[PATCH 5/7] xen/vm-events: Move hvm_event_* functions to common-side.

[Corneliu ZUZU <czuzu@bitdefender.com>]

1. Moved hvm_event_traps, hvm_event_cr, hvm_event_guest_request,
	hvm_event_software_breakpoint from arch-side to common-side

  1.1. Moved arch/x86/hvm/event.c to common/hvm/event.c
	# see files: arch/x86/hvm/Makefile, xen/common/hvm/Makefile,
				 xen/common/hvm/event.c
	# changes:
		- moved hvm_event_fill_regs to arch-side (arch_hvm_event_fill_regs)
		- added vcpu parameter to hvm_event_traps
		- surrounded common hvm_event_* implementations w/ CONFIG_HAS_VM_EVENT_*
		- moved hvm_event_msr to arch-side (see x86/hvm/event_x86.c)
		- moved rip->gfn code in hvm_event_software_breakpoint to arch-side
			(see arch_hvm_event_gfn_of_ip) and renamed rip param to ip - i.e.
			now the parameter is a 'generic' instruction pointer, rather than
			the Intel X86_64 RIP register)

  1.2. Moved asm-x86/hvm/event.h to xen/hvm/event.h
	# see files: arch/x86/hvm/hvm.c, arch/x86/hvm/vmx/vmx.c

2. Added x86/hvm/event_x86.c => will rename in next commit to event.c (not done
in this commit to avoid git seeing this as being the modified old event.c =>
keeping the same name would have rendered an unnecessarily bulky diff)
	# see files: arch/x86/hvm/Makefile
	# implements X86-specific hvm_event_msr

3. Added asm-x86/hvm/event_arch.h, asm-arm/hvm/event_arch.h (renamed to
event.h in next commit, reason is the same as @ (2.).
	# define/implement: arch_hvm_event_fill_regs, arch_hvm_event_gfn_of_ip,
						hvm_event_msr (X86 side only)

Signed-off-by: Corneliu ZUZU <czuzu@bitdefender.com>
---
 xen/arch/x86/hvm/Makefile            |   2 +-
 xen/arch/x86/hvm/event.c             | 203 -----------------------------------
 xen/arch/x86/hvm/event_x86.c         |  51 +++++++++
 xen/arch/x86/hvm/hvm.c               |   3 +-
 xen/arch/x86/hvm/vmx/vmx.c           |   2 +-
 xen/common/hvm/Makefile              |   1 +
 xen/common/hvm/event.c               | 172 +++++++++++++++++++++++++++++
 xen/include/asm-arm/hvm/event_arch.h |  40 +++++++
 xen/include/asm-x86/hvm/event.h      |  44 --------
 xen/include/asm-x86/hvm/event_arch.h |  93 ++++++++++++++++
 xen/include/xen/hvm/event.h          |  71 ++++++++++++
 11 files changed, 432 insertions(+), 250 deletions(-)
 delete mode 100644 xen/arch/x86/hvm/event.c
 create mode 100644 xen/arch/x86/hvm/event_x86.c
 create mode 100644 xen/common/hvm/event.c
 create mode 100644 xen/include/asm-arm/hvm/event_arch.h
 delete mode 100644 xen/include/asm-x86/hvm/event.h
 create mode 100644 xen/include/asm-x86/hvm/event_arch.h
 create mode 100644 xen/include/xen/hvm/event.h

diff --git a/xen/arch/x86/hvm/Makefile b/xen/arch/x86/hvm/Makefile
index 794e793..15daa09 100644
--- a/xen/arch/x86/hvm/Makefile
+++ b/xen/arch/x86/hvm/Makefile
@@ -3,7 +3,7 @@ subdir-y += vmx
 
 obj-y += asid.o
 obj-y += emulate.o
-obj-y += event.o
+obj-y += event_x86.o
 obj-y += hpet.o
 obj-y += hvm.o
 obj-y += i8254.o
diff --git a/xen/arch/x86/hvm/event.c b/xen/arch/x86/hvm/event.c
deleted file mode 100644
index 5ffc485..0000000
--- a/xen/arch/x86/hvm/event.c
+++ /dev/null
@@ -1,203 +0,0 @@
-/*
-* event.c: Common hardware virtual machine event abstractions.
