RFC/patch 1/3 portability: move kvm_get/set_msr[_common] to x86.c

RFC/patch 1/3 portability: move kvm_get/set_msr[_common] to x86.c

[Carsten Otte]

This patch moves the implementation of the functions of kvm_get/set_msr,
kvm_get/set_msr_common, and set_efer from kvm_main.c to x86.c. The
definition of EFER_RESERVED_BITS is moved too.

Signed-off-by: Carsten Otte <cotte-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
--- 
kvm_main.c |  133 ------------------------------------------------------------
 x86.c      |  134 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 134 insertions(+), 133 deletions(-)
Index: kvm/drivers/kvm/kvm_main.c
===================================================================
--- kvm.orig/drivers/kvm/kvm_main.c	2007-10-30 11:28:41.000000000 +0100
+++ kvm/drivers/kvm/kvm_main.c	2007-10-30 14:30:34.000000000 +0100
@@ -90,8 +90,6 @@
 
 static struct dentry *debugfs_dir;
 
-#define EFER_RESERVED_BITS 0xfffffffffffff2fe
-
 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
 			   unsigned long arg);
 
@@ -1347,137 +1345,6 @@
 	}
 }
 
-int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
-{
-	u64 data;
-
-	switch (msr) {
-	case 0xc0010010: /* SYSCFG */
-	case 0xc0010015: /* HWCR */
-	case MSR_IA32_PLATFORM_ID:
-	case MSR_IA32_P5_MC_ADDR:
-	case MSR_IA32_P5_MC_TYPE:
-	case MSR_IA32_MC0_CTL:
-	case MSR_IA32_MCG_STATUS:
-	case MSR_IA32_MCG_CAP:
-	case MSR_IA32_MC0_MISC:
-	case MSR_IA32_MC0_MISC+4:
-	case MSR_IA32_MC0_MISC+8:
-	case MSR_IA32_MC0_MISC+12:
-	case MSR_IA32_MC0_MISC+16:
-	case MSR_IA32_UCODE_REV:
-	case MSR_IA32_PERF_STATUS:
-	case MSR_IA32_EBL_CR_POWERON:
-		/* MTRR registers */
-	case 0xfe:
-	case 0x200 ... 0x2ff:
-		data = 0;
-		break;
-	case 0xcd: /* fsb frequency */
-		data = 3;
-		break;
-	case MSR_IA32_APICBASE:
-		data = kvm_get_apic_base(vcpu);
-		break;
-	case MSR_IA32_MISC_ENABLE:
-		data = vcpu->ia32_misc_enable_msr;
-		break;
-#ifdef CONFIG_X86_64
-	case MSR_EFER:
-		data = vcpu->shadow_efer;
-		break;
-#endif
-	default:
-		pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
-		return 1;
-	}
-	*pdata = data;
-	return 0;
-}
-EXPORT_SYMBOL_GPL(kvm_get_msr_common);
-
-/*
- * Reads an msr value (of 'msr_index') into 'pdata'.
- * Returns 0 on success, non-0 otherwise.
- * Assumes vcpu_load() was already called.
- */
-int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
-{
-	return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
-}
-
-#ifdef CONFIG_X86_64
-
-static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
-{
-	if (efer & EFER_RESERVED_BITS) {
-		printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
-		       efer);
-		inject_gp(vcpu);
-		return;
-	}
-
-	if (is_paging(vcpu)
-	    && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
-		printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
-		inject_gp(vcpu);
-		return;
-	}
-
-	kvm_x86_ops->set_efer(vcpu, efer);
-
-	efer &= ~EFER_LMA;
-	efer |= vcpu->shadow_efer & EFER_LMA;
-
-	vcpu->shadow_efer = efer;
-}
-
-#endif
-
-int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
-{
-	switch (msr) {
-#ifdef CONFIG_X86_64
-	case MSR_EFER:
-		set_efer(vcpu, data);
-		break;
-#endif
-	case MSR_IA32_MC0_STATUS:
-		pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
-		       __FUNCTION__, data);
-		break;
-	case MSR_IA32_MCG_STATUS:
-		pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
-			__FUNCTION__, data);
-		break;
-	case MSR_IA32_UCODE_REV:
-	case MSR_IA32_UCODE_WRITE:
-	case 0x200 ... 0x2ff: /* MTRRs */
-		break;
-	case MSR_IA32_APICBASE:
-		kvm_set_apic_base(vcpu, data);
-		break;
-	case MSR_IA32_MISC_ENABLE:
-		vcpu->ia32_misc_enable_msr = data;
-		break;
-	default:
-		pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr);
-		return 1;
-	}
-	return 0;
-}
-EXPORT_SYMBOL_GPL(kvm_set_msr_common);
-
-/*
- * Writes msr value into into the appropriate "register".
- * Returns 0 on success, non-0 otherwise.
- * Assumes vcpu_load() was already called.
- */
-int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
-{
-	return kvm_x86_ops->set_msr(vcpu, msr_index, data);
-}
-
 void kvm_resched(struct kvm_vcpu *vcpu)
 {
 	if (!need_resched())
Index: kvm/drivers/kvm/x86.c
===================================================================
--- kvm.orig/drivers/kvm/x86.c	2007-10-30 11:28:41.000000000 +0100
+++ kvm/drivers/kvm/x86.c	2007-10-30 14:30:34.000000000 +0100
@@ -38,6 +38,7 @@
 			  | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
 
 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
+#define EFER_RESERVED_BITS 0xfffffffffffff2fe
 
 unsigned long segment_base(u16 selector)
 {
@@ -324,6 +325,44 @@
 	MSR_IA32_MISC_ENABLE,
 };
 
+#ifdef CONFIG_X86_64
+
+static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
+{
+	if (efer & EFER_RESERVED_BITS) {
+		printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
+		       efer);
+		inject_gp(vcpu);
+		return;
+	}
+
+	if (is_paging(vcpu)
+	    && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
+		printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
+		inject_gp(vcpu);
+		return;
+	}
+
+	kvm_x86_ops->set_efer(vcpu, efer);
+
+	efer &= ~EFER_LMA;
+	efer |= vcpu->shadow_efer & EFER_LMA;
+
+	vcpu->shadow_efer = efer;
+}
+
+#endif
+
+/*
+ * Writes msr value into into the appropriate "register".
+ * Returns 0 on success, non-0 otherwise.
+ * Assumes vcpu_load() was already called.
+ */
+int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
+{
+	return kvm_x86_ops->set_msr(vcpu, msr_index, data);
+}
+
 /*
  * Adapt set_msr() to msr_io()'s calling convention
  */
@@ -332,6 +371,101 @@
 	return kvm_set_msr(vcpu, index, *data);
 }
 
