[PATCH V5] x86/vm_event: Added support for VM_EVENT_REASON_INTERRUPT

* [PATCH V5] x86/vm_event: Added support for VM_EVENT_REASON_INTERRUPT
@ 2016-11-11 16:09 Razvan Cojocaru
  2016-11-11 16:31 ` Jan Beulich
  2016-11-16  7:22 ` Tian, Kevin
  0 siblings, 2 replies; 15+ messages in thread
From: Razvan Cojocaru @ 2016-11-11 16:09 UTC (permalink / raw)
  To: xen-devel
  Cc: kevin.tian, tamas, suravee.suthikulpanit, Razvan Cojocaru,
	andrew.cooper3, julien.grall, jbeulich, sstabellini,
	jun.nakajima, boris.ostrovsky

Added support for a new event type, VM_EVENT_REASON_INTERRUPT,
which is now fired in a one-shot manner when enabled via the new
VM_EVENT_FLAG_GET_NEXT_INTERRUPT vm_event response flag.
The patch also fixes the behaviour of the xc_hvm_inject_trap()
hypercall, which would lead to non-architectural interrupts
overwriting pending (specifically reinjected) architectural ones.

Signed-off-by: Razvan Cojocaru <rcojocaru@bitdefender.com>
Acked-by: Tamas K Lengyel <tamas@tklengyel.com>

---
Changes since V4:
 - Fixed typo in vm_event_monitor_next_interrupt()
   ( v->arch.monitor.next_interrupt_enabled should have been set
   to true, not false ).

Changes in V4 since V3:
 - Const-ified struct vmcb_struct *vmcb in svm_get_pending_event().
 - Made next_interrupt_enabled into a bool.
---
 xen/arch/x86/hvm/hvm.c            | 22 +++++++++++++++++++++-
 xen/arch/x86/hvm/monitor.c        | 14 ++++++++++++++
 xen/arch/x86/hvm/svm/svm.c        | 15 +++++++++++++++
 xen/arch/x86/hvm/vmx/vmx.c        | 20 ++++++++++++++++++++
 xen/arch/x86/vm_event.c           |  5 +++++
 xen/common/vm_event.c             |  3 +++
 xen/include/asm-arm/vm_event.h    |  6 ++++++
 xen/include/asm-x86/domain.h      |  4 ++++
 xen/include/asm-x86/hvm/hvm.h     |  1 +
 xen/include/asm-x86/hvm/monitor.h |  2 ++
 xen/include/asm-x86/monitor.h     |  3 ++-
 xen/include/public/domctl.h       |  1 +
 xen/include/public/vm_event.h     | 18 ++++++++++++++++++
 xen/include/xen/vm_event.h        |  2 ++
 14 files changed, 114 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 704fd64..93af5b8 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -469,6 +469,12 @@ void hvm_migrate_pirqs(struct vcpu *v)
     spin_unlock(&d->event_lock);
 }
 
+static bool hvm_get_pending_event(struct vcpu *v, struct hvm_trap *info)
+{
+    info->cr2 = v->arch.hvm_vcpu.guest_cr[2];
+    return hvm_funcs.get_pending_event(v, info);
+}
+
 void hvm_do_resume(struct vcpu *v)
 {
     check_wakeup_from_wait();
@@ -535,9 +541,23 @@ void hvm_do_resume(struct vcpu *v)
     /* Inject pending hw/sw trap */
     if ( v->arch.hvm_vcpu.inject_trap.vector != -1 )
     {
-        hvm_inject_trap(&v->arch.hvm_vcpu.inject_trap);
+        if ( !hvm_event_pending(v) )
+            hvm_inject_trap(&v->arch.hvm_vcpu.inject_trap);
+
         v->arch.hvm_vcpu.inject_trap.vector = -1;
     }
+
+    if ( unlikely(v->arch.vm_event) && v->arch.monitor.next_interrupt_enabled )
+    {
+        struct hvm_trap info;
+
+        if ( hvm_get_pending_event(v, &info) )
+        {
+            hvm_monitor_interrupt(info.vector, info.type, info.error_code,
+                                  info.cr2);
+            v->arch.monitor.next_interrupt_enabled = false;
+        }
+    }
 }
 
 static int hvm_print_line(
diff --git a/xen/arch/x86/hvm/monitor.c b/xen/arch/x86/hvm/monitor.c
index 401a8c6..69a88ad 100644
--- a/xen/arch/x86/hvm/monitor.c
+++ b/xen/arch/x86/hvm/monitor.c
@@ -150,6 +150,20 @@ int hvm_monitor_cpuid(unsigned long insn_length, unsigned int leaf,
     return monitor_traps(curr, 1, &req);
 }
 
