Message-Id: <1369083686-27524-6-git-send-email-ddaney.cavm@gmail.com>
Date:	Mon, 20 May 2013 14:01:26 -0700
From:	David Daney <ddaney.cavm@...il.com>
To:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	kvm@...r.kernel.org, Sanjay Lal <sanjayl@...asys.com>
Cc:	linux-kernel@...r.kernel.org, David Daney <david.daney@...ium.com>
Subject: [PATCH v3 5/5] mips/kvm: Fix ABI by moving manipulation of CP0 registers to KVM_{G,S}ET_MSRS

From: David Daney <david.daney@...ium.com>

Because not all 256 CP0 registers are ever implemented, we need a
different method of manipulating them.  Use the
KVM_GET_MSRS/KVM_SET_MSRS mechanism as x86 does for its MSRs.

Code related to implementing KVM_GET_MSRS/KVM_SET_MSRS is consolidated
in to kvm_trap_emul.c, now unused code and definitions are removed.

Signed-off-by: David Daney <david.daney@...ium.com>
---
 arch/mips/include/asm/kvm.h      |  69 ++++++--
 arch/mips/include/asm/kvm_host.h |   4 -
 arch/mips/kvm/kvm_mips.c         |  92 +----------
 arch/mips/kvm/kvm_trap_emul.c    | 330 ++++++++++++++++++++++++++++++++++-----
 4 files changed, 350 insertions(+), 145 deletions(-)

diff --git a/arch/mips/include/asm/kvm.h b/arch/mips/include/asm/kvm.h
index d145ead..cae080c 100644
--- a/arch/mips/include/asm/kvm.h
+++ b/arch/mips/include/asm/kvm.h
@@ -13,10 +13,11 @@
 
 #include <linux/types.h>
 
-#define __KVM_MIPS
-
-#define N_MIPS_COPROC_REGS      32
-#define N_MIPS_COPROC_SEL   	8
+/*
+ * KVM MIPS specific structures and definitions.
+ *
+ * Some parts derived from the x86 version of this file.
+ */
 
 /*
  * for KVM_GET_REGS and KVM_SET_REGS
@@ -31,12 +32,6 @@ struct kvm_regs {
 	__u64 hi;
 	__u64 lo;
 	__u64 pc;
-
-	__u32 cp0reg[N_MIPS_COPROC_REGS][N_MIPS_COPROC_SEL];
-};
-
-/* for KVM_GET_SREGS and KVM_SET_SREGS */
-struct kvm_sregs {
 };
 
 /*
@@ -55,21 +50,67 @@ struct kvm_fpu {
 	__u32 pad;
 };
 
+
+/*
+ * For MIPS, we use the same APIs as x86, where 'msr' corresponds to a
+ * CP0 register.  The index field is broken down as follows:
+ *
+ *  bits[2..0]   - Register 'sel' index.
+ *  bits[7..3]   - Register 'rd'  index.
+ *  bits[15..8]  - Must be zero.
+ *  bits[31..16] - 0 -> CP0 registers.
+ *
+ * Other sets registers may be added in the future.  Each set would
+ * have its own identifier in bits[31..16].
+ *
+ * For MSRs that are narrower than 64-bits, the value is stored in the
+ * low order bits of the data field, and sign extended to 64-bits.
+ */
+#define KVM_MIPS_MSR_CP0 0
+struct kvm_msr_entry {
+	__u32 index;
+	__u32 reserved;
+	__u64 data;
+};
+
+/* for KVM_GET_MSRS and KVM_SET_MSRS */
+struct kvm_msrs {
+	__u32 nmsrs; /* number of msrs in entries */
+	__u32 pad;
+
+	struct kvm_msr_entry entries[0];
+};
+
+/* for KVM_GET_MSR_INDEX_LIST */
+struct kvm_msr_list {
+	__u32 nmsrs; /* number of msrs in entries */
+	__u32 indices[0];
+};
+
+/*
+ * KVM MIPS specific structures and definitions
+ *
+ */
 struct kvm_debug_exit_arch {
+	__u64 epc;
 };
 
 /* for KVM_SET_GUEST_DEBUG */
 struct kvm_guest_debug_arch {
 };
 
