passthrough: fix MSI-X table fixmap allocation

Currently, msix table pages are allocated a fixmap page per vector,
the available fixmap pages will be depleted when assigning devices
with large number of vectors.  This patch fixes it, and a bug that
prevents cross-page MSI-X table from working properly

It now allocates msix table fixmap pages per device, if the table
entries of two msix vectors share the same page, it will only be
mapped to fixmap once. A ref count is maintained so that it can
be unmapped when all the vectors are freed.

Also changes the meaning of msi_desc->mask_base from the va of msix
table start to the va of the target entry. The former one is currently
buggy (it always maps the first page but msix can support up to 2048
entries) and can't handle separately allocated pages.

Signed-off-by: Qing He <qing.he@intel.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/xen/include/asm-x86/msi.h b/xen/include/asm-x86/msi.h
index 1f18b7c5e3..a5f67e1655 100644
--- a/xen/include/asm-x86/msi.h
+++ b/xen/include/asm-x86/msi.h
@@ -49,9 +49,9 @@
 
 /* MAX fixed pages reserved for mapping MSIX tables. */
 #if defined(__x86_64__)
-#define MAX_MSIX_PAGES              512
+#define FIX_MSIX_MAX_PAGES              512
 #else
-#define MAX_MSIX_PAGES              32
+#define FIX_MSIX_MAX_PAGES              32
 #endif
 
 struct msi_info {
@@ -93,7 +93,7 @@ struct msi_desc {
 
 	struct list_head list;
 
-	void __iomem *mask_base;
+	void __iomem *mask_base;        /* va for the entry in mask table */
 	struct pci_dev *dev;
 	int vector;