+void hvm_monitor_interrupt(unsigned int vector, unsigned int type,
+                           unsigned int err, uint64_t cr2)
+{
+    vm_event_request_t req = {
+        .reason = VM_EVENT_REASON_INTERRUPT,
+        .u.interrupt.x86.vector = vector,
+        .u.interrupt.x86.type = type,
+        .u.interrupt.x86.error_code = err,
+        .u.interrupt.x86.cr2 = cr2,
+    };
+
+    monitor_traps(current, 1, &req);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index c9dbbea..7fe27e4 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -2222,6 +2222,20 @@ static void svm_invlpg(struct vcpu *v, unsigned long vaddr)
     svm_asid_g_invlpg(v, vaddr);
 }
 
+static bool svm_get_pending_event(struct vcpu *v, struct hvm_trap *info)
+{
+    const struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
+
+    if ( vmcb->eventinj.fields.v )
+        return false;
+
+    info->vector = vmcb->eventinj.fields.vector;
+    info->type = vmcb->eventinj.fields.type;
+    info->error_code = vmcb->eventinj.fields.errorcode;
+
+    return true;
+}
+
 static struct hvm_function_table __initdata svm_function_table = {
     .name                 = "SVM",
     .cpu_up_prepare       = svm_cpu_up_prepare,
@@ -2252,6 +2266,7 @@ static struct hvm_function_table __initdata svm_function_table = {
     .inject_trap          = svm_inject_trap,
     .init_hypercall_page  = svm_init_hypercall_page,
     .event_pending        = svm_event_pending,
+    .get_pending_event    = svm_get_pending_event,
     .invlpg               = svm_invlpg,
     .cpuid_intercept      = svm_cpuid_intercept,
     .wbinvd_intercept     = svm_wbinvd_intercept,
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 9a8f694..961a20b 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -2134,6 +2134,25 @@ static int vmx_set_mode(struct vcpu *v, int mode)
     return 0;
 }
 
+static bool vmx_get_pending_event(struct vcpu *v, struct hvm_trap *info)
+{
+    unsigned long intr_info, error_code;
+
+    vmx_vmcs_enter(v);
+    __vmread(VM_ENTRY_INTR_INFO, &intr_info);
+    __vmread(VM_ENTRY_EXCEPTION_ERROR_CODE, &error_code);
+    vmx_vmcs_exit(v);
+
+    if ( !(intr_info & INTR_INFO_VALID_MASK) )
+        return false;
+
+    info->vector = MASK_EXTR(intr_info, INTR_INFO_VECTOR_MASK);
+    info->type = MASK_EXTR(intr_info, INTR_INFO_INTR_TYPE_MASK);
+    info->error_code = error_code;
+
+    return true;
+}
+
 static struct hvm_function_table __initdata vmx_function_table = {
     .name                 = "VMX",
     .cpu_up_prepare       = vmx_cpu_up_prepare,
@@ -2163,6 +2182,7 @@ static struct hvm_function_table __initdata vmx_function_table = {
     .inject_trap          = vmx_inject_trap,
     .init_hypercall_page  = vmx_init_hypercall_page,
     .event_pending        = vmx_event_pending,
+    .get_pending_event    = vmx_get_pending_event,
     .invlpg               = vmx_invlpg,
     .cpu_up               = vmx_cpu_up,
     .cpu_down             = vmx_cpu_down,
diff --git a/xen/arch/x86/vm_event.c b/xen/arch/x86/vm_event.c
index 1e88d67..e9a689c 100644
--- a/xen/arch/x86/vm_event.c
+++ b/xen/arch/x86/vm_event.c
@@ -134,6 +134,11 @@ void vm_event_set_registers(struct vcpu *v, vm_event_response_t *rsp)
     v->arch.user_regs.eip = rsp->data.regs.x86.rip;
 }
 