+
+int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
+{
+	switch (msr) {
+#ifdef CONFIG_X86_64
+	case MSR_EFER:
+		set_efer(vcpu, data);
+		break;
+#endif
+	case MSR_IA32_MC0_STATUS:
+		pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
+		       __FUNCTION__, data);
+		break;
+	case MSR_IA32_MCG_STATUS:
+		pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
+			__FUNCTION__, data);
+		break;
+	case MSR_IA32_UCODE_REV:
+	case MSR_IA32_UCODE_WRITE:
+	case 0x200 ... 0x2ff: /* MTRRs */
+		break;
+	case MSR_IA32_APICBASE:
+		kvm_set_apic_base(vcpu, data);
+		break;
+	case MSR_IA32_MISC_ENABLE:
+		vcpu->ia32_misc_enable_msr = data;
+		break;
+	default:
+		pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr);
+		return 1;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_set_msr_common);
+
+
+/*
+ * Reads an msr value (of 'msr_index') into 'pdata'.
+ * Returns 0 on success, non-0 otherwise.
+ * Assumes vcpu_load() was already called.
+ */
+int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
+{
+	return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
+}
+
+int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
+{
+	u64 data;
+
+	switch (msr) {
+	case 0xc0010010: /* SYSCFG */
+	case 0xc0010015: /* HWCR */
+	case MSR_IA32_PLATFORM_ID:
+	case MSR_IA32_P5_MC_ADDR:
+	case MSR_IA32_P5_MC_TYPE:
+	case MSR_IA32_MC0_CTL:
+	case MSR_IA32_MCG_STATUS:
+	case MSR_IA32_MCG_CAP:
+	case MSR_IA32_MC0_MISC:
+	case MSR_IA32_MC0_MISC+4:
+	case MSR_IA32_MC0_MISC+8:
+	case MSR_IA32_MC0_MISC+12:
+	case MSR_IA32_MC0_MISC+16:
+	case MSR_IA32_UCODE_REV:
+	case MSR_IA32_PERF_STATUS:
+	case MSR_IA32_EBL_CR_POWERON:
+		/* MTRR registers */
+	case 0xfe:
+	case 0x200 ... 0x2ff:
+		data = 0;
+		break;
+	case 0xcd: /* fsb frequency */
+		data = 3;
+		break;
+	case MSR_IA32_APICBASE:
+		data = kvm_get_apic_base(vcpu);
+		break;
+	case MSR_IA32_MISC_ENABLE:
+		data = vcpu->ia32_misc_enable_msr;
+		break;
+#ifdef CONFIG_X86_64
+	case MSR_EFER:
+		data = vcpu->shadow_efer;
+		break;
+#endif
+	default:
+		pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
+		return 1;
+	}
+	*pdata = data;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_get_msr_common);
+
 /*
  * Read or write a bunch of msrs. All parameters are kernel addresses.
  *



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RFC/patch 2/3 portability: move x86 emulation and mmio device hook to x86.c

[Carsten Otte]

This patch moves the following functions to from kvm_main.c to x86.c:
emulator_read/write_std, vcpu_find_pervcpu_dev, vcpu_find_mmio_dev,
emulator_read/write_emulated, emulator_write_phys,
emulator_write_emulated_onepage, emulator_cmpxchg_emulated,
get_setment_base, emulate_invlpg, emulate_clts, emulator_get/set_dr,
kvm_report_emulation_failure, emulate_instruction

The following data type is moved to x86.c:
struct x86_emulate_ops emulate_ops

Signed-off-by: Carsten Otte <cotte-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
--- 
kvm_main.c |  358 ------------------------------------------------------------
 x86.c      |  359 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 359 insertions(+), 358 deletions(-)
Index: kvm/drivers/kvm/kvm_main.c
===================================================================
--- kvm.orig/drivers/kvm/kvm_main.c	2007-10-30 18:06:24.000000000 +0100
+++ kvm/drivers/kvm/kvm_main.c	2007-10-30 18:27:56.000000000 +0100
@@ -817,370 +817,12 @@
 	}
 }
 
-int emulator_read_std(unsigned long addr,
-			     void *val,
-			     unsigned int bytes,
-			     struct kvm_vcpu *vcpu)
-{
-	void *data = val;
-
-	while (bytes) {
-		gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
-		unsigned offset = addr & (PAGE_SIZE-1);
-		unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
-		int ret;
-
-		if (gpa == UNMAPPED_GVA)
-			return X86EMUL_PROPAGATE_FAULT;
-		ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
-		if (ret < 0)
-			return X86EMUL_UNHANDLEABLE;
-
-		bytes -= tocopy;
-		data += tocopy;
-		addr += tocopy;
-	}
-
-	return X86EMUL_CONTINUE;
-}
-EXPORT_SYMBOL_GPL(emulator_read_std);
-
-static int emulator_write_std(unsigned long addr,
-			      const void *val,
-			      unsigned int bytes,
-			      struct kvm_vcpu *vcpu)
-{
-	pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes);
-	return X86EMUL_UNHANDLEABLE;
-}
-
-/*
- * Only apic need an MMIO device hook, so shortcut now..
- */
-static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
-						gpa_t addr)
-{
-	struct kvm_io_device *dev;
-
-	if (vcpu->apic) {
-		dev = &vcpu->apic->dev;
-		if (dev->in_range(dev, addr))
-			return dev;
-	}
-	return NULL;
-}
-
-static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
-						gpa_t addr)
-{
-	struct kvm_io_device *dev;
-
-	dev = vcpu_find_pervcpu_dev(vcpu, addr);
-	if (dev == NULL)
-		dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
-	return dev;
-}
-
 static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
 					       gpa_t addr)
 {
 	return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
 }
 
