From 096ca207af3a5eea9b0d954fb58e2e3e435918bf Mon Sep 17 00:00:00 2001
From: Alexey Kardashevskiy <aik@ozlabs.ru>
Date: Sat, 24 Feb 2018 19:23:19 -0500
Subject: [PATCH] memory: Add reporting of supported page sizes

Every IOMMU has some granularity which MemoryRegionIOMMUOps::translate
uses when translating, however this information is not available outside
the translate context for various checks.

This adds a get_min_page_size callback to MemoryRegionIOMMUOps and
a wrapper for it so IOMMU users (such as VFIO) can know the minimum
actual page size supported by an IOMMU.

As IOMMU MR represents a guest IOMMU, this uses TARGET_PAGE_SIZE
as fallback.

This removes vfio_container_granularity() and uses new helper in
memory_region_iommu_replay() when replaying IOMMU mappings on added
IOMMU memory region.

Backports the relevant parts of commit f682e9c244af7166225f4a50cc18ff296bb9d43e from qemu
---
 qemu/include/exec/memory.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/qemu/include/exec/memory.h b/qemu/include/exec/memory.h
index 1c84761a..8231aa8f 100644
--- a/qemu/include/exec/memory.h
+++ b/qemu/include/exec/memory.h
@@ -145,6 +145,8 @@ typedef struct MemoryRegionIOMMUOps MemoryRegionIOMMUOps;
 struct MemoryRegionIOMMUOps {
     /* Return a TLB entry that contains a given address. */
     IOMMUTLBEntry (*translate)(MemoryRegion *iommu, hwaddr addr, bool is_write);
+    /* Returns minimum supported page size */
+    uint64_t (*get_min_page_size)(MemoryRegion *iommu);
 };
 
 struct MemoryRegion {