Merge tag 'kvm-arm-for-3.13-1' of git://git.linaro.org/people/cdall/linux-kvm-arm into next

Updates for KVM/ARM including cpu=host and Cortex-A7 support

16 files changed, 270 insertions, 134 deletions

diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 858aecf21db2..a89a5ee0b940 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2304,7 +2304,31 @@ Possible features:
           Depends on KVM_CAP_ARM_EL1_32BIT (arm64 only).
 
 
-4.83 KVM_GET_REG_LIST
+4.83 KVM_ARM_PREFERRED_TARGET
+
+Capability: basic
+Architectures: arm, arm64
+Type: vm ioctl
+Parameters: struct struct kvm_vcpu_init (out)
+Returns: 0 on success; -1 on error
+Errors:
+  ENODEV:    no preferred target available for the host
+
+This queries KVM for preferred CPU target type which can be emulated
+by KVM on underlying host.
+
+The ioctl returns struct kvm_vcpu_init instance containing information
+about preferred CPU target type and recommended features for it.  The
+kvm_vcpu_init->features bitmap returned will have feature bits set if
+the preferred target recommends setting these features, but this is
+not mandatory.
+
+The information returned by this ioctl can be used to prepare an instance
+of struct kvm_vcpu_init for KVM_ARM_VCPU_INIT ioctl which will result in
+in VCPU matching underlying host.
+
+
+4.84 KVM_GET_REG_LIST
 
 Capability: basic
 Architectures: arm, arm64
@@ -2323,8 +2347,7 @@ struct kvm_reg_list {
 This ioctl returns the guest registers that are supported for the
 KVM_GET_ONE_REG/KVM_SET_ONE_REG calls.
 
-
-4.84 KVM_ARM_SET_DEVICE_ADDR
+4.85 KVM_ARM_SET_DEVICE_ADDR
 
 Capability: KVM_CAP_ARM_SET_DEVICE_ADDR
 Architectures: arm, arm64
@@ -2362,7 +2385,7 @@ must be called after calling KVM_CREATE_IRQCHIP, but before calling
 KVM_RUN on any of the VCPUs.  Calling this ioctl twice for any of the
 base addresses will return -EEXIST.
 
-4.85 KVM_PPC_RTAS_DEFINE_TOKEN
+4.86 KVM_PPC_RTAS_DEFINE_TOKEN
 
 Capability: KVM_CAP_PPC_RTAS
 Architectures: ppc
diff --git a/arch/arm/include/asm/kvm_arm.h b/arch/arm/include/asm/kvm_arm.h
index 64e96960de29..d556f03bca17 100644
--- a/arch/arm/include/asm/kvm_arm.h
+++ b/arch/arm/include/asm/kvm_arm.h
@@ -95,12 +95,12 @@
 #define TTBCR_IRGN1     (3 << 24)
 #define TTBCR_EPD1      (1 << 23)
 #define TTBCR_A1        (1 << 22)
-#define TTBCR_T1SZ      (3 << 16)
+#define TTBCR_T1SZ      (7 << 16)
 #define TTBCR_SH0       (3 << 12)
 #define TTBCR_ORGN0     (3 << 10)
 #define TTBCR_IRGN0     (3 << 8)
 #define TTBCR_EPD0      (1 << 7)
-#define TTBCR_T0SZ      3
+#define TTBCR_T0SZ      (7 << 0)
 #define HTCR_MASK       (TTBCR_T0SZ | TTBCR_IRGN0 | TTBCR_ORGN0 | TTBCR_SH0)
 