-static int emulator_read_emulated(unsigned long addr,
-				  void *val,
-				  unsigned int bytes,
-				  struct kvm_vcpu *vcpu)
-{
-	struct kvm_io_device *mmio_dev;
-	gpa_t                 gpa;
-
-	if (vcpu->mmio_read_completed) {
-		memcpy(val, vcpu->mmio_data, bytes);
-		vcpu->mmio_read_completed = 0;
-		return X86EMUL_CONTINUE;
-	}
-
-	gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
-
-	/* For APIC access vmexit */
-	if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
-		goto mmio;
-
-	if (emulator_read_std(addr, val, bytes, vcpu)
-			== X86EMUL_CONTINUE)
-		return X86EMUL_CONTINUE;
-	if (gpa == UNMAPPED_GVA)
-		return X86EMUL_PROPAGATE_FAULT;
-
-mmio:
-	/*
-	 * Is this MMIO handled locally?
-	 */
-	mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
-	if (mmio_dev) {
-		kvm_iodevice_read(mmio_dev, gpa, bytes, val);
-		return X86EMUL_CONTINUE;
-	}
-
-	vcpu->mmio_needed = 1;
-	vcpu->mmio_phys_addr = gpa;
-	vcpu->mmio_size = bytes;
-	vcpu->mmio_is_write = 0;
-
-	return X86EMUL_UNHANDLEABLE;
-}
-
-static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
-			       const void *val, int bytes)
-{
-	int ret;
-
-	ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
-	if (ret < 0)
-		return 0;
-	kvm_mmu_pte_write(vcpu, gpa, val, bytes);
-	return 1;
-}
-
-static int emulator_write_emulated_onepage(unsigned long addr,
-					   const void *val,
-					   unsigned int bytes,
-					   struct kvm_vcpu *vcpu)
-{
-	struct kvm_io_device *mmio_dev;
-	gpa_t                 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
-
-	if (gpa == UNMAPPED_GVA) {
-		kvm_x86_ops->inject_page_fault(vcpu, addr, 2);
-		return X86EMUL_PROPAGATE_FAULT;
-	}
-
-	/* For APIC access vmexit */
-	if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
-		goto mmio;
-
-	if (emulator_write_phys(vcpu, gpa, val, bytes))
-		return X86EMUL_CONTINUE;
-
-mmio:
-	/*
-	 * Is this MMIO handled locally?
-	 */
-	mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
-	if (mmio_dev) {
-		kvm_iodevice_write(mmio_dev, gpa, bytes, val);
-		return X86EMUL_CONTINUE;
-	}
-
-	vcpu->mmio_needed = 1;
-	vcpu->mmio_phys_addr = gpa;
-	vcpu->mmio_size = bytes;
-	vcpu->mmio_is_write = 1;
-	memcpy(vcpu->mmio_data, val, bytes);
-
-	return X86EMUL_CONTINUE;
-}
-
-int emulator_write_emulated(unsigned long addr,
-				   const void *val,
-				   unsigned int bytes,
-				   struct kvm_vcpu *vcpu)
-{
-	/* Crossing a page boundary? */
-	if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
-		int rc, now;
-
-		now = -addr & ~PAGE_MASK;
-		rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
-		if (rc != X86EMUL_CONTINUE)
-			return rc;
-		addr += now;
-		val += now;
-		bytes -= now;
-	}
-	return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
-}
-EXPORT_SYMBOL_GPL(emulator_write_emulated);
-
-static int emulator_cmpxchg_emulated(unsigned long addr,
-				     const void *old,
-				     const void *new,
-				     unsigned int bytes,
-				     struct kvm_vcpu *vcpu)
-{
-	static int reported;
-
-	if (!reported) {
-		reported = 1;
-		printk(KERN_WARNING "kvm: emulating exchange as write\n");
-	}
-	return emulator_write_emulated(addr, new, bytes, vcpu);
-}
-
-static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
-{
-	return kvm_x86_ops->get_segment_base(vcpu, seg);
-}
-
-int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
-{
-	return X86EMUL_CONTINUE;
-}
-
-int emulate_clts(struct kvm_vcpu *vcpu)
-{
-	vcpu->cr0 &= ~X86_CR0_TS;
-	kvm_x86_ops->set_cr0(vcpu, vcpu->cr0);
-	return X86EMUL_CONTINUE;
-}
-
-int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
-{
-	struct kvm_vcpu *vcpu = ctxt->vcpu;
-
-	switch (dr) {
-	case 0 ... 3:
-		*dest = kvm_x86_ops->get_dr(vcpu, dr);
-		return X86EMUL_CONTINUE;
-	default:
-		pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
-		return X86EMUL_UNHANDLEABLE;
-	}
-}
-
-int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
-{
-	unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
-	int exception;
-
-	kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
-	if (exception) {
-		/* FIXME: better handling */
-		return X86EMUL_UNHANDLEABLE;
-	}
-	return X86EMUL_CONTINUE;
-}
-
-void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
-{
-	static int reported;
-	u8 opcodes[4];
-	unsigned long rip = vcpu->rip;
-	unsigned long rip_linear;
-
-	rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
-
-	if (reported)
-		return;
-
-	emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
-
-	printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
-	       context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
-	reported = 1;
-}
-EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
-
-struct x86_emulate_ops emulate_ops = {
-	.read_std            = emulator_read_std,
-	.write_std           = emulator_write_std,
-	.read_emulated       = emulator_read_emulated,
-	.write_emulated      = emulator_write_emulated,
-	.cmpxchg_emulated    = emulator_cmpxchg_emulated,
-};
-
-int emulate_instruction(struct kvm_vcpu *vcpu,
-			struct kvm_run *run,
-			unsigned long cr2,
-			u16 error_code,
-			int no_decode)
-{
-	int r;
-
-	vcpu->mmio_fault_cr2 = cr2;
-	kvm_x86_ops->cache_regs(vcpu);
-
-	vcpu->mmio_is_write = 0;
-	vcpu->pio.string = 0;
-
-	if (!no_decode) {
-		int cs_db, cs_l;
-		kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
-
-		vcpu->emulate_ctxt.vcpu = vcpu;
-		vcpu->emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
-		vcpu->emulate_ctxt.cr2 = cr2;
-		vcpu->emulate_ctxt.mode =
-			(vcpu->emulate_ctxt.eflags & X86_EFLAGS_VM)
-			? X86EMUL_MODE_REAL : cs_l
-			? X86EMUL_MODE_PROT64 :	cs_db
-			? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
-
-		if (vcpu->emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
-			vcpu->emulate_ctxt.cs_base = 0;
-			vcpu->emulate_ctxt.ds_base = 0;
-			vcpu->emulate_ctxt.es_base = 0;
-			vcpu->emulate_ctxt.ss_base = 0;
-		} else {
-			vcpu->emulate_ctxt.cs_base =
-					get_segment_base(vcpu, VCPU_SREG_CS);
-			vcpu->emulate_ctxt.ds_base =
-					get_segment_base(vcpu, VCPU_SREG_DS);
-			vcpu->emulate_ctxt.es_base =
-					get_segment_base(vcpu, VCPU_SREG_ES);
-			vcpu->emulate_ctxt.ss_base =
-					get_segment_base(vcpu, VCPU_SREG_SS);
-		}
-
-		vcpu->emulate_ctxt.gs_base =
-					get_segment_base(vcpu, VCPU_SREG_GS);
-		vcpu->emulate_ctxt.fs_base =
-					get_segment_base(vcpu, VCPU_SREG_FS);
-
-		r = x86_decode_insn(&vcpu->emulate_ctxt, &emulate_ops);
-		if (r)  {
-			if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
-				return EMULATE_DONE;
-			return EMULATE_FAIL;
-		}
-	}
-
-	r = x86_emulate_insn(&vcpu->emulate_ctxt, &emulate_ops);
-
-	if (vcpu->pio.string)
-		return EMULATE_DO_MMIO;
-
-	if ((r || vcpu->mmio_is_write) && run) {
-		run->exit_reason = KVM_EXIT_MMIO;
-		run->mmio.phys_addr = vcpu->mmio_phys_addr;
-		memcpy(run->mmio.data, vcpu->mmio_data, 8);
-		run->mmio.len = vcpu->mmio_size;
-		run->mmio.is_write = vcpu->mmio_is_write;
-	}
-
-	if (r) {
-		if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
-			return EMULATE_DONE;
-		if (!vcpu->mmio_needed) {
-			kvm_report_emulation_failure(vcpu, "mmio");
-			return EMULATE_FAIL;
-		}
-		return EMULATE_DO_MMIO;
-	}
-
-	kvm_x86_ops->decache_regs(vcpu);
-	kvm_x86_ops->set_rflags(vcpu, vcpu->emulate_ctxt.eflags);
-
-	if (vcpu->mmio_is_write) {
-		vcpu->mmio_needed = 0;
-		return EMULATE_DO_MMIO;
-	}
-
-	return EMULATE_DONE;
-}
-EXPORT_SYMBOL_GPL(emulate_instruction);
-
 /*
  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
  */
Index: kvm/drivers/kvm/x86.c
===================================================================
--- kvm.orig/drivers/kvm/x86.c	2007-10-30 18:06:24.000000000 +0100
+++ kvm/drivers/kvm/x86.c	2007-10-30 18:07:32.000000000 +0100
@@ -983,6 +983,365 @@
 	num_msrs_to_save = j;
 }
 
