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From 0c9c0fbb356e3210cb77b3d738be50981b26058a Mon Sep 17 00:00:00 2001
From: Jan Beulich <jbeulich@suse.com>
Date: Wed, 2 Oct 2019 13:36:59 +0200
Subject: [PATCH 1/2] IOMMU: add missing HVM check
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Fix an unguarded d->arch.hvm access in assign_device().
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
(cherry picked from commit 41fd1009cd7416b73d745a77c24b4e8d1a296fe6)
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
---
xen/drivers/passthrough/pci.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c
index 8108ed5f9a..d7420bd8bf 100644
--- a/xen/drivers/passthrough/pci.c
+++ b/xen/drivers/passthrough/pci.c
@@ -1452,7 +1452,8 @@ static int assign_device(struct domain *d, u16 seg, u8 bus, u8 devfn, u32 flag)
/* Prevent device assign if mem paging or mem sharing have been
* enabled for this domain */
- if ( unlikely(d->arch.hvm.mem_sharing_enabled ||
+ if ( unlikely((is_hvm_domain(d) &&
+ d->arch.hvm.mem_sharing_enabled) ||
vm_event_check_ring(d->vm_event_paging) ||
p2m_get_hostp2m(d)->global_logdirty) )
return -EXDEV;
--
2.11.0
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