[PATCH][2/10] Extend the VMX intercept mechanism to include mmio as well as portio.

[PATCH][2/10] Extend the VMX intercept mechanism to include mmio as well as portio.

[Arun Sharma]

Extend the VMX intercept mechanism to include mmio as well as portio.

Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Signed-off-by: Xiaofeng Ling <xiaofeng.ling@intel.com>
Signed-off-by: Arun Sharma <arun.sharma@intel.com>

diff -r febfcd0a1a0a -r 9a43d5c12b95 xen/include/asm-x86/vmx_platform.h
--- a/xen/include/asm-x86/vmx_platform.h	Thu Jun 30 03:20:48 2005
+++ b/xen/include/asm-x86/vmx_platform.h	Thu Jun 30 04:08:50 2005
@@ -88,6 +88,7 @@
 extern void handle_mmio(unsigned long, unsigned long);
 extern void vmx_wait_io(void);
 extern int vmx_setup_platform(struct vcpu *, struct cpu_user_regs *);
+extern void vmx_io_assist(struct vcpu *v);
 
 // XXX - think about this -- maybe use bit 30 of the mfn to signify an MMIO frame.
 #define mmio_space(gpa) (!VALID_MFN(phys_to_machine_mapping((gpa) >> PAGE_SHIFT)))
diff -r febfcd0a1a0a -r 9a43d5c12b95 xen/arch/x86/vmx.c
--- a/xen/arch/x86/vmx.c	Thu Jun 30 03:20:48 2005
+++ b/xen/arch/x86/vmx.c	Thu Jun 30 04:08:50 2005
@@ -135,17 +135,20 @@
     }
 #endif
 
-    if (!vmx_paging_enabled(current))
+    if (!vmx_paging_enabled(current)){
         handle_mmio(va, va);
-
+        return 1;
+    }
     gpte = gva_to_gpte(va);
     if (!(l1e_get_flags(gpte) & _PAGE_PRESENT) )
             return 0;
     gpa = l1e_get_paddr(gpte) + (va & ~PAGE_MASK);
 
     /* Use 1:1 page table to identify MMIO address space */
-    if (mmio_space(gpa))
+    if (mmio_space(gpa)){
         handle_mmio(va, gpa);
+        return 1;
+    }
 
     result = shadow_fault(va, regs);
 
@@ -451,10 +454,9 @@
     p->port_mm = 0;
 
     /* Check if the packet needs to be intercepted */
-    if (vmx_io_intercept(p)) {
+    if (vmx_portio_intercept(p))
 	/* no blocking & no evtchn notification */
         return;
-    } 
 
     set_bit(ARCH_VMX_IO_WAIT, &d->arch.arch_vmx.flags);
     p->state = STATE_IOREQ_READY;
diff -r febfcd0a1a0a -r 9a43d5c12b95 xen/include/asm-x86/vmx_intercept.h
--- a/xen/include/asm-x86/vmx_intercept.h	Thu Jun 30 03:20:48 2005
+++ b/xen/include/asm-x86/vmx_intercept.h	Thu Jun 30 04:08:50 2005
@@ -1,4 +1,3 @@
-
 #ifndef _VMX_INTERCEPT_H
 #define _VMX_INTERCEPT_H
 
@@ -13,18 +12,45 @@
 
 typedef int (*intercept_action_t)(ioreq_t*);
 
+enum {PORTIO, MMIO};
+
 struct vmx_handler_t {
     int num_slot;
     struct {
         unsigned long       addr;
+        int type;
         unsigned long       offset;
         intercept_action_t  action;
     } hdl_list[MAX_IO_HANDLER];
 };
 
 /* global io interception point in HV */
-extern int vmx_io_intercept(ioreq_t*);
-extern int register_io_handler(unsigned long, unsigned long, intercept_action_t);
+extern int vmx_io_intercept(ioreq_t *p, int type);
+extern int register_io_handler(unsigned long addr, unsigned long offset, 
+                               intercept_action_t action, int type);
 
+static inline int vmx_portio_intercept(ioreq_t *p)
+{
+    return vmx_io_intercept(p, PORTIO);
+}
+
+static inline int vmx_mmio_intercept(ioreq_t *p)
+{
+    return vmx_io_intercept(p, MMIO);
+}
+
+static inline int register_portio_handler(unsigned long addr, 
+                                          unsigned long offset, 
+                                          intercept_action_t action)
+{
+    return register_io_handler(addr, offset, action, PORTIO);
+}
+
+static inline int register_mmio_handler(unsigned long addr, 
+                                        unsigned long offset, 
+                                        intercept_action_t action)
+{
+    return register_io_handler(addr, offset, action, MMIO);
+}
 