+/*
+ * Only apic need an MMIO device hook, so shortcut now..
+ */
+static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
+						gpa_t addr)
+{
+	struct kvm_io_device *dev;
+
+	if (vcpu->apic) {
+		dev = &vcpu->apic->dev;
+		if (dev->in_range(dev, addr))
+			return dev;
+	}
+	return NULL;
+}
+
+
+static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
+						gpa_t addr)
+{
+	struct kvm_io_device *dev;
+
+	dev = vcpu_find_pervcpu_dev(vcpu, addr);
+	if (dev == NULL)
+		dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
+	return dev;
+}
+
+int emulator_read_std(unsigned long addr,
+			     void *val,
+			     unsigned int bytes,
+			     struct kvm_vcpu *vcpu)
+{
+	void *data = val;
+
+	while (bytes) {
+		gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
+		unsigned offset = addr & (PAGE_SIZE-1);
+		unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
+		int ret;
+
+		if (gpa == UNMAPPED_GVA)
+			return X86EMUL_PROPAGATE_FAULT;
+		ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
+		if (ret < 0)
+			return X86EMUL_UNHANDLEABLE;
+
+		bytes -= tocopy;
+		data += tocopy;
+		addr += tocopy;
+	}
+
+	return X86EMUL_CONTINUE;
+}
+EXPORT_SYMBOL_GPL(emulator_read_std);
+
+static int emulator_write_std(unsigned long addr,
+			      const void *val,
+			      unsigned int bytes,
+			      struct kvm_vcpu *vcpu)
+{
+	pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes);
+	return X86EMUL_UNHANDLEABLE;
+}
+
+static int emulator_read_emulated(unsigned long addr,
+				  void *val,
+				  unsigned int bytes,
+				  struct kvm_vcpu *vcpu)
+{
+	struct kvm_io_device *mmio_dev;
+	gpa_t                 gpa;
+
+	if (vcpu->mmio_read_completed) {
+		memcpy(val, vcpu->mmio_data, bytes);
+		vcpu->mmio_read_completed = 0;
+		return X86EMUL_CONTINUE;
+	}
+
+	gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
+
+	/* For APIC access vmexit */
+	if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
+		goto mmio;
+
+	if (emulator_read_std(addr, val, bytes, vcpu)
+			== X86EMUL_CONTINUE)
+		return X86EMUL_CONTINUE;
+	if (gpa == UNMAPPED_GVA)
+		return X86EMUL_PROPAGATE_FAULT;
+
+mmio:
+	/*
+	 * Is this MMIO handled locally?
+	 */
+	mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
+	if (mmio_dev) {
+		kvm_iodevice_read(mmio_dev, gpa, bytes, val);
+		return X86EMUL_CONTINUE;
+	}
+
+	vcpu->mmio_needed = 1;
+	vcpu->mmio_phys_addr = gpa;
+	vcpu->mmio_size = bytes;
+	vcpu->mmio_is_write = 0;
+
+	return X86EMUL_UNHANDLEABLE;
+}
+
+static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
+			       const void *val, int bytes)
+{
+	int ret;
+
+	ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
+	if (ret < 0)
+		return 0;
+	kvm_mmu_pte_write(vcpu, gpa, val, bytes);
+	return 1;
+}
+
+static int emulator_write_emulated_onepage(unsigned long addr,
+					   const void *val,
+					   unsigned int bytes,
+					   struct kvm_vcpu *vcpu)
+{
+	struct kvm_io_device *mmio_dev;
+	gpa_t                 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
+
+	if (gpa == UNMAPPED_GVA) {
+		kvm_x86_ops->inject_page_fault(vcpu, addr, 2);
+		return X86EMUL_PROPAGATE_FAULT;
+	}
+
+	/* For APIC access vmexit */
+	if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
+		goto mmio;
+
+	if (emulator_write_phys(vcpu, gpa, val, bytes))
+		return X86EMUL_CONTINUE;
+
+mmio:
+	/*
+	 * Is this MMIO handled locally?
+	 */
+	mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
+	if (mmio_dev) {
+		kvm_iodevice_write(mmio_dev, gpa, bytes, val);
+		return X86EMUL_CONTINUE;
+	}
+
+	vcpu->mmio_needed = 1;
+	vcpu->mmio_phys_addr = gpa;
+	vcpu->mmio_size = bytes;
+	vcpu->mmio_is_write = 1;
+	memcpy(vcpu->mmio_data, val, bytes);
+
+	return X86EMUL_CONTINUE;
+}
+
+int emulator_write_emulated(unsigned long addr,
+				   const void *val,
+				   unsigned int bytes,
+				   struct kvm_vcpu *vcpu)
+{
+	/* Crossing a page boundary? */
+	if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
+		int rc, now;
+
+		now = -addr & ~PAGE_MASK;
+		rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
+		if (rc != X86EMUL_CONTINUE)
+			return rc;
+		addr += now;
+		val += now;
+		bytes -= now;
+	}
+	return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
+}
+EXPORT_SYMBOL_GPL(emulator_write_emulated);
+
+static int emulator_cmpxchg_emulated(unsigned long addr,
+				     const void *old,
+				     const void *new,
+				     unsigned int bytes,
+				     struct kvm_vcpu *vcpu)
+{
+	static int reported;
+
+	if (!reported) {
+		reported = 1;
+		printk(KERN_WARNING "kvm: emulating exchange as write\n");
+	}
+	return emulator_write_emulated(addr, new, bytes, vcpu);
+}
+
+static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
+{
+	return kvm_x86_ops->get_segment_base(vcpu, seg);
+}
+
+int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
+{
+	return X86EMUL_CONTINUE;
+}
+
+int emulate_clts(struct kvm_vcpu *vcpu)
+{
+	vcpu->cr0 &= ~X86_CR0_TS;
+	kvm_x86_ops->set_cr0(vcpu, vcpu->cr0);
+	return X86EMUL_CONTINUE;
+}
+
+int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
+{
+	struct kvm_vcpu *vcpu = ctxt->vcpu;
+
+	switch (dr) {
+	case 0 ... 3:
+		*dest = kvm_x86_ops->get_dr(vcpu, dr);
+		return X86EMUL_CONTINUE;
+	default:
+		pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
+		return X86EMUL_UNHANDLEABLE;
+	}
+}
+
+int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
+{
+	unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
+	int exception;
+
+	kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
+	if (exception) {
+		/* FIXME: better handling */
+		return X86EMUL_UNHANDLEABLE;
+	}
+	return X86EMUL_CONTINUE;
+}
+
+void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
+{
+	static int reported;
+	u8 opcodes[4];
+	unsigned long rip = vcpu->rip;
+	unsigned long rip_linear;
+
+	rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
+
+	if (reported)
+		return;
+
+	emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
+
+	printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
+	       context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
+	reported = 1;
+}
+EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
+
+struct x86_emulate_ops emulate_ops = {
+	.read_std            = emulator_read_std,
+	.write_std           = emulator_write_std,
+	.read_emulated       = emulator_read_emulated,
+	.write_emulated      = emulator_write_emulated,
+	.cmpxchg_emulated    = emulator_cmpxchg_emulated,
+};
+
+int emulate_instruction(struct kvm_vcpu *vcpu,
+			struct kvm_run *run,
+			unsigned long cr2,
+			u16 error_code,
+			int no_decode)
+{
+	int r;
+
+	vcpu->mmio_fault_cr2 = cr2;
+	kvm_x86_ops->cache_regs(vcpu);
+
+	vcpu->mmio_is_write = 0;
+	vcpu->pio.string = 0;
+
+	if (!no_decode) {
+		int cs_db, cs_l;
+		kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
+
+		vcpu->emulate_ctxt.vcpu = vcpu;
+		vcpu->emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
+		vcpu->emulate_ctxt.cr2 = cr2;
+		vcpu->emulate_ctxt.mode =
+			(vcpu->emulate_ctxt.eflags & X86_EFLAGS_VM)
+			? X86EMUL_MODE_REAL : cs_l
+			? X86EMUL_MODE_PROT64 :	cs_db
+			? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
+
+		if (vcpu->emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
+			vcpu->emulate_ctxt.cs_base = 0;
+			vcpu->emulate_ctxt.ds_base = 0;
+			vcpu->emulate_ctxt.es_base = 0;
+			vcpu->emulate_ctxt.ss_base = 0;
+		} else {
+			vcpu->emulate_ctxt.cs_base =
+					get_segment_base(vcpu, VCPU_SREG_CS);
+			vcpu->emulate_ctxt.ds_base =
+					get_segment_base(vcpu, VCPU_SREG_DS);
+			vcpu->emulate_ctxt.es_base =
+					get_segment_base(vcpu, VCPU_SREG_ES);
+			vcpu->emulate_ctxt.ss_base =
+					get_segment_base(vcpu, VCPU_SREG_SS);
+		}
+
+		vcpu->emulate_ctxt.gs_base =
+					get_segment_base(vcpu, VCPU_SREG_GS);
+		vcpu->emulate_ctxt.fs_base =
+					get_segment_base(vcpu, VCPU_SREG_FS);
+
+		r = x86_decode_insn(&vcpu->emulate_ctxt, &emulate_ops);
+		if (r)  {
+			if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
+				return EMULATE_DONE;
+			return EMULATE_FAIL;
+		}
+	}
+
+	r = x86_emulate_insn(&vcpu->emulate_ctxt, &emulate_ops);
+
+	if (vcpu->pio.string)
+		return EMULATE_DO_MMIO;
+
+	if ((r || vcpu->mmio_is_write) && run) {
+		run->exit_reason = KVM_EXIT_MMIO;
+		run->mmio.phys_addr = vcpu->mmio_phys_addr;
+		memcpy(run->mmio.data, vcpu->mmio_data, 8);
+		run->mmio.len = vcpu->mmio_size;
+		run->mmio.is_write = vcpu->mmio_is_write;
+	}
+
+	if (r) {
+		if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
+			return EMULATE_DONE;
+		if (!vcpu->mmio_needed) {
+			kvm_report_emulation_failure(vcpu, "mmio");
+			return EMULATE_FAIL;
+		}
+		return EMULATE_DO_MMIO;
+	}
+
+	kvm_x86_ops->decache_regs(vcpu);
+	kvm_x86_ops->set_rflags(vcpu, vcpu->emulate_ctxt.eflags);
+
+	if (vcpu->mmio_is_write) {
+		vcpu->mmio_needed = 0;
+		return EMULATE_DO_MMIO;
+	}
+
+	return EMULATE_DONE;
+}
+EXPORT_SYMBOL_GPL(emulate_instruction);
+
 __init void kvm_arch_init(void)
 {
 	kvm_init_msr_list();