-*
-* Copyright (c) 2004, Intel Corporation.
-* Copyright (c) 2005, International Business Machines Corporation.
-* Copyright (c) 2008, Citrix Systems, Inc.
-*
-* This program is free software; you can redistribute it and/or modify it
-* under the terms and conditions of the GNU General Public License,
-* version 2, as published by the Free Software Foundation.
-*
-* This program is distributed in the hope it will be useful, but WITHOUT
-* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
-* more details.
-*
-* You should have received a copy of the GNU General Public License along with
-* this program; If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include <xen/vm_event.h>
-#include <xen/paging.h>
-#include <xen/monitor.h>
-#include <asm/hvm/event.h>
-#include <asm/altp2m.h>
-#include <public/vm_event.h>
-
-static void hvm_event_fill_regs(vm_event_request_t *req)
-{
-    const struct cpu_user_regs *regs = guest_cpu_user_regs();
-    const struct vcpu *curr = current;
-
-    req->data.regs.x86.rax = regs->eax;
-    req->data.regs.x86.rcx = regs->ecx;
-    req->data.regs.x86.rdx = regs->edx;
-    req->data.regs.x86.rbx = regs->ebx;
-    req->data.regs.x86.rsp = regs->esp;
-    req->data.regs.x86.rbp = regs->ebp;
-    req->data.regs.x86.rsi = regs->esi;
-    req->data.regs.x86.rdi = regs->edi;
-
-    req->data.regs.x86.r8  = regs->r8;
-    req->data.regs.x86.r9  = regs->r9;
-    req->data.regs.x86.r10 = regs->r10;
-    req->data.regs.x86.r11 = regs->r11;
-    req->data.regs.x86.r12 = regs->r12;
-    req->data.regs.x86.r13 = regs->r13;
-    req->data.regs.x86.r14 = regs->r14;
-    req->data.regs.x86.r15 = regs->r15;
-
-    req->data.regs.x86.rflags = regs->eflags;
-    req->data.regs.x86.rip    = regs->eip;
-
-    req->data.regs.x86.msr_efer = curr->arch.hvm_vcpu.guest_efer;
-    req->data.regs.x86.cr0 = curr->arch.hvm_vcpu.guest_cr[0];
-    req->data.regs.x86.cr3 = curr->arch.hvm_vcpu.guest_cr[3];
-    req->data.regs.x86.cr4 = curr->arch.hvm_vcpu.guest_cr[4];
-}
-
-static int hvm_event_traps(uint8_t sync, vm_event_request_t *req)
-{
-    int rc;
-    struct vcpu *curr = current;
-    struct domain *currd = curr->domain;
-
-    rc = vm_event_claim_slot(currd, &currd->vm_event->monitor);
-    switch ( rc )
-    {
-    case 0:
-        break;
-    case -ENOSYS:
-        /*
-         * If there was no ring to handle the event, then
-         * simply continue executing normally.
