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From 03f872b98f24e25cafb478b5d7c34e1eb18e1e4c Mon Sep 17 00:00:00 2001
From: Quan Xu <quan.xu@intel.com>
Date: Fri, 2 Jun 2017 12:30:34 +0100
Subject: [PATCH 1/4] 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@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---
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)
--
2.1.4
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