[Xen-devel] [PATCH 2/2][RESEND] ioemu: guest MSI config on disable

[Qing He <qing.he@xxxxxxxxx>]

On Wed, 2009-04-15 at 21:41 +0800, Qing He wrote:
> It's possible for a guest to change the MSI vector or flags
> when MSI is disabled, after it's first initialized. This patch
> handles the address and data update when it's disabled.
> 
> Signed-off-by: Qing He <qing.he@xxxxxxxxx>
> ---

Just realized that I was not based on the latest code, here is the
update patch, please ignore the previous one.

---
diff --git a/hw/pass-through.c b/hw/pass-through.c
index 11382fd..710acbf 100644
--- a/hw/pass-through.c
+++ b/hw/pass-through.c
@@ -3436,7 +3436,7 @@ static int pt_msgaddr32_reg_write(struct pt_dev *ptdev,
     /* update MSI */
     if (cfg_entry->data != old_addr)
     {
-        if (ptdev->msi->flags & PCI_MSI_FLAGS_ENABLE)
+        if (ptdev->msi->flags & PT_MSI_MAPPED)
             pt_msi_update(ptdev);
     }
 
@@ -3474,7 +3474,7 @@ static int pt_msgaddr64_reg_write(struct pt_dev *ptdev,
     /* update MSI */
     if (cfg_entry->data != old_addr)
     {
-        if (ptdev->msi->flags & PCI_MSI_FLAGS_ENABLE)
+        if (ptdev->msi->flags & PT_MSI_MAPPED)
             pt_msi_update(ptdev);
     }
 
@@ -3516,7 +3516,7 @@ static int pt_msgdata_reg_write(struct pt_dev *ptdev,
     /* update MSI */
     if (cfg_entry->data != old_data)
     {
-        if (flags & PCI_MSI_FLAGS_ENABLE)
+        if (flags & PT_MSI_MAPPED)
             pt_msi_update(ptdev);
     }
 
diff --git a/hw/pt-msi.c b/hw/pt-msi.c
index 4a54ba3..9f4a3b3 100644
--- a/hw/pt-msi.c
+++ b/hw/pt-msi.c
@@ -110,10 +110,6 @@ uint32_t __get_msi_gflags(uint32_t data, uint64_t addr)
     return result;
 }
 
-/*
- * Update msi mapping, usually called when MSI enabled,
- * except the first time
- */
 int pt_msi_update(struct pt_dev *d)
 {
     uint8_t gvec = 0;
@@ -126,7 +122,8 @@ int pt_msi_update(struct pt_dev *d)
     addr = (uint64_t)d->msi->addr_hi << 32 | d->msi->addr_lo;
     gflags = __get_msi_gflags(d->msi->data, addr);
 
-    PT_LOG("Update msi with pirq %x gvec %x\n", d->msi->pirq, gvec);
+    PT_LOG("Update msi with pirq %x gvec %x gflags %x\n",
+           d->msi->pirq, gvec, gflags);
 
     ret = xc_domain_update_msi_irq(xc_handle, domid, gvec,
                                      d->msi->pirq, gflags, 0);

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