-         */
-        return 1;
-    default:
-        return rc;
-    };
-
-    if ( sync )
-    {
-        req->flags |= VM_EVENT_FLAG_VCPU_PAUSED;
-        vm_event_vcpu_pause(curr);
-    }
-
-    if ( altp2m_active(currd) )
-    {
-        req->flags |= VM_EVENT_FLAG_ALTERNATE_P2M;
-        req->altp2m_idx = vcpu_altp2m(curr).p2midx;
-    }
-
-    hvm_event_fill_regs(req);
-    vm_event_put_request(currd, &currd->vm_event->monitor, req);
-
-    return 1;
-}
-
-bool_t hvm_event_cr(unsigned int index, unsigned long value, unsigned long old)
-{
-    struct arch_domain *currad = &current->domain->arch;
-    unsigned int ctrlreg_bitmask = monitor_ctrlreg_bitmask(index);
-
-    if ( (currad->monitor.write_ctrlreg_enabled & ctrlreg_bitmask) &&
-         (!(currad->monitor.write_ctrlreg_onchangeonly & ctrlreg_bitmask) ||
-          value != old) )
-    {
-        vm_event_request_t req = {
-            .reason = VM_EVENT_REASON_WRITE_CTRLREG,
-            .vcpu_id = current->vcpu_id,
-            .u.write_ctrlreg.index = index,
-            .u.write_ctrlreg.new_value = value,
-            .u.write_ctrlreg.old_value = old
-        };
-
-        hvm_event_traps(currad->monitor.write_ctrlreg_sync & ctrlreg_bitmask,
-                        &req);
-        return 1;
-    }
-
-    return 0;
-}
-
-void hvm_event_msr(unsigned int msr, uint64_t value)
-{
-    struct vcpu *curr = current;
-    vm_event_request_t req = {
-        .reason = VM_EVENT_REASON_MOV_TO_MSR,
-        .vcpu_id = curr->vcpu_id,
-        .u.mov_to_msr.msr = msr,
-        .u.mov_to_msr.value = value,
-    };
-
-    if ( curr->domain->arch.monitor.mov_to_msr_enabled )
-        hvm_event_traps(1, &req);
-}
-
-void hvm_event_guest_request(void)
-{
-    struct vcpu *curr = current;
-    struct arch_domain *currad = &curr->domain->arch;
-
-    if ( currad->monitor.guest_request_enabled )
-    {
-        vm_event_request_t req = {
-            .reason = VM_EVENT_REASON_GUEST_REQUEST,
-            .vcpu_id = curr->vcpu_id,
-        };
-
-        hvm_event_traps(currad->monitor.guest_request_sync, &req);
-    }
-}
-
-int hvm_event_software_breakpoint(unsigned long rip, bool_t single_step)
-{
-    int rc = 0;
-    struct vcpu *curr = current;
-    struct arch_domain *ad = &curr->domain->arch;
-    bool_t enabled = ( single_step ? ad->monitor.singlestep_enabled
-                                   : ad->monitor.software_breakpoint_enabled );
-
-    if ( enabled )
-    {
-        uint64_t gfn;
-        struct segment_register sreg;
-        uint32_t pfec = PFEC_page_present | PFEC_insn_fetch;
-        vm_event_request_t req = {
-            .vcpu_id = curr->vcpu_id,
-        };
-
-        hvm_get_segment_register(curr, x86_seg_ss, &sreg);
-        if ( sreg.attr.fields.dpl == 3 )
-            pfec |= PFEC_user_mode;
-
-        hvm_get_segment_register(curr, x86_seg_cs, &sreg);
-        gfn = paging_gva_to_gfn(curr, sreg.base + rip, &pfec);
-
-        if ( single_step )
-        {
-            req.reason = VM_EVENT_REASON_SINGLESTEP;
-            req.u.singlestep.gfn = gfn;
-        }
-        else
-        {
-            req.reason = VM_EVENT_REASON_SOFTWARE_BREAKPOINT;
-            req.u.software_breakpoint.gfn = gfn;
-        }
-
-        rc = hvm_event_traps(1, &req);
-    }
-
-    return rc;
-}
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/xen/arch/x86/hvm/event_x86.c b/xen/arch/x86/hvm/event_x86.c
new file mode 100644
index 0000000..7b54f18
--- /dev/null
+++ b/xen/arch/x86/hvm/event_x86.c
@@ -0,0 +1,51 @@
+/*
+ * arch/x86/hvm/event_x86.c
+ *
+ * Arch-specific hardware virtual machine event abstractions.