 /* Hyp System Trap Register */
diff --git a/arch/arm/include/asm/kvm_asm.h b/arch/arm/include/asm/kvm_asm.h
index a2f43ddcc300..661da11f76f4 100644
--- a/arch/arm/include/asm/kvm_asm.h
+++ b/arch/arm/include/asm/kvm_asm.h
@@ -39,7 +39,7 @@
 #define c6_IFAR         17      /* Instruction Fault Address Register */
 #define c7_PAR          18      /* Physical Address Register */
 #define c7_PAR_high     19      /* PAR top 32 bits */
-#define c9_L2CTLR       20      /* Cortex A15 L2 Control Register */
+#define c9_L2CTLR       20      /* Cortex A15/A7 L2 Control Register */
 #define c10_PRRR        21      /* Primary Region Remap Register */
 #define c10_NMRR        22      /* Normal Memory Remap Register */
 #define c12_VBAR        23      /* Vector Base Address Register */
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index e45a74b62ac1..8a6f6db14ee4 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -149,6 +149,7 @@ struct kvm_vcpu_stat {
 struct kvm_vcpu_init;
 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
                         const struct kvm_vcpu_init *init);
+int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 struct kvm_one_reg;
diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h
index c1ee007523d7..c498b60c0505 100644
--- a/arch/arm/include/uapi/asm/kvm.h
+++ b/arch/arm/include/uapi/asm/kvm.h
@@ -63,7 +63,8 @@ struct kvm_regs {
 
 /* Supported Processor Types */
 #define KVM_ARM_TARGET_CORTEX_A15       0
-#define KVM_ARM_NUM_TARGETS             1
+#define KVM_ARM_TARGET_CORTEX_A7        1
+#define KVM_ARM_NUM_TARGETS             2
 
 /* KVM_ARM_SET_DEVICE_ADDR ioctl id encoding */
 #define KVM_ARM_DEVICE_TYPE_SHIFT       0
diff --git a/arch/arm/kvm/Makefile b/arch/arm/kvm/Makefile
index d99bee4950e5..789bca9e64a7 100644
--- a/arch/arm/kvm/Makefile
+++ b/arch/arm/kvm/Makefile
@@ -19,6 +19,6 @@ kvm-arm-y = $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o
 
 obj-y += kvm-arm.o init.o interrupts.o
 obj-y += arm.o handle_exit.o guest.o mmu.o emulate.o reset.o
-obj-y += coproc.o coproc_a15.o mmio.o psci.o perf.o
+obj-y += coproc.o coproc_a15.o coproc_a7.o mmio.o psci.o perf.o
 obj-$(CONFIG_KVM_ARM_VGIC) += $(KVM)/arm/vgic.o
 obj-$(CONFIG_KVM_ARM_TIMER) += $(KVM)/arm/arch_timer.o
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index 9c697db2787e..cc5adb9349ef 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -797,6 +797,19 @@ long kvm_arch_vm_ioctl(struct file *filp,
                         return -EFAULT;
                 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
         }
+        case KVM_ARM_PREFERRED_TARGET: {
+                int err;
+                struct kvm_vcpu_init init;
+
+                err = kvm_vcpu_preferred_target(&init);
+                if (err)
+                        return err;
+
+                if (copy_to_user(argp, &init, sizeof(init)))
+                        return -EFAULT;
+
+                return 0;
+        }
         default:
                 return -EINVAL;
         }
diff --git a/arch/arm/kvm/coproc.c b/arch/arm/kvm/coproc.c
index db9cf692d4dd..a629f2c1d0f9 100644
--- a/arch/arm/kvm/coproc.c
+++ b/arch/arm/kvm/coproc.c
@@ -71,6 +71,92 @@ int kvm_handle_cp14_access(struct kvm_vcpu *vcpu, struct kvm_run *run)
         return 1;
 }
 