+void vm_event_monitor_next_interrupt(struct vcpu *v)
+{
+    v->arch.monitor.next_interrupt_enabled = true;
+}
+
 void vm_event_fill_regs(vm_event_request_t *req)
 {
     const struct cpu_user_regs *regs = guest_cpu_user_regs();
diff --git a/xen/common/vm_event.c b/xen/common/vm_event.c
index 907ab40..c947706 100644
--- a/xen/common/vm_event.c
+++ b/xen/common/vm_event.c
@@ -433,6 +433,9 @@ void vm_event_resume(struct domain *d, struct vm_event_domain *ved)
             if ( rsp.flags & VM_EVENT_FLAG_SET_REGISTERS )
                 vm_event_set_registers(v, &rsp);
 
+            if ( rsp.flags & VM_EVENT_FLAG_GET_NEXT_INTERRUPT )
+                vm_event_monitor_next_interrupt(v);
+
             if ( rsp.flags & VM_EVENT_FLAG_VCPU_PAUSED )
                 vm_event_vcpu_unpause(v);
         }
diff --git a/xen/include/asm-arm/vm_event.h b/xen/include/asm-arm/vm_event.h
index 66f2474..ab9c8cb 100644
--- a/xen/include/asm-arm/vm_event.h
+++ b/xen/include/asm-arm/vm_event.h
@@ -52,4 +52,10 @@ void vm_event_emulate_check(struct vcpu *v, vm_event_response_t *rsp)
     /* Not supported on ARM. */
 }
 
+static inline
+void vm_event_monitor_next_interrupt(struct vcpu *v)
+{
+    /* Not supported on ARM. */
+}
+
 #endif /* __ASM_ARM_VM_EVENT_H__ */
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index f6a40eb..4641a49 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -576,6 +576,10 @@ struct arch_vcpu
     XEN_GUEST_HANDLE(vcpu_time_info_t) time_info_guest;
 
     struct arch_vm_event *vm_event;
+
+    struct {
+        bool next_interrupt_enabled;
+    } monitor;
 };
 
 smap_check_policy_t smap_policy_change(struct vcpu *v,
diff --git a/xen/include/asm-x86/hvm/hvm.h b/xen/include/asm-x86/hvm/hvm.h
index 7e7462e..4cb76b5 100644
--- a/xen/include/asm-x86/hvm/hvm.h
+++ b/xen/include/asm-x86/hvm/hvm.h
@@ -157,6 +157,7 @@ struct hvm_function_table {
     void (*init_hypercall_page)(struct domain *d, void *hypercall_page);
 
     int  (*event_pending)(struct vcpu *v);
+    bool (*get_pending_event)(struct vcpu *v, struct hvm_trap *info);
     void (*invlpg)(struct vcpu *v, unsigned long vaddr);
 
     int  (*cpu_up_prepare)(unsigned int cpu);
diff --git a/xen/include/asm-x86/hvm/monitor.h b/xen/include/asm-x86/hvm/monitor.h
index 82b85ec..85ca678 100644
--- a/xen/include/asm-x86/hvm/monitor.h
+++ b/xen/include/asm-x86/hvm/monitor.h
@@ -42,6 +42,8 @@ int hvm_monitor_debug(unsigned long rip, enum hvm_monitor_debug_type type,
                       unsigned long trap_type, unsigned long insn_length);
 int hvm_monitor_cpuid(unsigned long insn_length, unsigned int leaf,
                       unsigned int subleaf);
+void hvm_monitor_interrupt(unsigned int vector, unsigned int type,
+                           unsigned int err, uint64_t cr2);
 