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RFC/patch 3/3 portability: move pio emulation functions to x86.c

[Carsten Otte]

This patch moves implementation of the following functions from
kvm_main.c to x86.c:
free_pio_guest_pages, vcpu_find_pio_dev, pio_copy_data, complete_pio,
kernel_pio, pio_string_write, kvm_emulate_pio, kvm_emulate_pio_string

The function inject_gp, which was duplicated by yesterday's patch
series, is removed from kvm_main.c now because it is not needed anymore.

Signed-off-by: Carsten Otte <cotte-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
--- 
kvm_main.c |  248 -------------------------------------------------------------
 x86.c      |  243 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 x86.h      |    1 
 3 files changed, 244 insertions(+), 248 deletions(-)
Signed-off-by: Carsten Otte <cotte-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
---
Index: kvm/drivers/kvm/kvm_main.c
===================================================================
--- kvm.orig/drivers/kvm/kvm_main.c	2007-10-30 18:27:56.000000000 +0100
+++ kvm/drivers/kvm/kvm_main.c	2007-10-30 18:30:48.000000000 +0100
@@ -271,17 +271,6 @@
 		kvm_free_physmem_slot(&kvm->memslots[i], NULL);
 }
 
-static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
-{
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i)
-		if (vcpu->pio.guest_pages[i]) {
-			kvm_release_page(vcpu->pio.guest_pages[i]);
-			vcpu->pio.guest_pages[i] = NULL;
-		}
-}
-
 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
 {
 	vcpu_load(vcpu);
@@ -330,11 +319,6 @@
 	return 0;
 }
 
-static void inject_gp(struct kvm_vcpu *vcpu)
-{
-	kvm_x86_ops->inject_gp(vcpu, 0);
-}
-
 void fx_init(struct kvm_vcpu *vcpu)
 {
 	unsigned after_mxcsr_mask;
@@ -817,12 +801,6 @@
 	}
 }
 
-static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
-					       gpa_t addr)
-{
-	return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
-}
-
 /*
  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
  */
@@ -1032,232 +1010,6 @@
 }
 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
 