+static void reset_mpidr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
+{
+        /*
+         * Compute guest MPIDR. No need to mess around with different clusters
+         * but we read the 'U' bit from the underlying hardware directly.
+         */
+        vcpu->arch.cp15[c0_MPIDR] = (read_cpuid_mpidr() & MPIDR_SMP_BITMASK)
+                                        | vcpu->vcpu_id;
+}
+
+/* TRM entries A7:4.3.31 A15:4.3.28 - RO WI */
+static bool access_actlr(struct kvm_vcpu *vcpu,
+                         const struct coproc_params *p,
+                         const struct coproc_reg *r)
+{
+        if (p->is_write)
+                return ignore_write(vcpu, p);
+
+        *vcpu_reg(vcpu, p->Rt1) = vcpu->arch.cp15[c1_ACTLR];
+        return true;
+}
+
+/* TRM entries A7:4.3.56, A15:4.3.60 - R/O. */
+static bool access_cbar(struct kvm_vcpu *vcpu,
+                        const struct coproc_params *p,
+                        const struct coproc_reg *r)
+{
+        if (p->is_write)
+                return write_to_read_only(vcpu, p);
+        return read_zero(vcpu, p);
+}
+
+/* TRM entries A7:4.3.49, A15:4.3.48 - R/O WI */
+static bool access_l2ctlr(struct kvm_vcpu *vcpu,
+                          const struct coproc_params *p,
+                          const struct coproc_reg *r)
+{
+        if (p->is_write)
+                return ignore_write(vcpu, p);
+
+        *vcpu_reg(vcpu, p->Rt1) = vcpu->arch.cp15[c9_L2CTLR];
+        return true;
+}
+
+static void reset_l2ctlr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
+{
+        u32 l2ctlr, ncores;
+
+        asm volatile("mrc p15, 1, %0, c9, c0, 2\n" : "=r" (l2ctlr));
+        l2ctlr &= ~(3 << 24);
+        ncores = atomic_read(&vcpu->kvm->online_vcpus) - 1;
+        l2ctlr |= (ncores & 3) << 24;
+
+        vcpu->arch.cp15[c9_L2CTLR] = l2ctlr;
+}
+
+static void reset_actlr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
+{
+        u32 actlr;
+
+        /* ACTLR contains SMP bit: make sure you create all cpus first! */
+        asm volatile("mrc p15, 0, %0, c1, c0, 1\n" : "=r" (actlr));
+        /* Make the SMP bit consistent with the guest configuration */
+        if (atomic_read(&vcpu->kvm->online_vcpus) > 1)
+                actlr |= 1U << 6;
+        else
+                actlr &= ~(1U << 6);
+
+        vcpu->arch.cp15[c1_ACTLR] = actlr;
+}
+
+/*
+ * TRM entries: A7:4.3.50, A15:4.3.49
+ * R/O WI (even if NSACR.NS_L2ERR, a write of 1 is ignored).
+ */
+static bool access_l2ectlr(struct kvm_vcpu *vcpu,
+                           const struct coproc_params *p,
+                           const struct coproc_reg *r)
+{
+        if (p->is_write)
+                return ignore_write(vcpu, p);
+
+        *vcpu_reg(vcpu, p->Rt1) = 0;
+        return true;
+}
+
 /* See note at ARM ARM B1.14.4 */
 static bool access_dcsw(struct kvm_vcpu *vcpu,
                         const struct coproc_params *p,
@@ -153,10 +239,22 @@ static bool pm_fake(struct kvm_vcpu *vcpu,
  *            registers preceding 32-bit ones.
  */
 static const struct coproc_reg cp15_regs[] = {
+        /* MPIDR: we use VMPIDR for guest access. */
+        { CRn( 0), CRm( 0), Op1( 0), Op2( 5), is32,
+                        NULL, reset_mpidr, c0_MPIDR },
+
         /* CSSELR: swapped by interrupt.S. */
         { CRn( 0), CRm( 0), Op1( 2), Op2( 0), is32,
                         NULL, reset_unknown, c0_CSSELR },
 