+/* definition of registers in kvm_run */
+struct kvm_sync_regs {
+};
+
+/* dummy definition */
+struct kvm_sregs {
+};
+
 struct kvm_mips_interrupt {
 	/* in */
 	__u32 cpu;
 	__u32 irq;
 };
 
-/* definition of registers in kvm_run */
-struct kvm_sync_regs {
-};
-
 #endif /* __LINUX_KVM_MIPS_H */
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index 143875c..4d6fa0b 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -496,10 +496,6 @@ struct kvm_mips_callbacks {
 			    uint32_t cause);
 	int (*irq_clear) (struct kvm_vcpu *vcpu, unsigned int priority,
 			  uint32_t cause);
-	int (*vcpu_ioctl_get_regs) (struct kvm_vcpu *vcpu,
-				    struct kvm_regs *regs);
-	int (*vcpu_ioctl_set_regs) (struct kvm_vcpu *vcpu,
-				    struct kvm_regs *regs);
 };
 extern struct kvm_mips_callbacks *kvm_mips_callbacks;
 int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks);
diff --git a/arch/mips/kvm/kvm_mips.c b/arch/mips/kvm/kvm_mips.c
index 71a1fc1..26a40e3 100644
--- a/arch/mips/kvm/kvm_mips.c
+++ b/arch/mips/kvm/kvm_mips.c
@@ -51,16 +51,6 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
 	{NULL}
 };
 
-static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu)
-{
-	int i;
-	for_each_possible_cpu(i) {
-		vcpu->arch.guest_kernel_asid[i] = 0;
-		vcpu->arch.guest_user_asid[i] = 0;
-	}
-	return 0;
-}
-
 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
 {
 	return gfn;
@@ -192,12 +182,6 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
 	}
 }
 
-long
-kvm_arch_dev_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
-{
-	return -EINVAL;
-}
-
 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
 			   struct kvm_memory_slot *dont)
 {
@@ -435,42 +419,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 
 	return r;
 }
-
-int
-kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq)
-{
-	int intr = (int)irq->irq;
-	struct kvm_vcpu *dvcpu = NULL;
-
-	if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
-		kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
-			  (int)intr);
-
-	if (irq->cpu == -1)
-		dvcpu = vcpu;
-	else
-		dvcpu = vcpu->kvm->vcpus[irq->cpu];
-
-	if (intr == 2 || intr == 3 || intr == 4) {
-		kvm_mips_callbacks->queue_io_int(dvcpu, irq);
-
-	} else if (intr == -2 || intr == -3 || intr == -4) {
-		kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
-	} else {
-		kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
-			irq->cpu, irq->irq);
-		return -EINVAL;
-	}
-
-	dvcpu->arch.wait = 0;
-
-	if (waitqueue_active(&dvcpu->wq)) {
-		wake_up_interruptible(&dvcpu->wq);
-	}
-
-	return 0;
-}
-
 int
 kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
 				struct kvm_mp_state *mp_state)
@@ -485,42 +433,6 @@ kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
 	return -EINVAL;
 }
 
-long
-kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
-{
-	struct kvm_vcpu *vcpu = filp->private_data;
-	void __user *argp = (void __user *)arg;
-	long r;
-	int intr;
-
-	switch (ioctl) {
-	case KVM_NMI:
-		/* Treat the NMI as a CPU reset */
-		r = kvm_mips_reset_vcpu(vcpu);
-		break;
-	case KVM_INTERRUPT:
-		{
-			struct kvm_mips_interrupt irq;
-			r = -EFAULT;
-			if (copy_from_user(&irq, argp, sizeof(irq)))
-				goto out;
-
-			intr = (int)irq.irq;
-
-			kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
-				  irq.irq);
-
-			r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
-			break;
-		}
-	default:
-		r = -EINVAL;
-	}
-
-out:
-	return r;
-}
-
 /*
  * Get (and clear) the dirty memory log for a memory slot.
  */
@@ -684,7 +596,7 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 	vcpu->arch.lo = regs->lo;
 	vcpu->arch.pc = regs->pc;
 
-	return kvm_mips_callbacks->vcpu_ioctl_set_regs(vcpu, regs);
+	return 0;
 }
 
 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
@@ -698,7 +610,7 @@ int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 	regs->lo = vcpu->arch.lo;
 	regs->pc = vcpu->arch.pc;
 