+ *
+ * Copyright (c) 2004, Intel Corporation.
+ * Copyright (c) 2005, International Business Machines Corporation.
+ * Copyright (c) 2008, Citrix Systems, Inc.
+ * Copyright (c) 2016, Bitdefender S.R.L.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <xen/hvm/event.h>
+
+void hvm_event_msr(unsigned int msr, uint64_t value)
+{
+    struct vcpu *curr = current;
+
+    if ( curr->domain->arch.monitor.mov_to_msr_enabled )
+    {
+        vm_event_request_t req = {
+            .reason = VM_EVENT_REASON_MOV_TO_MSR,
+            .vcpu_id = curr->vcpu_id,
+            .u.mov_to_msr.msr = msr,
+            .u.mov_to_msr.value = value,
+        };
+
+        hvm_event_traps(curr, 1, &req);
+    }
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 9063eb5..d90ca10 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -33,6 +33,7 @@
 #include <xen/event.h>
 #include <xen/paging.h>
 #include <xen/monitor.h>
+#include <xen/hvm/event.h>
 #include <xen/cpu.h>
 #include <xen/wait.h>
 #include <xen/mem_access.h>
@@ -58,7 +59,7 @@
 #include <asm/hvm/cacheattr.h>
 #include <asm/hvm/trace.h>
 #include <asm/hvm/nestedhvm.h>
-#include <asm/hvm/event.h>
+#include <asm/hvm/event_arch.h>
 #include <asm/hvm/vmx/vmx.h>
 #include <asm/hvm/svm/svm.h> /* for cpu_has_tsc_ratio */
 #include <asm/altp2m.h>
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index f7708fe..23e7bc5 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -26,6 +26,7 @@
 #include <xen/hypercall.h>
 #include <xen/perfc.h>
 #include <xen/monitor.h>
+#include <xen/hvm/event.h>
 #include <asm/current.h>
 #include <asm/io.h>
 #include <asm/iocap.h>
@@ -51,7 +52,6 @@
 #include <asm/hvm/vpt.h>
 #include <public/hvm/save.h>
 #include <asm/hvm/trace.h>
-#include <asm/hvm/event.h>
 #include <asm/xenoprof.h>
 #include <asm/debugger.h>
 #include <asm/apic.h>
diff --git a/xen/common/hvm/Makefile b/xen/common/hvm/Makefile
index a464a57..66ae866 100644
--- a/xen/common/hvm/Makefile
+++ b/xen/common/hvm/Makefile
@@ -1 +1,2 @@
+obj-y += event.o
 obj-y += save.o
diff --git a/xen/common/hvm/event.c b/xen/common/hvm/event.c
new file mode 100644
index 0000000..149ea79
--- /dev/null
+++ b/xen/common/hvm/event.c
@@ -0,0 +1,172 @@
+/*
+* xen/common/hvm/event.c
+*
+* Common hardware virtual machine event abstractions.
+*
+* Copyright (c) 2004, Intel Corporation.
+* Copyright (c) 2005, International Business Machines Corporation.
+* Copyright (c) 2008, Citrix Systems, Inc.
+* Copyright (c) 2016, Bitdefender S.R.L.
+*
+* This program is free software; you can redistribute it and/or modify it
+* under the terms and conditions of the GNU General Public License,
+* version 2, as published by the Free Software Foundation.
+*
+* This program is distributed in the hope it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+* more details.
+*
+* You should have received a copy of the GNU General Public License along with
+* this program; If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <xen/hvm/event.h>
+#include <xen/vm_event.h>           /* for vm_event_# calls */
+#include <xen/monitor.h>
+#include <asm/hvm/event_arch.h>     /* for hvm_event_arch_# calls */
+#if CONFIG_X86
+#include <asm/altp2m.h>
+#endif
+
+int hvm_event_traps(struct vcpu *v,
+                    uint8_t sync,
+                    vm_event_request_t *req)
+{
+    int rc;
+    struct domain *d = v->domain;
+
+    rc = vm_event_claim_slot(d, &d->vm_event->monitor);
+    switch ( rc )
+    {
+    case 0:
+        break;
+    case -ENOSYS:
+        /*
+         * If there was no ring to handle the event, then
+         * simply continue executing normally.
