KVM: ARM: Initial skeleton to compile KVM support

Targets KVM support for Cortex A-15 processors.

Contains all the framework components, make files, header files, some
tracing functionality, and basic user space API.

Only supported core is Cortex-A15 for now.

Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h.

Reviewed-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>

1 files changed, 106 insertions, 0 deletions

diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h
new file mode 100644
index 000000000000..1083327b5fcd
--- /dev/null
+++ b/arch/arm/include/uapi/asm/kvm.h
@@ -0,0 +1,106 @@
+/*
+ * 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, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef __ARM_KVM_H__
+#define __ARM_KVM_H__
+
+#include <linux/types.h>
+#include <asm/ptrace.h>
+
+#define __KVM_HAVE_GUEST_DEBUG
+
+#define KVM_REG_SIZE(id)                                                \
+        (1U << (((id) & KVM_REG_SIZE_MASK) >> KVM_REG_SIZE_SHIFT))
+
+/* Valid for svc_regs, abt_regs, und_regs, irq_regs in struct kvm_regs */
+#define KVM_ARM_SVC_sp          svc_regs[0]
+#define KVM_ARM_SVC_lr          svc_regs[1]
+#define KVM_ARM_SVC_spsr        svc_regs[2]
+#define KVM_ARM_ABT_sp          abt_regs[0]
+#define KVM_ARM_ABT_lr          abt_regs[1]
+#define KVM_ARM_ABT_spsr        abt_regs[2]
+#define KVM_ARM_UND_sp          und_regs[0]
+#define KVM_ARM_UND_lr          und_regs[1]
+#define KVM_ARM_UND_spsr        und_regs[2]
+#define KVM_ARM_IRQ_sp          irq_regs[0]
+#define KVM_ARM_IRQ_lr          irq_regs[1]
+#define KVM_ARM_IRQ_spsr        irq_regs[2]
+
+/* Valid only for fiq_regs in struct kvm_regs */
+#define KVM_ARM_FIQ_r8          fiq_regs[0]
+#define KVM_ARM_FIQ_r9          fiq_regs[1]
+#define KVM_ARM_FIQ_r10         fiq_regs[2]
+#define KVM_ARM_FIQ_fp          fiq_regs[3]
+#define KVM_ARM_FIQ_ip          fiq_regs[4]
+#define KVM_ARM_FIQ_sp          fiq_regs[5]
+#define KVM_ARM_FIQ_lr          fiq_regs[6]
+#define KVM_ARM_FIQ_spsr        fiq_regs[7]
+
+struct kvm_regs {
+        struct pt_regs usr_regs;/* R0_usr - R14_usr, PC, CPSR */
+        __u32 svc_regs[3];      /* SP_svc, LR_svc, SPSR_svc */
+        __u32 abt_regs[3];      /* SP_abt, LR_abt, SPSR_abt */
+        __u32 und_regs[3];      /* SP_und, LR_und, SPSR_und */
+        __u32 irq_regs[3];      /* SP_irq, LR_irq, SPSR_irq */
+        __u32 fiq_regs[8];      /* R8_fiq - R14_fiq, SPSR_fiq */
+};
+
+/* Supported Processor Types */
+#define KVM_ARM_TARGET_CORTEX_A15       0
+#define KVM_ARM_NUM_TARGETS             1
+
+struct kvm_vcpu_init {
+        __u32 target;
+        __u32 features[7];
+};
+
+struct kvm_sregs {
+};
+
+struct kvm_fpu {
+};
+
+struct kvm_guest_debug_arch {
+};
+
+struct kvm_debug_exit_arch {
+};
+
+struct kvm_sync_regs {
+};
+
+struct kvm_arch_memory_slot {
+};
+
+/* If you need to interpret the index values, here is the key: */
+#define KVM_REG_ARM_COPROC_MASK         0x000000000FFF0000
+#define KVM_REG_ARM_COPROC_SHIFT        16
+#define KVM_REG_ARM_32_OPC2_MASK        0x0000000000000007
+#define KVM_REG_ARM_32_OPC2_SHIFT       0
+#define KVM_REG_ARM_OPC1_MASK           0x0000000000000078
+#define KVM_REG_ARM_OPC1_SHIFT          3
+#define KVM_REG_ARM_CRM_MASK            0x0000000000000780
+#define KVM_REG_ARM_CRM_SHIFT           7
+#define KVM_REG_ARM_32_CRN_MASK         0x0000000000007800
+#define KVM_REG_ARM_32_CRN_SHIFT        11
+
+/* Normal registers are mapped as coprocessor 16. */
+#define KVM_REG_ARM_CORE                (0x0010 << KVM_REG_ARM_COPROC_SHIFT)
+#define KVM_REG_ARM_CORE_REG(name)      (offsetof(struct kvm_regs, name) / 4)
+
+#endif /* __ARM_KVM_H__ */