-static int pio_copy_data(struct kvm_vcpu *vcpu)
-{
-	void *p = vcpu->pio_data;
-	void *q;
-	unsigned bytes;
-	int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
-
-	q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
-		 PAGE_KERNEL);
-	if (!q) {
-		free_pio_guest_pages(vcpu);
-		return -ENOMEM;
-	}
-	q += vcpu->pio.guest_page_offset;
-	bytes = vcpu->pio.size * vcpu->pio.cur_count;
-	if (vcpu->pio.in)
-		memcpy(q, p, bytes);
-	else
-		memcpy(p, q, bytes);
-	q -= vcpu->pio.guest_page_offset;
-	vunmap(q);
-	free_pio_guest_pages(vcpu);
-	return 0;
-}
-
-static int complete_pio(struct kvm_vcpu *vcpu)
-{
-	struct kvm_pio_request *io = &vcpu->pio;
-	long delta;
-	int r;
-
-	kvm_x86_ops->cache_regs(vcpu);
-
-	if (!io->string) {
-		if (io->in)
-			memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
-			       io->size);
-	} else {
-		if (io->in) {
-			r = pio_copy_data(vcpu);
-			if (r) {
-				kvm_x86_ops->cache_regs(vcpu);
-				return r;
-			}
-		}
-
-		delta = 1;
-		if (io->rep) {
-			delta *= io->cur_count;
-			/*
-			 * The size of the register should really depend on
-			 * current address size.
-			 */
-			vcpu->regs[VCPU_REGS_RCX] -= delta;
-		}
-		if (io->down)
-			delta = -delta;
-		delta *= io->size;
-		if (io->in)
-			vcpu->regs[VCPU_REGS_RDI] += delta;
-		else
-			vcpu->regs[VCPU_REGS_RSI] += delta;
-	}
-
-	kvm_x86_ops->decache_regs(vcpu);
-
-	io->count -= io->cur_count;
-	io->cur_count = 0;
-
-	return 0;
-}
-
-static void kernel_pio(struct kvm_io_device *pio_dev,
-		       struct kvm_vcpu *vcpu,
-		       void *pd)
-{
-	/* TODO: String I/O for in kernel device */
-
-	mutex_lock(&vcpu->kvm->lock);
-	if (vcpu->pio.in)
-		kvm_iodevice_read(pio_dev, vcpu->pio.port,
-				  vcpu->pio.size,
-				  pd);
-	else
-		kvm_iodevice_write(pio_dev, vcpu->pio.port,
-				   vcpu->pio.size,
-				   pd);
-	mutex_unlock(&vcpu->kvm->lock);
-}
-
-static void pio_string_write(struct kvm_io_device *pio_dev,
-			     struct kvm_vcpu *vcpu)
-{
-	struct kvm_pio_request *io = &vcpu->pio;
-	void *pd = vcpu->pio_data;
-	int i;
-
-	mutex_lock(&vcpu->kvm->lock);
-	for (i = 0; i < io->cur_count; i++) {
-		kvm_iodevice_write(pio_dev, io->port,
-				   io->size,
-				   pd);
-		pd += io->size;
-	}
-	mutex_unlock(&vcpu->kvm->lock);
-}
-
-int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
-		  int size, unsigned port)
-{
-	struct kvm_io_device *pio_dev;
-
-	vcpu->run->exit_reason = KVM_EXIT_IO;
-	vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
-	vcpu->run->io.size = vcpu->pio.size = size;
-	vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
-	vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = 1;
-	vcpu->run->io.port = vcpu->pio.port = port;
-	vcpu->pio.in = in;
-	vcpu->pio.string = 0;
-	vcpu->pio.down = 0;
-	vcpu->pio.guest_page_offset = 0;
-	vcpu->pio.rep = 0;
-
-	kvm_x86_ops->cache_regs(vcpu);
-	memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
-	kvm_x86_ops->decache_regs(vcpu);
-
-	kvm_x86_ops->skip_emulated_instruction(vcpu);
-
-	pio_dev = vcpu_find_pio_dev(vcpu, port);
-	if (pio_dev) {
-		kernel_pio(pio_dev, vcpu, vcpu->pio_data);
-		complete_pio(vcpu);
-		return 1;
-	}
-	return 0;
-}
-EXPORT_SYMBOL_GPL(kvm_emulate_pio);
-
-int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
-		  int size, unsigned long count, int down,
-		  gva_t address, int rep, unsigned port)
-{
-	unsigned now, in_page;
-	int i, ret = 0;
-	int nr_pages = 1;
-	struct page *page;
-	struct kvm_io_device *pio_dev;
-
-	vcpu->run->exit_reason = KVM_EXIT_IO;
-	vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
-	vcpu->run->io.size = vcpu->pio.size = size;
-	vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
-	vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = count;
-	vcpu->run->io.port = vcpu->pio.port = port;
-	vcpu->pio.in = in;
-	vcpu->pio.string = 1;
-	vcpu->pio.down = down;
-	vcpu->pio.guest_page_offset = offset_in_page(address);
-	vcpu->pio.rep = rep;
-
-	if (!count) {
-		kvm_x86_ops->skip_emulated_instruction(vcpu);
-		return 1;
-	}
-
-	if (!down)
-		in_page = PAGE_SIZE - offset_in_page(address);
-	else
-		in_page = offset_in_page(address) + size;
-	now = min(count, (unsigned long)in_page / size);
-	if (!now) {
-		/*
-		 * String I/O straddles page boundary.  Pin two guest pages
-		 * so that we satisfy atomicity constraints.  Do just one
-		 * transaction to avoid complexity.
-		 */
-		nr_pages = 2;
-		now = 1;
-	}
-	if (down) {
-		/*
-		 * String I/O in reverse.  Yuck.  Kill the guest, fix later.
-		 */
-		pr_unimpl(vcpu, "guest string pio down\n");
-		inject_gp(vcpu);
-		return 1;
-	}
-	vcpu->run->io.count = now;
-	vcpu->pio.cur_count = now;
-
-	if (vcpu->pio.cur_count == vcpu->pio.count)
-		kvm_x86_ops->skip_emulated_instruction(vcpu);
-
-	for (i = 0; i < nr_pages; ++i) {
-		mutex_lock(&vcpu->kvm->lock);
-		page = gva_to_page(vcpu, address + i * PAGE_SIZE);
-		vcpu->pio.guest_pages[i] = page;
-		mutex_unlock(&vcpu->kvm->lock);
-		if (!page) {
-			inject_gp(vcpu);
-			free_pio_guest_pages(vcpu);
-			return 1;
-		}
-	}
-
-	pio_dev = vcpu_find_pio_dev(vcpu, port);
-	if (!vcpu->pio.in) {
-		/* string PIO write */
-		ret = pio_copy_data(vcpu);
-		if (ret >= 0 && pio_dev) {
-			pio_string_write(pio_dev, vcpu);
-			complete_pio(vcpu);
-			if (vcpu->pio.count == 0)
-				ret = 1;
-		}
-	} else if (pio_dev)
-		pr_unimpl(vcpu, "no string pio read support yet, "
-		       "port %x size %d count %ld\n",
-			port, size, count);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
-
 /*
  * Check if userspace requested an interrupt window, and that the
  * interrupt window is open.
Index: kvm/drivers/kvm/x86.c
===================================================================
--- kvm.orig/drivers/kvm/x86.c	2007-10-30 18:07:32.000000000 +0100
+++ kvm/drivers/kvm/x86.c	2007-10-30 18:28:41.000000000 +0100
@@ -1342,6 +1342,249 @@
 }
 EXPORT_SYMBOL_GPL(emulate_instruction);
 