-	return kvm_mips_callbacks->vcpu_ioctl_get_regs(vcpu, regs);
+	return 0;
 }
 
 void kvm_mips_comparecount_func(unsigned long data)
diff --git a/arch/mips/kvm/kvm_trap_emul.c b/arch/mips/kvm/kvm_trap_emul.c
index 466aeef..df98dcb 100644
--- a/arch/mips/kvm/kvm_trap_emul.c
+++ b/arch/mips/kvm/kvm_trap_emul.c
@@ -13,7 +13,7 @@
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/vmalloc.h>
-
+#include <linux/fs.h>
 #include <linux/kvm_host.h>
 
 #include "kvm_mips_opcode.h"
@@ -345,54 +345,312 @@ static int kvm_trap_emul_handle_break(struct kvm_vcpu *vcpu)
 	return ret;
 }
 
-static int
-kvm_trap_emul_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
+#define MSR_MIPS_CP0_INDEX (8 * 0 + 0)
+#define MSR_MIPS_CP0_ENTRYLO0 (8 * 2 + 0)
+#define MSR_MIPS_CP0_ENTRYLO1 (8 * 3 + 0)
+#define MSR_MIPS_CP0_CONTEXT (8 * 4 + 0)
+#define MSR_MIPS_CP0_USERLOCAL (8 * 4 + 2)
+#define MSR_MIPS_CP0_PAGEMASK (8 * 5 + 0)
+#define MSR_MIPS_CP0_PAGEGRAIN (8 * 5 + 1)
+#define MSR_MIPS_CP0_WIRED (8 * 6 + 0)
+#define MSR_MIPS_CP0_HWRENA (8 * 7 + 0)
+#define MSR_MIPS_CP0_BADVADDR (8 * 8 + 0)
+#define MSR_MIPS_CP0_COUNT (8 * 9 + 0)
+#define MSR_MIPS_CP0_ENTRYHI (8 * 10 + 0)
+#define MSR_MIPS_CP0_COMPARE (8 * 11 + 0)
+#define MSR_MIPS_CP0_STATUS (8 * 12 + 0)
+#define MSR_MIPS_CP0_CAUSE (8 * 13 + 0)
+#define MSR_MIPS_CP0_EBASE (8 * 15 + 1)
+#define MSR_MIPS_CP0_CONFIG (8 * 16 + 0)
+#define MSR_MIPS_CP0_CONFIG1 (8 * 16 + 1)
+#define MSR_MIPS_CP0_CONFIG2 (8 * 16 + 2)
+#define MSR_MIPS_CP0_CONFIG3 (8 * 16 + 3)
+#define MSR_MIPS_CP0_CONFIG7 (8 * 16 + 7)
+#define MSR_MIPS_CP0_XCONTEXT (8 * 20 + 0)
+#define MSR_MIPS_CP0_ERROREPC (8 * 30 + 0)
+
+static u32 msrs_to_save[] = {
+	MSR_MIPS_CP0_INDEX,
+	MSR_MIPS_CP0_CONTEXT,
+	MSR_MIPS_CP0_PAGEMASK,
+	MSR_MIPS_CP0_WIRED,
+	MSR_MIPS_CP0_BADVADDR,
+	MSR_MIPS_CP0_ENTRYHI,
+	MSR_MIPS_CP0_STATUS,
+	MSR_MIPS_CP0_CAUSE,
+	/* EPC set via kvm_regs, et al. */
+	MSR_MIPS_CP0_CONFIG,
+	MSR_MIPS_CP0_CONFIG1,
+	MSR_MIPS_CP0_CONFIG2,
+	MSR_MIPS_CP0_CONFIG3,
+	MSR_MIPS_CP0_CONFIG7,
+	MSR_MIPS_CP0_XCONTEXT,
+	MSR_MIPS_CP0_ERROREPC
+};
+
+#define MAX_IO_MSRS 128
+
+static int mipsvz_get_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
 {
 	struct mips_coproc *cop0 = vcpu->arch.cop0;
+	s64 v;
 
