From: Yan Zhao <yan.y.zhao@intel.com>
To: pbonzini@redhat.com
Cc: Auger Eric <eric.auger@redhat.com>,
Yan Zhao <yan.y.zhao@intel.com>,
qemu-devel@nongnu.org
Subject: [Qemu-devel] [PATCH v3] memory: warning on out of scope notification
Date: Mon, 24 Jun 2019 16:39:19 +0800 [thread overview]
Message-ID: <1561365559-10235-1-git-send-email-yan.y.zhao@intel.com> (raw)
In-Reply-To: <1561364781-6897-1-git-send-email-yan.y.zhao@intel.com>
if an entry has parts out of scope of notifier's range, print warning
message.
Out of scope mapping/unmapping would cause problem, as in below case:
1. initially there are two notifiers with ranges
0-0xfedfffff, 0xfef00000-0xffffffffffffffff,
IOVAs from 0x3c000000 - 0x3c1fffff is in shadow page table.
2. in vfio, memory_region_register_iommu_notifier() is followed by
memory_region_iommu_replay(), which will first call address space
unmap,
and walk and add back all entries in vtd shadow page table. e.g.
(1) for notifier 0-0xfedfffff,
IOVAs from 0 - 0xffffffff get unmapped,
and IOVAs from 0x3c000000 - 0x3c1fffff get mapped
(2) for notifier 0xfef00000-0xffffffffffffffff
IOVAs from 0 - 0x7fffffffff get unmapped,
but IOVAs from 0x3c000000 - 0x3c1fffff cannot get mapped back.
Cc: Auger Eric <eric.auger@redhat.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
---
v3:
refined code style and message format
v2:
1. added a local variable entry_end (Auger Eric)
2. using PRIx64 as format for address range in warning message
(Auger Eric)
---
memory.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/memory.c b/memory.c
index 0a089a7..c7154ab 100644
--- a/memory.c
+++ b/memory.c
@@ -1937,13 +1937,13 @@ void memory_region_notify_one(IOMMUNotifier *notifier,
IOMMUTLBEntry *entry)
{
IOMMUNotifierFlag request_flags;
+ hwaddr entry_end = entry->iova + entry->addr_mask;
/*
* Skip the notification if the notification does not overlap
* with registered range.
*/
- if (notifier->start > entry->iova + entry->addr_mask ||
- notifier->end < entry->iova) {
+ if (notifier->start > entry_end || notifier->end < entry->iova) {
return;
}
@@ -1953,6 +1953,15 @@ void memory_region_notify_one(IOMMUNotifier *notifier,
request_flags = IOMMU_NOTIFIER_UNMAP;
}
+ if (entry->iova < notifier->start || entry_end > notifier->end) {
+ warn_report("%s IOMMUTLBEntry 0x%" PRIx64 " - 0x%" PRIx64
+ " outside of notifier scope 0x%" PRIx64 " - 0x%" PRIx64,
+ (request_flags == IOMMU_NOTIFIER_MAP) ?
+ "Mapping" : "Unmapping",
+ entry->iova, entry->iova + entry->addr_mask,
+ notifier->start, notifier->end);
+ }
+
if (notifier->notifier_flags & request_flags) {
notifier->notify(notifier, entry);
}
--
2.7.4
next prev parent reply other threads:[~2019-06-24 8:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-24 8:26 [Qemu-devel] [PATCH v2] memory: warning on out of scope notification Yan Zhao
2019-06-24 8:39 ` Yan Zhao [this message]
2019-06-24 10:11 ` [Qemu-devel] [PATCH v3] " Auger Eric
2019-06-25 3:04 ` Yan Zhao
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