+        /* ACTLR: trapped by HCR.TAC bit. */
+        { CRn( 1), CRm( 0), Op1( 0), Op2( 1), is32,
+                        access_actlr, reset_actlr, c1_ACTLR },
+
+        /* CPACR: swapped by interrupt.S. */
+        { CRn( 1), CRm( 0), Op1( 0), Op2( 2), is32,
+                        NULL, reset_val, c1_CPACR, 0x00000000 },
+
         /* TTBR0/TTBR1: swapped by interrupt.S. */
         { CRm64( 2), Op1( 0), is64, NULL, reset_unknown64, c2_TTBR0 },
         { CRm64( 2), Op1( 1), is64, NULL, reset_unknown64, c2_TTBR1 },
@@ -195,6 +293,13 @@ static const struct coproc_reg cp15_regs[] = {
         { CRn( 7), CRm(10), Op1( 0), Op2( 2), is32, access_dcsw},
         { CRn( 7), CRm(14), Op1( 0), Op2( 2), is32, access_dcsw},
         /*
+         * L2CTLR access (guest wants to know #CPUs).
+         */
+        { CRn( 9), CRm( 0), Op1( 1), Op2( 2), is32,
+                        access_l2ctlr, reset_l2ctlr, c9_L2CTLR },
+        { CRn( 9), CRm( 0), Op1( 1), Op2( 3), is32, access_l2ectlr},
+
+        /*
          * Dummy performance monitor implementation.
          */
         { CRn( 9), CRm(12), Op1( 0), Op2( 0), is32, access_pmcr},
@@ -234,6 +339,9 @@ static const struct coproc_reg cp15_regs[] = {
         /* CNTKCTL: swapped by interrupt.S. */
         { CRn(14), CRm( 1), Op1( 0), Op2( 0), is32,
                         NULL, reset_val, c14_CNTKCTL, 0x00000000 },
+
+        /* The Configuration Base Address Register. */
+        { CRn(15), CRm( 0), Op1( 4), Op2( 0), is32, access_cbar},
 };
 
 /* Target specific emulation tables */
@@ -241,6 +349,12 @@ static struct kvm_coproc_target_table *target_tables[KVM_ARM_NUM_TARGETS];
 
 void kvm_register_target_coproc_table(struct kvm_coproc_target_table *table)
 {
+        unsigned int i;
+
+        for (i = 1; i < table->num; i++)
+                BUG_ON(cmp_reg(&table->table[i-1],
+                               &table->table[i]) >= 0);
+
         target_tables[table->target] = table;
 }
 
diff --git a/arch/arm/kvm/coproc_a15.c b/arch/arm/kvm/coproc_a15.c
index cf93472b9dd6..bb0cac1410cc 100644
--- a/arch/arm/kvm/coproc_a15.c
+++ b/arch/arm/kvm/coproc_a15.c
@@ -17,101 +17,12 @@
  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  */
 #include <linux/kvm_host.h>
-#include <asm/cputype.h>
-#include <asm/kvm_arm.h>
-#include <asm/kvm_host.h>
-#include <asm/kvm_emulate.h>
 #include <asm/kvm_coproc.h>
+#include <asm/kvm_emulate.h>
 #include <linux/init.h>
 
-static void reset_mpidr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
-{
-        /*
-         * Compute guest MPIDR:
-         * (Even if we present only one VCPU to the guest on an SMP
-         * host we don't set the U bit in the MPIDR, or vice versa, as
-         * revealing the underlying hardware properties is likely to
-         * be the best choice).
-         */
-        vcpu->arch.cp15[c0_MPIDR] = (read_cpuid_mpidr() & ~MPIDR_LEVEL_MASK)
-                | (vcpu->vcpu_id & MPIDR_LEVEL_MASK);
-}
-
 #include "coproc.h"
 