-	kvm_write_c0_guest_index(cop0, regs->cp0reg[MIPS_CP0_TLB_INDEX][0]);
-	kvm_write_c0_guest_context(cop0, regs->cp0reg[MIPS_CP0_TLB_CONTEXT][0]);
-	kvm_write_c0_guest_badvaddr(cop0, regs->cp0reg[MIPS_CP0_BAD_VADDR][0]);
-	kvm_write_c0_guest_entryhi(cop0, regs->cp0reg[MIPS_CP0_TLB_HI][0]);
-	kvm_write_c0_guest_epc(cop0, regs->cp0reg[MIPS_CP0_EXC_PC][0]);
+	switch (index) {
+	case MSR_MIPS_CP0_INDEX:
+		v = (long)kvm_read_c0_guest_index(cop0);
+		break;
+	case MSR_MIPS_CP0_CONTEXT:
+		v = (long)kvm_read_c0_guest_context(cop0);
+		break;
+	case MSR_MIPS_CP0_PAGEMASK:
+		v = (long)kvm_read_c0_guest_pagemask(cop0);
+		break;
+	case MSR_MIPS_CP0_WIRED:
+		v = (long)kvm_read_c0_guest_wired(cop0);
+		break;
+	case MSR_MIPS_CP0_BADVADDR:
+		v = (long)kvm_read_c0_guest_badvaddr(cop0);
+		break;
+	case MSR_MIPS_CP0_ENTRYHI:
+		v = (long)kvm_read_c0_guest_entryhi(cop0);
+		break;
+	case MSR_MIPS_CP0_STATUS:
+		v = (long)kvm_read_c0_guest_status(cop0);
+		break;
+	case MSR_MIPS_CP0_CAUSE:
+		v = (long)kvm_read_c0_guest_cause(cop0);
+		break;
+	case MSR_MIPS_CP0_ERROREPC:
+		v = (long)kvm_read_c0_guest_errorepc(cop0);
+		break;
+	case MSR_MIPS_CP0_CONFIG:
+		v = (long)kvm_read_c0_guest_config(cop0);
+		break;
+	case MSR_MIPS_CP0_CONFIG1:
+		v = (long)kvm_read_c0_guest_config1(cop0);
+		break;
+	case MSR_MIPS_CP0_CONFIG2:
+		v = (long)kvm_read_c0_guest_config2(cop0);
+		break;
+	case MSR_MIPS_CP0_CONFIG3:
+		v = (long)kvm_read_c0_guest_config3(cop0);
+		break;
+	case MSR_MIPS_CP0_CONFIG7:
+		v = (long)kvm_read_c0_guest_config7(cop0);
+		break;
+	default:
+		return -EINVAL;
+	}
+	*data = v;
+	return 0;
+}
 
-	kvm_write_c0_guest_status(cop0, regs->cp0reg[MIPS_CP0_STATUS][0]);
-	kvm_write_c0_guest_cause(cop0, regs->cp0reg[MIPS_CP0_CAUSE][0]);
-	kvm_write_c0_guest_pagemask(cop0,
-				    regs->cp0reg[MIPS_CP0_TLB_PG_MASK][0]);
-	kvm_write_c0_guest_wired(cop0, regs->cp0reg[MIPS_CP0_TLB_WIRED][0]);
-	kvm_write_c0_guest_errorepc(cop0, regs->cp0reg[MIPS_CP0_ERROR_PC][0]);
+static int mipsvz_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
+{
+	struct mips_coproc *cop0 = vcpu->arch.cop0;
+	u64 v = *data;
 
+	switch (index) {
+	case MSR_MIPS_CP0_INDEX:
+		kvm_write_c0_guest_index(cop0, v);
+		break;
+	case MSR_MIPS_CP0_CONTEXT:
+		kvm_write_c0_guest_context(cop0, v);
+		break;
+	case MSR_MIPS_CP0_PAGEMASK:
+		kvm_write_c0_guest_pagemask(cop0, v);
+		break;
+	case MSR_MIPS_CP0_WIRED:
+		kvm_write_c0_guest_wired(cop0, v);
+		break;
+	case MSR_MIPS_CP0_BADVADDR:
+		kvm_write_c0_guest_badvaddr(cop0, v);
+		break;
+	case MSR_MIPS_CP0_ENTRYHI:
+		kvm_write_c0_guest_entryhi(cop0, v);
+		break;
+	case MSR_MIPS_CP0_STATUS:
+		kvm_write_c0_guest_status(cop0, v);
+		break;
+	case MSR_MIPS_CP0_CAUSE:
+		kvm_write_c0_guest_cause(cop0, v);
+		break;
+	case MSR_MIPS_CP0_ERROREPC:
+		kvm_write_c0_guest_errorepc(cop0, v);
+		break;
+	default:
+		return -EINVAL;
+	}
 	return 0;
 }
 