+static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i)
+		if (vcpu->pio.guest_pages[i]) {
+			kvm_release_page(vcpu->pio.guest_pages[i]);
+			vcpu->pio.guest_pages[i] = NULL;
+		}
+}
+
+static int pio_copy_data(struct kvm_vcpu *vcpu)
+{
+	void *p = vcpu->pio_data;
+	void *q;
+	unsigned bytes;
+	int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
+
+	q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
+		 PAGE_KERNEL);
+	if (!q) {
+		free_pio_guest_pages(vcpu);
+		return -ENOMEM;
+	}
+	q += vcpu->pio.guest_page_offset;
+	bytes = vcpu->pio.size * vcpu->pio.cur_count;
+	if (vcpu->pio.in)
+		memcpy(q, p, bytes);
+	else
+		memcpy(p, q, bytes);
+	q -= vcpu->pio.guest_page_offset;
+	vunmap(q);
+	free_pio_guest_pages(vcpu);
+	return 0;
+}
+
+int complete_pio(struct kvm_vcpu *vcpu)
+{
+	struct kvm_pio_request *io = &vcpu->pio;
+	long delta;
+	int r;
+
+	kvm_x86_ops->cache_regs(vcpu);
+
+	if (!io->string) {
+		if (io->in)
+			memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
+			       io->size);
+	} else {
+		if (io->in) {
+			r = pio_copy_data(vcpu);
+			if (r) {
+				kvm_x86_ops->cache_regs(vcpu);
+				return r;
+			}
+		}
+
+		delta = 1;
+		if (io->rep) {
+			delta *= io->cur_count;
+			/*
+			 * The size of the register should really depend on
+			 * current address size.
+			 */
+			vcpu->regs[VCPU_REGS_RCX] -= delta;
+		}
+		if (io->down)
+			delta = -delta;
+		delta *= io->size;
+		if (io->in)
+			vcpu->regs[VCPU_REGS_RDI] += delta;
+		else
+			vcpu->regs[VCPU_REGS_RSI] += delta;
+	}
+
+	kvm_x86_ops->decache_regs(vcpu);
+
+	io->count -= io->cur_count;
+	io->cur_count = 0;
+
+	return 0;
+}
+
+static void kernel_pio(struct kvm_io_device *pio_dev,
+		       struct kvm_vcpu *vcpu,
+		       void *pd)
+{
+	/* TODO: String I/O for in kernel device */
+
+	mutex_lock(&vcpu->kvm->lock);
+	if (vcpu->pio.in)
+		kvm_iodevice_read(pio_dev, vcpu->pio.port,
+				  vcpu->pio.size,
+				  pd);
+	else
+		kvm_iodevice_write(pio_dev, vcpu->pio.port,
+				   vcpu->pio.size,
+				   pd);
+	mutex_unlock(&vcpu->kvm->lock);
+}
+
+static void pio_string_write(struct kvm_io_device *pio_dev,
+			     struct kvm_vcpu *vcpu)
+{
+	struct kvm_pio_request *io = &vcpu->pio;
+	void *pd = vcpu->pio_data;
+	int i;
+
+	mutex_lock(&vcpu->kvm->lock);
+	for (i = 0; i < io->cur_count; i++) {
+		kvm_iodevice_write(pio_dev, io->port,
+				   io->size,
+				   pd);
+		pd += io->size;
+	}
+	mutex_unlock(&vcpu->kvm->lock);
+}
+
+static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
+					       gpa_t addr)
+{
+	return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
+}
+
+int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
+		  int size, unsigned port)
+{
+	struct kvm_io_device *pio_dev;
+
+	vcpu->run->exit_reason = KVM_EXIT_IO;
+	vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
+	vcpu->run->io.size = vcpu->pio.size = size;
+	vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
+	vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = 1;
+	vcpu->run->io.port = vcpu->pio.port = port;
+	vcpu->pio.in = in;
+	vcpu->pio.string = 0;
+	vcpu->pio.down = 0;
+	vcpu->pio.guest_page_offset = 0;
+	vcpu->pio.rep = 0;
+
+	kvm_x86_ops->cache_regs(vcpu);
+	memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
+	kvm_x86_ops->decache_regs(vcpu);
+
+	kvm_x86_ops->skip_emulated_instruction(vcpu);
+
+	pio_dev = vcpu_find_pio_dev(vcpu, port);
+	if (pio_dev) {
+		kernel_pio(pio_dev, vcpu, vcpu->pio_data);
+		complete_pio(vcpu);
+		return 1;
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_emulate_pio);
+
+int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
+		  int size, unsigned long count, int down,
+		  gva_t address, int rep, unsigned port)
+{
+	unsigned now, in_page;
+	int i, ret = 0;
+	int nr_pages = 1;
+	struct page *page;
+	struct kvm_io_device *pio_dev;
+
+	vcpu->run->exit_reason = KVM_EXIT_IO;
+	vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
+	vcpu->run->io.size = vcpu->pio.size = size;
+	vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
+	vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = count;
+	vcpu->run->io.port = vcpu->pio.port = port;
+	vcpu->pio.in = in;
+	vcpu->pio.string = 1;
+	vcpu->pio.down = down;
+	vcpu->pio.guest_page_offset = offset_in_page(address);
+	vcpu->pio.rep = rep;
+
+	if (!count) {
+		kvm_x86_ops->skip_emulated_instruction(vcpu);
+		return 1;
+	}
+
+	if (!down)
+		in_page = PAGE_SIZE - offset_in_page(address);
+	else
+		in_page = offset_in_page(address) + size;
+	now = min(count, (unsigned long)in_page / size);
+	if (!now) {
+		/*
+		 * String I/O straddles page boundary.  Pin two guest pages
+		 * so that we satisfy atomicity constraints.  Do just one
+		 * transaction to avoid complexity.
+		 */
+		nr_pages = 2;
+		now = 1;
+	}
+	if (down) {
+		/*
+		 * String I/O in reverse.  Yuck.  Kill the guest, fix later.
+		 */
+		pr_unimpl(vcpu, "guest string pio down\n");
+		inject_gp(vcpu);
+		return 1;
+	}
+	vcpu->run->io.count = now;
+	vcpu->pio.cur_count = now;
+
+	if (vcpu->pio.cur_count == vcpu->pio.count)
+		kvm_x86_ops->skip_emulated_instruction(vcpu);
+
+	for (i = 0; i < nr_pages; ++i) {
+		mutex_lock(&vcpu->kvm->lock);
+		page = gva_to_page(vcpu, address + i * PAGE_SIZE);
+		vcpu->pio.guest_pages[i] = page;
+		mutex_unlock(&vcpu->kvm->lock);
+		if (!page) {
+			inject_gp(vcpu);
+			free_pio_guest_pages(vcpu);
+			return 1;
+		}
+	}
+
+	pio_dev = vcpu_find_pio_dev(vcpu, port);
+	if (!vcpu->pio.in) {
+		/* string PIO write */
+		ret = pio_copy_data(vcpu);
+		if (ret >= 0 && pio_dev) {
+			pio_string_write(pio_dev, vcpu);
+			complete_pio(vcpu);
+			if (vcpu->pio.count == 0)
+				ret = 1;
+		}
+	} else if (pio_dev)
+		pr_unimpl(vcpu, "no string pio read support yet, "
+		       "port %x size %d count %ld\n",
+			port, size, count);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
+
 __init void kvm_arch_init(void)
 {
 	kvm_init_msr_list();
Index: kvm/drivers/kvm/x86.h
===================================================================
--- kvm.orig/drivers/kvm/x86.h	2007-10-30 18:07:32.000000000 +0100
+++ kvm/drivers/kvm/x86.h	2007-10-30 18:28:41.000000000 +0100
@@ -126,4 +126,5 @@
 }
 