-/* A15 TRM 4.3.28: RO WI */
-static bool access_actlr(struct kvm_vcpu *vcpu,
-                         const struct coproc_params *p,
-                         const struct coproc_reg *r)
-{
-        if (p->is_write)
-                return ignore_write(vcpu, p);
-
-        *vcpu_reg(vcpu, p->Rt1) = vcpu->arch.cp15[c1_ACTLR];
-        return true;
-}
-
-/* A15 TRM 4.3.60: R/O. */
-static bool access_cbar(struct kvm_vcpu *vcpu,
-                        const struct coproc_params *p,
-                        const struct coproc_reg *r)
-{
-        if (p->is_write)
-                return write_to_read_only(vcpu, p);
-        return read_zero(vcpu, p);
-}
-
-/* A15 TRM 4.3.48: R/O WI. */
-static bool access_l2ctlr(struct kvm_vcpu *vcpu,
-                          const struct coproc_params *p,
-                          const struct coproc_reg *r)
-{
-        if (p->is_write)
-                return ignore_write(vcpu, p);
-
-        *vcpu_reg(vcpu, p->Rt1) = vcpu->arch.cp15[c9_L2CTLR];
-        return true;
-}
-
-static void reset_l2ctlr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
-{
-        u32 l2ctlr, ncores;
-
-        asm volatile("mrc p15, 1, %0, c9, c0, 2\n" : "=r" (l2ctlr));
-        l2ctlr &= ~(3 << 24);
-        ncores = atomic_read(&vcpu->kvm->online_vcpus) - 1;
-        l2ctlr |= (ncores & 3) << 24;
-
-        vcpu->arch.cp15[c9_L2CTLR] = l2ctlr;
-}
-
-static void reset_actlr(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
-{
-        u32 actlr;
-
-        /* ACTLR contains SMP bit: make sure you create all cpus first! */
-        asm volatile("mrc p15, 0, %0, c1, c0, 1\n" : "=r" (actlr));
-        /* Make the SMP bit consistent with the guest configuration */
-        if (atomic_read(&vcpu->kvm->online_vcpus) > 1)
-                actlr |= 1U << 6;
-        else
-                actlr &= ~(1U << 6);
-
-        vcpu->arch.cp15[c1_ACTLR] = actlr;
-}
-
-/* A15 TRM 4.3.49: R/O WI (even if NSACR.NS_L2ERR, a write of 1 is ignored). */
-static bool access_l2ectlr(struct kvm_vcpu *vcpu,
-                           const struct coproc_params *p,
-                           const struct coproc_reg *r)
-{
-        if (p->is_write)
-                return ignore_write(vcpu, p);
-
-        *vcpu_reg(vcpu, p->Rt1) = 0;
-        return true;
-}
-
 /*
  * A15-specific CP15 registers.
  * CRn denotes the primary register number, but is copied to the CRm in the
@@ -121,29 +32,9 @@ static bool access_l2ectlr(struct kvm_vcpu *vcpu,
  *            registers preceding 32-bit ones.
  */
 static const struct coproc_reg a15_regs[] = {
-        /* MPIDR: we use VMPIDR for guest access. */
-        { CRn( 0), CRm( 0), Op1( 0), Op2( 5), is32,
-                        NULL, reset_mpidr, c0_MPIDR },
-
         /* SCTLR: swapped by interrupt.S. */
         { CRn( 1), CRm( 0), Op1( 0), Op2( 0), is32,
                         NULL, reset_val, c1_SCTLR, 0x00C50078 },
-        /* ACTLR: trapped by HCR.TAC bit. */
-        { CRn( 1), CRm( 0), Op1( 0), Op2( 1), is32,
-                        access_actlr, reset_actlr, c1_ACTLR },
-        /* CPACR: swapped by interrupt.S. */
-        { CRn( 1), CRm( 0), Op1( 0), Op2( 2), is32,
-                        NULL, reset_val, c1_CPACR, 0x00000000 },
-
-        /*
-         * L2CTLR access (guest wants to know #CPUs).
-         */
-        { CRn( 9), CRm( 0), Op1( 1), Op2( 2), is32,
-                        access_l2ctlr, reset_l2ctlr, c9_L2CTLR },
-        { CRn( 9), CRm( 0), Op1( 1), Op2( 3), is32, access_l2ectlr},
-
-        /* The Configuration Base Address Register. */
-        { CRn(15), CRm( 0), Op1( 4), Op2( 0), is32, access_cbar},
 };
 
 static struct kvm_coproc_target_table a15_target_table = {
@@ -154,12 +45,6 @@ static struct kvm_coproc_target_table a15_target_table = {
 