-static int
-kvm_trap_emul_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
+/*
+ * Read or write a bunch of msrs. Parameters are user addresses.
+ *
+ * @return number of msrs set successfully.
+ */
+static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
+		  int (*do_msr)(struct kvm_vcpu *vcpu,
+				unsigned index, u64 *data),
+		  bool writeback)
 {
-	struct mips_coproc *cop0 = vcpu->arch.cop0;
+	struct kvm_msrs msrs;
+	struct kvm_msr_entry *entries;
+	int r, n;
+	unsigned size;
+
+	r = -EFAULT;
+	if (copy_from_user(&msrs, user_msrs, sizeof(msrs)))
+		goto out;
+
+	r = -E2BIG;
+	if (msrs.nmsrs >= MAX_IO_MSRS)
+		goto out;
+
+	size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
+	entries = memdup_user(user_msrs->entries, size);
+	if (IS_ERR(entries)) {
+		r = PTR_ERR(entries);
+		goto out;
+	}
 
-	regs->cp0reg[MIPS_CP0_TLB_INDEX][0] = kvm_read_c0_guest_index(cop0);
-	regs->cp0reg[MIPS_CP0_TLB_CONTEXT][0] = kvm_read_c0_guest_context(cop0);
-	regs->cp0reg[MIPS_CP0_BAD_VADDR][0] = kvm_read_c0_guest_badvaddr(cop0);
-	regs->cp0reg[MIPS_CP0_TLB_HI][0] = kvm_read_c0_guest_entryhi(cop0);
-	regs->cp0reg[MIPS_CP0_EXC_PC][0] = kvm_read_c0_guest_epc(cop0);
-
-	regs->cp0reg[MIPS_CP0_STATUS][0] = kvm_read_c0_guest_status(cop0);
-	regs->cp0reg[MIPS_CP0_CAUSE][0] = kvm_read_c0_guest_cause(cop0);
-	regs->cp0reg[MIPS_CP0_TLB_PG_MASK][0] =
-	    kvm_read_c0_guest_pagemask(cop0);
-	regs->cp0reg[MIPS_CP0_TLB_WIRED][0] = kvm_read_c0_guest_wired(cop0);
-	regs->cp0reg[MIPS_CP0_ERROR_PC][0] = kvm_read_c0_guest_errorepc(cop0);
-
-	regs->cp0reg[MIPS_CP0_CONFIG][0] = kvm_read_c0_guest_config(cop0);
-	regs->cp0reg[MIPS_CP0_CONFIG][1] = kvm_read_c0_guest_config1(cop0);
-	regs->cp0reg[MIPS_CP0_CONFIG][2] = kvm_read_c0_guest_config2(cop0);
-	regs->cp0reg[MIPS_CP0_CONFIG][3] = kvm_read_c0_guest_config3(cop0);
-	regs->cp0reg[MIPS_CP0_CONFIG][7] = kvm_read_c0_guest_config7(cop0);
+	for (n = 0; n < msrs.nmsrs; ++n)
+		if (do_msr(vcpu, entries[n].index, &entries[n].data))
+			break;
+
+	r = -EFAULT;
+	if (writeback && copy_to_user(user_msrs->entries, entries, size))
+		goto out_free;
+
+	r = n;
+
+out_free:
+	kfree(entries);
+out:
+	return r;
+}
+
+static int kvm_mips_reset_vcpu(struct kvm_vcpu *vcpu)
+{
+	int i;
+	for_each_possible_cpu(i) {
+		vcpu->arch.guest_kernel_asid[i] = 0;
+		vcpu->arch.guest_user_asid[i] = 0;
+	}
+	return 0;
+}
+
+int
+kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_mips_interrupt *irq)
+{
+	int intr = (int)irq->irq;
+	struct kvm_vcpu *dvcpu = NULL;
+
+	if (intr == 3 || intr == -3 || intr == 4 || intr == -4)
+		kvm_debug("%s: CPU: %d, INTR: %d\n", __func__, irq->cpu,
+			  (int)intr);
+
+	if (irq->cpu == -1)
+		dvcpu = vcpu;
+	else
+		dvcpu = vcpu->kvm->vcpus[irq->cpu];
+
+	if (intr == 2 || intr == 3 || intr == 4) {
+		kvm_mips_callbacks->queue_io_int(dvcpu, irq);
+
+	} else if (intr == -2 || intr == -3 || intr == -4) {
+		kvm_mips_callbacks->dequeue_io_int(dvcpu, irq);
+	} else {
+		kvm_err("%s: invalid interrupt ioctl (%d:%d)\n", __func__,
+			irq->cpu, irq->irq);
+		return -EINVAL;
+	}
+
+	dvcpu->arch.wait = 0;
+
+	if (waitqueue_active(&dvcpu->wq))
+		wake_up_interruptible(&dvcpu->wq);
 