 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
+int complete_pio(struct kvm_vcpu *vcpu);
 #endif



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Re: RFC/patch 2/3 portability: move x86 emulation and mmio device hook to x86.c

[Hollis Blanchard]

On Tue, 2007-10-30 at 18:44 +0100, Carsten Otte wrote:
> 
> -/*
> - * Only apic need an MMIO device hook, so shortcut now..
> - */
> -static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
> -                                               gpa_t addr)
> -{
> -       struct kvm_io_device *dev;
> -
> -       if (vcpu->apic) {
> -               dev = &vcpu->apic->dev;
> -               if (dev->in_range(dev, addr))
> -                       return dev;
> -       }
> -       return NULL;
> -}
> -
> -static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
> -                                               gpa_t addr)
> -{
> -       struct kvm_io_device *dev;
> -
> -       dev = vcpu_find_pervcpu_dev(vcpu, addr);
> -       if (dev == NULL)
> -               dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
> -       return dev;
> -}
> -
>  static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
>                                                gpa_t addr)
>  {
>         return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
>  }

These are APIC-specific for now, but as the "shortcut" comment implies
they should be generalized in the future, and I expect they will be
useful for PowerPC.

I'm fine with the patch as-is; I just want to point out that future work
will be needed in this area.

Acked-by: Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>

-- 
Hollis Blanchard
IBM Linux Technology Center


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Re: RFC/patch 3/3 portability: move pio emulation functions to x86.c

[Hollis Blanchard]

On Tue, 2007-10-30 at 18:44 +0100, Carsten Otte wrote:
> This patch moves implementation of the following functions from
> kvm_main.c to x86.c:
> free_pio_guest_pages, vcpu_find_pio_dev, pio_copy_data, complete_pio,
> kernel_pio, pio_string_write, kvm_emulate_pio, kvm_emulate_pio_string
> 
> The function inject_gp, which was duplicated by yesterday's patch
> series, is removed from kvm_main.c now because it is not needed
> anymore.
> 
> Signed-off-by: Carsten Otte <cotte-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>

Acked-by: Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>

-- 
Hollis Blanchard
IBM Linux Technology Center


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Re: RFC/patch 1/3 portability: move kvm_get/set_msr[_common] to x86.c

[Hollis Blanchard]

On Tue, 2007-10-30 at 18:44 +0100, Carsten Otte wrote:
> This patch moves the implementation of the functions of kvm_get/set_msr,
> kvm_get/set_msr_common, and set_efer from kvm_main.c to x86.c. The
> definition of EFER_RESERVED_BITS is moved too.
> 
> Signed-off-by: Carsten Otte <cotte-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>

Acked-by: Hollis Blanchard <hollisb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>

-- 
Hollis Blanchard
IBM Linux Technology Center


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Re: RFC/patch 2/3 portability: move x86 emulation and mmio device hook to x86.c

[Avi Kivity]

Hollis Blanchard wrote:
> On Tue, 2007-10-30 at 18:44 +0100, Carsten Otte wrote:
>   
>> -/*
>> - * Only apic need an MMIO device hook, so shortcut now..
>> - */
>> -static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
>> -                                               gpa_t addr)
>> -{
>> -       struct kvm_io_device *dev;
>> -
>> -       if (vcpu->apic) {
>> -               dev = &vcpu->apic->dev;
>> -               if (dev->in_range(dev, addr))
>> -                       return dev;
>> -       }
>> -       return NULL;
>> -}
>> -
>> -static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
>> -                                               gpa_t addr)
>> -{
>> -       struct kvm_io_device *dev;
>> -
>> -       dev = vcpu_find_pervcpu_dev(vcpu, addr);
>> -       if (dev == NULL)
>> -               dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
>> -       return dev;
>> -}
>> -
>>  static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
>>                                                gpa_t addr)
>>  {
>>         return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
>>  }
>>     
>
> These are APIC-specific for now, but as the "shortcut" comment implies
> they should be generalized in the future, and I expect they will be
> useful for PowerPC.
>
>   

For x86 there are two kinds of mmio devices: one is the expected 
system-wide mmio, and the other is mmio that depends not only on the 
address, but also on which cpu originated the request.  This type is 
only needed for the local apic.

Is the second type also useful for ppc?

-- 
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Re: RFC/patch 2/3 portability: move x86 emulation and mmio device hook to x86.c

[Hollis Blanchard]

On Wed, 2007-10-31 at 02:24 +0200, Avi Kivity wrote:
> 
> For x86 there are two kinds of mmio devices: one is the expected 
> system-wide mmio, and the other is mmio that depends not only on the 
> address, but also on which cpu originated the request.  This type is 
> only needed for the local apic.
> 
> Is the second type also useful for ppc?

Actually yes. At least OpenPIC (one of a variety of interrupt
controllers used on PowerPC systems) has per-CPU registers:
        A copy of each of these registers will be available to each CPU
        at the same physical address.

-- 
Hollis Blanchard
IBM Linux Technology Center


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Re: RFC/patch 2/3 portability: move x86 emulation and mmio device hook to x86.c

[Avi Kivity]

Hollis Blanchard wrote:
> On Wed, 2007-10-31 at 02:24 +0200, Avi Kivity wrote:
>   
>> For x86 there are two kinds of mmio devices: one is the expected 
>> system-wide mmio, and the other is mmio that depends not only on the 
>> address, but also on which cpu originated the request.  This type is 
>> only needed for the local apic.
>>
>> Is the second type also useful for ppc?
>>     
>
> Actually yes. At least OpenPIC (one of a variety of interrupt
> controllers used on PowerPC systems) has per-CPU registers:
>         A copy of each of these registers will be available to each CPU
>         at the same physical address.
>
>   

Okay, so we'll have to generalize that code and move it back.

-- 
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