[Xen-changelog] [xen stable-4.7] IOMMU: handle IOMMU mapping and unmapping failures

[patchbot@xxxxxxx]

commit 15f428ae7a4b7c21e6b9d466c21fdb57ea823b62
Author:     Quan Xu <quan.xu@xxxxxxxxx>
AuthorDate: Tue Jun 20 16:14:06 2017 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jun 20 16:14:06 2017 +0200

    IOMMU: handle IOMMU mapping and unmapping failures
    
    Treat IOMMU mapping and unmapping failures as a fatal to the DomU
    If IOMMU mapping and unmapping failed, crash the DomU and propagate
    the error up to the call trees.
    
    No spamming of the log can occur. For DomU, we avoid logging any
    message for already dying domains. For Dom0, that'll still be more
    verbose than we'd really like, but it at least wouldn't outright
    flood the console.
    
    Signed-off-by: Quan Xu <quan.xu@xxxxxxxxx>
    Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: 834c97baebb3743c54bcae228e984ae1b9692e6a
    master date: 2016-06-14 15:10:57 +0200
---
 xen/drivers/passthrough/iommu.c | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index 1a315ee..927966f 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -239,21 +239,47 @@ int iommu_map_page(struct domain *d, unsigned long gfn, 
unsigned long mfn,
                    unsigned int flags)
 {
     const struct domain_iommu *hd = dom_iommu(d);
+    int rc;
 
     if ( !iommu_enabled || !hd->platform_ops )
         return 0;
 
-    return hd->platform_ops->map_page(d, gfn, mfn, flags);
+    rc = hd->platform_ops->map_page(d, gfn, mfn, flags);
+    if ( unlikely(rc) )
+    {
+        if ( !d->is_shutting_down && printk_ratelimit() )
+            printk(XENLOG_ERR
+                   "d%d: IOMMU mapping gfn %#lx to mfn %#lx failed: %d\n",
+                   d->domain_id, gfn, mfn, rc);
+
+        if ( !is_hardware_domain(d) )
+            domain_crash(d);
+    }
+
+    return rc;
 }
 
 int iommu_unmap_page(struct domain *d, unsigned long gfn)
 {
     const struct domain_iommu *hd = dom_iommu(d);
+    int rc;
 
     if ( !iommu_enabled || !hd->platform_ops )
         return 0;
 
-    return hd->platform_ops->unmap_page(d, gfn);
+    rc = hd->platform_ops->unmap_page(d, gfn);
+    if ( unlikely(rc) )
+    {
+        if ( !d->is_shutting_down && printk_ratelimit() )
+            printk(XENLOG_ERR
+                   "d%d: IOMMU unmapping gfn %#lx failed: %d\n",
+                   d->domain_id, gfn, rc);
+
+        if ( !is_hardware_domain(d) )
+            domain_crash(d);
+    }
+
+    return rc;
 }
 
 static void iommu_free_pagetables(unsigned long unused)
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.7

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