 	return 0;
 }
 
+long
+kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
+{
+	struct kvm_vcpu *vcpu = filp->private_data;
+	void __user *argp = (void __user *)arg;
+	long r;
+
+	switch (ioctl) {
+	case KVM_GET_MSRS:
+		r = msr_io(vcpu, argp, mipsvz_get_msr, true);
+		break;
+	case KVM_SET_MSRS:
+		r = msr_io(vcpu, argp, mipsvz_set_msr, false);
+		break;
+	case KVM_NMI:
+		/* Treat the NMI as a CPU reset */
+		r = kvm_mips_reset_vcpu(vcpu);
+		break;
+	case KVM_INTERRUPT:
+		{
+			struct kvm_mips_interrupt irq;
+			r = -EFAULT;
+			if (copy_from_user(&irq, argp, sizeof(irq)))
+				goto out;
+
+			kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__,
+				  irq.irq);
+
+			r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
+			break;
+		}
+	default:
+		r = -ENOIOCTLCMD;
+	}
+
+out:
+	return r;
+}
+
+long kvm_arch_dev_ioctl(struct file *filp,
+			unsigned int ioctl, unsigned long arg)
+{
+	long r;
+	void __user *argp = (void __user *)arg;
+
+	switch (ioctl) {
+	case KVM_GET_MSR_INDEX_LIST: {
+		struct kvm_msr_list __user *user_msr_list = argp;
+		struct kvm_msr_list msr_list;
+		unsigned n;
+		unsigned num_msrs_to_save;
+
+		r = -EFAULT;
+		if (copy_from_user(&msr_list, user_msr_list, sizeof(msr_list)))
+			goto out;
+		n = msr_list.nmsrs;
+		msr_list.nmsrs = ARRAY_SIZE(msrs_to_save);
+		num_msrs_to_save = min(n, msr_list.nmsrs);
+		if (copy_to_user(user_msr_list, &msr_list, sizeof(msr_list)))
+			goto out;
+		r = -E2BIG;
+		if (n < msr_list.nmsrs)
+			goto out;
+		r = -EFAULT;
+		if (copy_to_user(user_msr_list->indices, &msrs_to_save,
+				 num_msrs_to_save * sizeof(u32)))
+			goto out;
+		r = 0;
+		break;
+	}
+	default:
+		r = -ENOIOCTLCMD;
+	}
+out:
+	return r;
+}
+
 static int kvm_trap_emul_vm_init(struct kvm *kvm)
 {
 	return 0;
@@ -471,8 +729,6 @@ static struct kvm_mips_callbacks kvm_trap_emul_callbacks = {
 	.dequeue_io_int = kvm_mips_dequeue_io_int_cb,
 	.irq_deliver = kvm_mips_irq_deliver_cb,
 	.irq_clear = kvm_mips_irq_clear_cb,
-	.vcpu_ioctl_get_regs = kvm_trap_emul_ioctl_get_regs,
-	.vcpu_ioctl_set_regs = kvm_trap_emul_ioctl_set_regs,
 };
 
 int kvm_mips_emulation_init(struct kvm_mips_callbacks **install_callbacks)
-- 
1.7.11.7

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