 static int __init coproc_a15_init(void)
 {
-        unsigned int i;
-
-        for (i = 1; i < ARRAY_SIZE(a15_regs); i++)
-                BUG_ON(cmp_reg(&a15_regs[i-1],
-                               &a15_regs[i]) >= 0);
-
         kvm_register_target_coproc_table(&a15_target_table);
         return 0;
 }
diff --git a/arch/arm/kvm/coproc_a7.c b/arch/arm/kvm/coproc_a7.c
new file mode 100644
index 000000000000..1df767331588
--- /dev/null
+++ b/arch/arm/kvm/coproc_a7.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Copyright (C) 2013 - ARM Ltd
+ *
+ * Authors: Rusty Russell <rusty@rustcorp.au>
+ *          Christoffer Dall <c.dall@virtualopensystems.com>
+ *          Jonathan Austin <jonathan.austin@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, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+#include <linux/kvm_host.h>
+#include <asm/kvm_coproc.h>
+#include <asm/kvm_emulate.h>
+#include <linux/init.h>
+
+#include "coproc.h"
+
+/*
+ * Cortex-A7 specific CP15 registers.
+ * CRn denotes the primary register number, but is copied to the CRm in the
+ * user space API for 64-bit register access in line with the terminology used
+ * in the ARM ARM.
+ * Important: Must be sorted ascending by CRn, CRM, Op1, Op2 and with 64-bit
+ *            registers preceding 32-bit ones.
+ */
+static const struct coproc_reg a7_regs[] = {
+        /* SCTLR: swapped by interrupt.S. */
+        { CRn( 1), CRm( 0), Op1( 0), Op2( 0), is32,
+                        NULL, reset_val, c1_SCTLR, 0x00C50878 },
+};
+
+static struct kvm_coproc_target_table a7_target_table = {
+        .target = KVM_ARM_TARGET_CORTEX_A7,
+        .table = a7_regs,
+        .num = ARRAY_SIZE(a7_regs),
+};
+
+static int __init coproc_a7_init(void)
+{
+        kvm_register_target_coproc_table(&a7_target_table);
+        return 0;
+}
+late_initcall(coproc_a7_init);
diff --git a/arch/arm/kvm/emulate.c b/arch/arm/kvm/emulate.c
index bdede9e7da51..d6c005283678 100644
--- a/arch/arm/kvm/emulate.c
+++ b/arch/arm/kvm/emulate.c
@@ -354,7 +354,7 @@ static void inject_abt(struct kvm_vcpu *vcpu, bool is_pabt, unsigned long addr)
         *vcpu_pc(vcpu) = exc_vector_base(vcpu) + vect_offset;
 
         if (is_pabt) {
-                /* Set DFAR and DFSR */
+                /* Set IFAR and IFSR */
                 vcpu->arch.cp15[c6_IFAR] = addr;
                 is_lpae = (vcpu->arch.cp15[c2_TTBCR] >> 31);
                 /* Always give debug fault for now - should give guest a clue */
diff --git a/arch/arm/kvm/guest.c b/arch/arm/kvm/guest.c
index 152d03612181..20f8d97904af 100644
--- a/arch/arm/kvm/guest.c
+++ b/arch/arm/kvm/guest.c
@@ -190,6 +190,8 @@ int __attribute_const__ kvm_target_cpu(void)
                 return -EINVAL;
 
         switch (part_number) {
+        case ARM_CPU_PART_CORTEX_A7:
+                return KVM_ARM_TARGET_CORTEX_A7;
         case ARM_CPU_PART_CORTEX_A15:
                 return KVM_ARM_TARGET_CORTEX_A15;
         default:
@@ -202,7 +204,7 @@ int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
 {
         unsigned int i;
 
-        /* We can only do a cortex A15 for now. */
+        /* We can only cope with guest==host and only on A15/A7 (for now). */
         if (init->target != kvm_target_cpu())
                 return -EINVAL;
 