+         */
+        return 1;
+    default:
+        return rc;
+    };
+
+    if ( sync )
+    {
+        req->flags |= VM_EVENT_FLAG_VCPU_PAUSED;
+        vm_event_vcpu_pause(v);
+    }
+
+#if CONFIG_X86
+    if ( altp2m_active(d) )
+    {
+        req->flags |= VM_EVENT_FLAG_ALTERNATE_P2M;
+        req->altp2m_idx = vcpu_altp2m(v).p2midx;
+    }
+#endif
+
+    arch_hvm_event_fill_regs(req);
+
+    vm_event_put_request(d, &d->vm_event->monitor, req);
+
+    return 1;
+}
+
+#if CONFIG_HAS_VM_EVENT_WRITE_CTRLREG
+
+bool_t hvm_event_cr(unsigned int index,
+                    unsigned long value,
+                    unsigned long old)
+{
+    struct vcpu *curr = current;
+    struct arch_domain *ad = &curr->domain->arch;
+    unsigned int ctrlreg_bitmask = monitor_ctrlreg_bitmask(index);
+
+    if ( (ad->monitor.write_ctrlreg_enabled & ctrlreg_bitmask) &&
+         (!(ad->monitor.write_ctrlreg_onchangeonly & ctrlreg_bitmask) ||
+          value != old) )
+    {
+        bool_t sync = !!(ad->monitor.write_ctrlreg_sync & ctrlreg_bitmask);
+
+        vm_event_request_t req = {
+            .reason = VM_EVENT_REASON_WRITE_CTRLREG,
+            .vcpu_id = curr->vcpu_id,
+            .u.write_ctrlreg.index = index,
+            .u.write_ctrlreg.new_value = value,
+            .u.write_ctrlreg.old_value = old
+        };
+
+        hvm_event_traps(curr, sync, &req);
+        return 1;
+    }
+
+    return 0;
+}
+
+#endif // HAS_VM_EVENT_WRITE_CTRLREG
+
+#if CONFIG_HAS_VM_EVENT_GUEST_REQUEST
+
+void hvm_event_guest_request(void)
+{
+    struct vcpu *curr = current;
+    struct arch_domain *ad = &curr->domain->arch;
+
+    if ( ad->monitor.guest_request_enabled )
+    {
+        vm_event_request_t req = {
+            .reason = VM_EVENT_REASON_GUEST_REQUEST,
+            .vcpu_id = curr->vcpu_id,
+        };
+
+        hvm_event_traps(curr, ad->monitor.guest_request_sync, &req);
+    }
+}
+
+#endif // HAS_VM_EVENT_GUEST_REQUEST
+
+#if CONFIG_HAS_VM_EVENT_SINGLESTEP || CONFIG_HAS_VM_EVENT_SOFTWARE_BREAKPOINT
+
+int hvm_event_software_breakpoint(unsigned long ip, bool_t single_step)
+{
+    int rc = 0;
+    struct vcpu *curr = current;
+    struct arch_domain *ad = &curr->domain->arch;
+    bool_t enabled = ( single_step ? ad->monitor.singlestep_enabled
+                                   : ad->monitor.software_breakpoint_enabled );
+
+    if ( enabled )
+    {
+        uint64_t gfn = arch_hvm_event_gfn_of_ip(ip);
+        vm_event_request_t req = {
+            .vcpu_id = curr->vcpu_id,
+        };
+
+        if ( single_step )
+        {
+            req.reason = VM_EVENT_REASON_SINGLESTEP;
+            req.u.singlestep.gfn = gfn;
+        }
+        else
+        {
+            req.reason = VM_EVENT_REASON_SOFTWARE_BREAKPOINT;
+            req.u.software_breakpoint.gfn = gfn;
+        }
+
+        rc = hvm_event_traps(curr, 1, &req);
+    }
+
+    return rc;
+}
+
+#endif // HAS_VM_EVENT_SINGLESTEP || HAS_VM_EVENT_SOFTWARE_BREAKPOINT
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/asm-arm/hvm/event_arch.h b/xen/include/asm-arm/hvm/event_arch.h
new file mode 100644
index 0000000..beebca2
--- /dev/null
+++ b/xen/include/asm-arm/hvm/event_arch.h
@@ -0,0 +1,40 @@
+/*
+ * include/asm-arm/hvm/event_arch.h
+ *
+ * Arch-specific hardware virtual machine event abstractions.