 #endif /* _VMX_INTERCEPT_H */
diff -r febfcd0a1a0a -r 9a43d5c12b95 xen/arch/x86/vmx_platform.c
--- a/xen/arch/x86/vmx_platform.c	Thu Jun 30 03:20:48 2005
+++ b/xen/arch/x86/vmx_platform.c	Thu Jun 30 04:08:50 2005
@@ -606,12 +606,11 @@
     if ((pvalid) && vmx_paging_enabled(current))
         p->u.pdata = (void *) gva_to_gpa(p->u.data);
 
-#if 0
-    printf("send_mmio_req: eip 0x%lx:0x%lx, dir %d, pdata_valid %d, ",
-	inst_decoder_regs->cs, inst_decoder_regs->eip, p->dir, p->pdata_valid);
-    printf("port_mm %d, size %lld, addr 0x%llx, value 0x%lx, count %lld\n",
-	p->port_mm, p->size, p->addr, value, p->count);
-#endif
+    if (vmx_mmio_intercept(p)){
+        p->state = STATE_IORESP_READY;
+        vmx_io_assist(d);
+        return;
+    }
 
     evtchn_send(iopacket_port(d->domain));
     vmx_wait_io();
@@ -709,6 +708,7 @@
             // Send the request and waiting for return value.
             mpci_p->mmio_target = mmio_inst.operand[1];
             send_mmio_req(gpa, &mmio_inst, value, IOREQ_READ, 0);
+            return;
         } else {
             // Write to MMIO
             if (mmio_inst.operand[0] & IMMEDIATE) {
@@ -728,6 +728,7 @@
     if (!strncmp((char *)mmio_inst.i_name, "stos", 4)) {
         send_mmio_req(gpa, &mmio_inst,
             inst_decoder_regs->eax, IOREQ_WRITE, 0);
+        return;
     }
 
     domain_crash_synchronous();
diff -r febfcd0a1a0a -r 9a43d5c12b95 xen/arch/x86/vmx_intercept.c
--- a/xen/arch/x86/vmx_intercept.c	Thu Jun 30 03:20:48 2005
+++ b/xen/arch/x86/vmx_intercept.c	Thu Jun 30 04:08:50 2005
@@ -31,14 +31,17 @@
 
 #ifdef CONFIG_VMX
 
-/* for intercepting io request after vm_exit, return value: 0--not handle; 1--handled */
-int vmx_io_intercept(ioreq_t *p)
+/* Check if the request is handled inside xen
+   return value: 0 --not handled; 1 --handled */
+int vmx_io_intercept(ioreq_t *p, int type)
 {
     struct vcpu *d = current;
     struct vmx_handler_t *handler = &(d->domain->arch.vmx_platform.vmx_handler);
     int i;
     unsigned long addr, offset;
     for (i = 0; i < handler->num_slot; i++) {
+        if( type != handler->hdl_list[i].type)
+            continue;
         addr   = handler->hdl_list[i].addr;
         offset = handler->hdl_list[i].offset;
         if (p->addr >= addr &&
@@ -48,7 +51,8 @@
     return 0;
 }
 
-int register_io_handler(unsigned long addr, unsigned long offset, intercept_action_t action)
+int register_io_handler(unsigned long addr, unsigned long offset, 
+                        intercept_action_t action, int type)
 {
     struct vcpu *d = current;
     struct vmx_handler_t *handler = &(d->domain->arch.vmx_platform.vmx_handler);
@@ -62,6 +66,7 @@
     handler->hdl_list[num].addr = addr;
     handler->hdl_list[num].offset = offset;
     handler->hdl_list[num].action = action;
+    handler->hdl_list[num].type = type;
     handler->num_slot++;
     return 1;
 
@@ -262,7 +267,7 @@
         p->state = STATE_IORESP_READY;
 
 	/* register handler to intercept the PIT io when vm_exit */
-	register_io_handler(0x40, 4, intercept_pit_io); 
+	register_portio_handler(0x40, 4, intercept_pit_io); 
     }
 
 }