 #endif /* __ASM_X86_HVM_MONITOR_H__ */
 
diff --git a/xen/include/asm-x86/monitor.h b/xen/include/asm-x86/monitor.h
index 63a994b..e409373 100644
--- a/xen/include/asm-x86/monitor.h
+++ b/xen/include/asm-x86/monitor.h
@@ -76,7 +76,8 @@ static inline uint32_t arch_monitor_get_capabilities(struct domain *d)
                    (1U << XEN_DOMCTL_MONITOR_EVENT_SOFTWARE_BREAKPOINT) |
                    (1U << XEN_DOMCTL_MONITOR_EVENT_GUEST_REQUEST) |
                    (1U << XEN_DOMCTL_MONITOR_EVENT_DEBUG_EXCEPTION) |
-                   (1U << XEN_DOMCTL_MONITOR_EVENT_CPUID);
+                   (1U << XEN_DOMCTL_MONITOR_EVENT_CPUID) |
+                   (1U << XEN_DOMCTL_MONITOR_EVENT_INTERRUPT);
 
     /* Since we know this is on VMX, we can just call the hvm func */
     if ( hvm_is_singlestep_supported() )
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 177319d..85cbb7c 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -1086,6 +1086,7 @@ DEFINE_XEN_GUEST_HANDLE(xen_domctl_psr_cmt_op_t);
 #define XEN_DOMCTL_MONITOR_EVENT_DEBUG_EXCEPTION       5
 #define XEN_DOMCTL_MONITOR_EVENT_CPUID                 6
 #define XEN_DOMCTL_MONITOR_EVENT_PRIVILEGED_CALL       7
+#define XEN_DOMCTL_MONITOR_EVENT_INTERRUPT             8
 
 struct xen_domctl_monitor_op {
     uint32_t op; /* XEN_DOMCTL_MONITOR_OP_* */
diff --git a/xen/include/public/vm_event.h b/xen/include/public/vm_event.h
index c28be5a..b7487a1 100644
--- a/xen/include/public/vm_event.h
+++ b/xen/include/public/vm_event.h
@@ -105,6 +105,11 @@
  * if any of those flags are set, only those will be honored).
  */
 #define VM_EVENT_FLAG_SET_EMUL_INSN_DATA (1 << 9)
+/*
+ * Have a one-shot VM_EVENT_REASON_INTERRUPT event sent for the first
+ * interrupt pending after resuming the VCPU.
+ */
+#define VM_EVENT_FLAG_GET_NEXT_INTERRUPT (1 << 10)
 
 /*
  * Reasons for the vm event request
@@ -139,6 +144,8 @@
  *       These kinds of events will be filtered out in future versions.
  */
 #define VM_EVENT_REASON_PRIVILEGED_CALL         11
+/* An interrupt has been delivered. */
+#define VM_EVENT_REASON_INTERRUPT               12
 
 /* Supported values for the vm_event_write_ctrlreg index. */
 #define VM_EVENT_X86_CR0    0
@@ -259,6 +266,14 @@ struct vm_event_cpuid {
     uint32_t _pad;
 };
 
+struct vm_event_interrupt_x86 {
+    uint32_t vector;
+    uint32_t type;
+    uint32_t error_code;
+    uint32_t _pad;
+    uint64_t cr2;
+};
+
 #define MEM_PAGING_DROP_PAGE       (1 << 0)
 #define MEM_PAGING_EVICT_FAIL      (1 << 1)
 
@@ -302,6 +317,9 @@ typedef struct vm_event_st {
         struct vm_event_debug                 software_breakpoint;
         struct vm_event_debug                 debug_exception;
         struct vm_event_cpuid                 cpuid;
+        union {
+            struct vm_event_interrupt_x86     x86;
+        } interrupt;
     } u;
 
     union {
diff --git a/xen/include/xen/vm_event.h b/xen/include/xen/vm_event.h
index 4f088c8..2fb3951 100644
--- a/xen/include/xen/vm_event.h
+++ b/xen/include/xen/vm_event.h
@@ -78,6 +78,8 @@ void vm_event_vcpu_unpause(struct vcpu *v);
 void vm_event_fill_regs(vm_event_request_t *req);
 void vm_event_set_registers(struct vcpu *v, vm_event_response_t *rsp);
 
+void vm_event_monitor_next_interrupt(struct vcpu *v);
+
 #endif /* __VM_EVENT_H__ */
 
 /*
-- 
1.9.1


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