+ *
+ * Copyright (c) 2016, Bitdefender S.R.L.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ASM_ARM_HVM_EVENT_ARCH_H__
+#define __ASM_ARM_HVM_EVENT_ARCH_H__
+
+static inline
+void arch_hvm_event_fill_regs(vm_event_request_t *req)
+{
+    /* Not supported on ARM. */
+}
+
+#endif /* __ASM_ARM_HVM_EVENT_ARCH_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/asm-x86/hvm/event.h b/xen/include/asm-x86/hvm/event.h
deleted file mode 100644
index 7c2252b..0000000
--- a/xen/include/asm-x86/hvm/event.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/*
- * event.h: Hardware virtual machine assist events.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; If not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef __ASM_X86_HVM_EVENT_H__
-#define __ASM_X86_HVM_EVENT_H__
-
-/*
- * Called for current VCPU on crX/MSR changes by guest.
- * The event might not fire if the client has subscribed to it in onchangeonly
- * mode, hence the bool_t return type for control register write events.
- */
-bool_t hvm_event_cr(unsigned int index, unsigned long value,
-                    unsigned long old);
-#define hvm_event_crX(what, new, old) \
-    hvm_event_cr(VM_EVENT_X86_##what, new, old)
-void hvm_event_msr(unsigned int msr, uint64_t value);
-int hvm_event_software_breakpoint(unsigned long rip,
-                                  bool_t single_step);
-void hvm_event_guest_request(void);
-
-#endif /* __ASM_X86_HVM_EVENT_H__ */
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/xen/include/asm-x86/hvm/event_arch.h b/xen/include/asm-x86/hvm/event_arch.h
new file mode 100644
index 0000000..b9fb559
--- /dev/null
+++ b/xen/include/asm-x86/hvm/event_arch.h
@@ -0,0 +1,93 @@
+/*
+ * include/asm-x86/hvm/event_arch.h
+ * 
+ * Arch-specific hardware virtual machine event abstractions.
+ * 
+ * Copyright (c) 2016, Bitdefender S.R.L.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ASM_X86_HVM_EVENT_ARCH_H__
+#define __ASM_X86_HVM_EVENT_ARCH_H__
+
+#include <xen/sched.h>
+#include <xen/paging.h>
+#include <public/vm_event.h>
+
+static inline
+void arch_hvm_event_fill_regs(vm_event_request_t *req)
+{
+    const struct cpu_user_regs *regs = guest_cpu_user_regs();
+    const struct vcpu *curr = current;
+
+    req->data.regs.x86.rax = regs->eax;
+    req->data.regs.x86.rcx = regs->ecx;
+    req->data.regs.x86.rdx = regs->edx;
+    req->data.regs.x86.rbx = regs->ebx;
+    req->data.regs.x86.rsp = regs->esp;
+    req->data.regs.x86.rbp = regs->ebp;
+    req->data.regs.x86.rsi = regs->esi;
+    req->data.regs.x86.rdi = regs->edi;
+
+    req->data.regs.x86.r8  = regs->r8;
+    req->data.regs.x86.r9  = regs->r9;
+    req->data.regs.x86.r10 = regs->r10;
+    req->data.regs.x86.r11 = regs->r11;
+    req->data.regs.x86.r12 = regs->r12;
+    req->data.regs.x86.r13 = regs->r13;
+    req->data.regs.x86.r14 = regs->r14;
+    req->data.regs.x86.r15 = regs->r15;
+
+    req->data.regs.x86.rflags = regs->eflags;
+    req->data.regs.x86.rip    = regs->eip;
+
+    req->data.regs.x86.msr_efer = curr->arch.hvm_vcpu.guest_efer;
+    req->data.regs.x86.cr0 = curr->arch.hvm_vcpu.guest_cr[0];
+    req->data.regs.x86.cr3 = curr->arch.hvm_vcpu.guest_cr[3];
+   req->data.regs.x86.cr4 = curr->arch.hvm_vcpu.guest_cr[4];
+}
+
+/*
+ * Returns the GFN of the given instruction pointer.
