
+        default:
+                BUG();
+        }
+
+        return (unsigned long *)&vcpu_gp_regs(vcpu)->spsr[mode];
+}