From: Jan Beulich <jbeulich@suse.com>
Date: Wed, 22 Jun 2016 10:00:44 +0000 (+0200)
Subject: x86/vMSI-X: use generic intercept handler in place of MMIO one
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~881
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=c3a52bc6316a8b6f9f320e4848061328c67d0ed2;p=xen.git

x86/vMSI-X: use generic intercept handler in place of MMIO one

This allows us to see the full ioreq without having to peek into state
which is supposedly private to the emulation framework.

Suggested-by: Paul Durrant <Paul.Durrant@citrix.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
---

diff --git a/xen/arch/x86/hvm/vmsi.c b/xen/arch/x86/hvm/vmsi.c
index 7a2539eba4..e418b982d5 100644
--- a/xen/arch/x86/hvm/vmsi.c
+++ b/xen/arch/x86/hvm/vmsi.c
@@ -199,9 +199,8 @@ static struct msi_desc *msixtbl_addr_to_desc(
     return NULL;
 }
 
-static int msixtbl_read(
-    struct vcpu *v, unsigned long address,
-    unsigned int len, unsigned long *pval)
+static int msixtbl_read(const struct hvm_io_handler *handler,
+                        uint64_t address, uint32_t len, uint64_t *pval)
 {
     unsigned long offset;
     struct msixtbl_entry *entry;
@@ -213,7 +212,7 @@ static int msixtbl_read(
 
     rcu_read_lock(&msixtbl_rcu_lock);
 
-    entry = msixtbl_find_entry(v, address);
+    entry = msixtbl_find_entry(current, address);
     if ( !entry )
         goto out;
     offset = address & (PCI_MSIX_ENTRY_SIZE - 1);
@@ -333,23 +332,29 @@ out:
     return r;
 }
 
-static int msixtbl_range(struct vcpu *v, unsigned long addr)
+static int _msixtbl_write(const struct hvm_io_handler *handler,
+                          uint64_t address, uint32_t len, uint64_t val)
+{
+    return msixtbl_write(current, address, len, val);
+}
+
+static bool_t msixtbl_range(const struct hvm_io_handler *handler,
+                            const ioreq_t *r)
 {
+    struct vcpu *curr = current;
+    unsigned long addr = r->addr;
     const struct msi_desc *desc;
-    const ioreq_t *r;
+
+    ASSERT(r->type == IOREQ_TYPE_COPY);
 
     rcu_read_lock(&msixtbl_rcu_lock);
-    desc = msixtbl_addr_to_desc(msixtbl_find_entry(v, addr), addr);
+    desc = msixtbl_addr_to_desc(msixtbl_find_entry(curr, addr), addr);
     rcu_read_unlock(&msixtbl_rcu_lock);
 
     if ( desc )
         return 1;
 
-    r = &v->arch.hvm_vcpu.hvm_io.io_req;
-    if ( r->state != STATE_IOREQ_READY || r->addr != addr )
-        return 0;
-    ASSERT(r->type == IOREQ_TYPE_COPY);
-    if ( r->dir == IOREQ_WRITE )
+    if ( r->state == STATE_IOREQ_READY && r->dir == IOREQ_WRITE )
     {
         unsigned int size = r->size;
 
@@ -368,8 +373,8 @@ static int msixtbl_range(struct vcpu *v, unsigned long addr)
                   PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET) &&
                  !(data & PCI_MSIX_VECTOR_BITMASK) )
             {
-                v->arch.hvm_vcpu.hvm_io.msix_snoop_address = addr;
-                v->arch.hvm_vcpu.hvm_io.msix_snoop_gpa = 0;
+                curr->arch.hvm_vcpu.hvm_io.msix_snoop_address = addr;
+                curr->arch.hvm_vcpu.hvm_io.msix_snoop_gpa = 0;
             }
         }
         else if ( (size == 4 || size == 8) &&
@@ -386,9 +391,9 @@ static int msixtbl_range(struct vcpu *v, unsigned long addr)
             BUILD_BUG_ON((PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET + 4) &
                          (PCI_MSIX_ENTRY_SIZE - 1));
 
-            v->arch.hvm_vcpu.hvm_io.msix_snoop_address =
+            curr->arch.hvm_vcpu.hvm_io.msix_snoop_address =
                 addr + size * r->count - 4;
-            v->arch.hvm_vcpu.hvm_io.msix_snoop_gpa =
+            curr->arch.hvm_vcpu.hvm_io.msix_snoop_gpa =
                 r->data + size * r->count - 4;
         }
     }
@@ -396,10 +401,10 @@ static int msixtbl_range(struct vcpu *v, unsigned long addr)
     return 0;
 }
 
-static const struct hvm_mmio_ops msixtbl_mmio_ops = {
-    .check = msixtbl_range,
+static const struct hvm_io_ops msixtbl_mmio_ops = {
+    .accept = msixtbl_range,
     .read = msixtbl_read,
-    .write = msixtbl_write
+    .write = _msixtbl_write,
 };
 
 static void add_msixtbl_entry(struct domain *d,
@@ -544,13 +549,20 @@ found:
 
 void msixtbl_init(struct domain *d)
 {
+    struct hvm_io_handler *handler;
+
     if ( !has_hvm_container_domain(d) || !has_vlapic(d) ||
          d->arch.hvm_domain.msixtbl_list.next )
         return;
 
     INIT_LIST_HEAD(&d->arch.hvm_domain.msixtbl_list);
 
-    register_mmio_handler(d, &msixtbl_mmio_ops);
+    handler = hvm_next_io_handler(d);
+    if ( handler )
+    {
+        handler->type = IOREQ_TYPE_COPY;
+        handler->ops = &msixtbl_mmio_ops;
+    }
 }
 
 void msixtbl_pt_cleanup(struct domain *d)