+ * Needed by hvm_event_software_breakpoint.
+ */
+static inline
+uint64_t arch_hvm_event_gfn_of_ip(unsigned long ip)
+{
+    struct vcpu *curr = current;
+    struct segment_register sreg;
+    uint32_t pfec = PFEC_page_present | PFEC_insn_fetch;
+
+    hvm_get_segment_register(curr, x86_seg_ss, &sreg);
+    if ( 3 == sreg.attr.fields.dpl )
+        pfec |= PFEC_user_mode;
+
+    hvm_get_segment_register(curr, x86_seg_cs, &sreg);
+
+    return (uint64_t) paging_gva_to_gfn(curr, sreg.base + ip, &pfec);
+}
+
+void hvm_event_msr(unsigned int msr, uint64_t value);
+
+#endif /* __ASM_X86_HVM_EVENT_ARCH_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/include/xen/hvm/event.h b/xen/include/xen/hvm/event.h
new file mode 100644
index 0000000..85e63d6
--- /dev/null
+++ b/xen/include/xen/hvm/event.h
@@ -0,0 +1,71 @@
+/*
+ * include/xen/hvm/event.h
+ *
+ * Common hardware virtual machine event abstractions.
+ *
+ * Copyright (c) 2016, Bitdefender S.R.L.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __HVM_EVENT_H__
+#define __HVM_EVENT_H__
+
+#include <xen/sched.h>              /* for struct vcpu */
+#include <public/vm_event.h>        /* for vm_event_request_t */
+
+#if CONFIG_HAS_VM_EVENT_WRITE_CTRLREG
+
+/*
+ * Called for current VCPU on crX/MSR changes by guest.
+ * The event might not fire if the client has subscribed to it in onchangeonly
+ * mode, hence the bool_t return type for control register write events.
+ */
+bool_t hvm_event_cr(unsigned int index,
+                    unsigned long value,
+                    unsigned long old);
+
+#if CONFIG_X86
+#define hvm_event_crX(what, new, old) \
+    hvm_event_cr(VM_EVENT_X86_##what, new, old)
+#endif
+
+#endif // HAS_VM_EVENT_WRITE_CTRLREG
+
+#if CONFIG_HAS_VM_EVENT_SINGLESTEP || CONFIG_HAS_VM_EVENT_SOFTWARE_BREAKPOINT
+
+int hvm_event_software_breakpoint(unsigned long ip,
+                                  bool_t single_step);
+#endif // HAS_VM_EVENT_SINGLESTEP || HAS_VM_EVENT_SOFTWARE_BREAKPOINT
+
+#if CONFIG_HAS_VM_EVENT_GUEST_REQUEST
+
+void hvm_event_guest_request(void);
+
+#endif // HAS_VM_EVENT_GUEST_REQUEST
+
+int hvm_event_traps(struct vcpu *v,
+                    uint8_t sync,
+                    vm_event_request_t *req);
+
+#endif /* __HVM_EVENT_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
2.5.0