@@ -222,6 +224,26 @@ int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
         return kvm_reset_vcpu(vcpu);
 }
 
+int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
+{
+        int target = kvm_target_cpu();
+
+        if (target < 0)
+                return -ENODEV;
+
+        memset(init, 0, sizeof(*init));
+
+        /*
+         * For now, we don't return any features.
+         * In future, we might use features to return target
+         * specific features available for the preferred
+         * target type.
+         */
+        init->target = (__u32)target;
+
+        return 0;
+}
+
 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 {
         return -EINVAL;
diff --git a/arch/arm/kvm/reset.c b/arch/arm/kvm/reset.c
index 71e08baee209..d9bbd834f188 100644
--- a/arch/arm/kvm/reset.c
+++ b/arch/arm/kvm/reset.c
@@ -30,16 +30,16 @@
 #include <kvm/arm_arch_timer.h>
 
 /******************************************************************************
- * Cortex-A15 Reset Values
+ * Cortex-A15 and Cortex-A7 Reset Values
  */
 
-static const int a15_max_cpu_idx = 3;
+static const int cortexa_max_cpu_idx = 3;
 
-static struct kvm_regs a15_regs_reset = {
+static struct kvm_regs cortexa_regs_reset = {
         .usr_regs.ARM_cpsr = SVC_MODE | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT,
 };
 
-static const struct kvm_irq_level a15_vtimer_irq = {
+static const struct kvm_irq_level cortexa_vtimer_irq = {
         { .irq = 27 },
         .level = 1,
 };
@@ -62,12 +62,13 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
         const struct kvm_irq_level *cpu_vtimer_irq;
 
         switch (vcpu->arch.target) {
+        case KVM_ARM_TARGET_CORTEX_A7:
         case KVM_ARM_TARGET_CORTEX_A15:
-                if (vcpu->vcpu_id > a15_max_cpu_idx)
+                if (vcpu->vcpu_id > cortexa_max_cpu_idx)
                         return -EINVAL;
-                cpu_reset = &a15_regs_reset;
+                cpu_reset = &cortexa_regs_reset;
                 vcpu->arch.midr = read_cpuid_id();
-                cpu_vtimer_irq = &a15_vtimer_irq;
+                cpu_vtimer_irq = &cortexa_vtimer_irq;
                 break;
         default:
                 return -ENODEV;
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 54c064f622aa..5d85a02d1231 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -146,6 +146,7 @@ struct kvm_vcpu_stat {
 struct kvm_vcpu_init;
 int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
                         const struct kvm_vcpu_init *init);
+int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 struct kvm_one_reg;
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 2c3ff67a8ecb..3f0731e53274 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -248,6 +248,26 @@ int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
         return kvm_reset_vcpu(vcpu);
 }
 
+int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init)
+{
+        int target = kvm_target_cpu();
+
+        if (target < 0)
+                return -ENODEV;
+
+        memset(init, 0, sizeof(*init));
+
+        /*
+         * For now, we don't return any features.
+         * In future, we might use features to return target
+         * specific features available for the preferred
+         * target type.
+         */
+        init->target = (__u32)target;
+
+        return 0;
+}
+
 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 {
         return -EINVAL;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 99c25338ede8..e32e776f20c0 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1012,6 +1012,7 @@ struct kvm_s390_ucas_mapping {
 /* VM is being stopped by host */
 #define KVM_KVMCLOCK_CTRL         _IO(KVMIO,   0xad)
 #define KVM_ARM_VCPU_INIT         _IOW(KVMIO,  0xae, struct kvm_vcpu_init)
+#define KVM_ARM_PREFERRED_TARGET  _IOR(KVMIO,  0xaf, struct kvm_vcpu_init)
 #define KVM_GET_REG_LIST          _IOWR(KVMIO, 0xb0, struct kvm_reg_list)
 
 #define KVM_DEV_ASSIGN_ENABLE_IOMMU     (1 << 0)