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[PATCH] hw/net/vmxnet3: Do not abort QEMU if guest specified bad queue n
From: |
Thomas Huth |
Subject: |
[PATCH] hw/net/vmxnet3: Do not abort QEMU if guest specified bad queue numbers |
Date: |
Wed, 21 Jul 2021 16:15:59 +0200 |
QEMU should never terminate unexpectedly just because the guest is
doing something wrong like specifying wrong queue numbers. Let's
simply refuse to set the device active in this case.
Buglink: https://bugs.launchpad.net/qemu/+bug/1890160
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
hw/net/vmxnet3.c | 34 ++++++++++++++++++++++------------
1 file changed, 22 insertions(+), 12 deletions(-)
diff --git a/hw/net/vmxnet3.c b/hw/net/vmxnet3.c
index f6bd8c53b1..41f796a247 100644
--- a/hw/net/vmxnet3.c
+++ b/hw/net/vmxnet3.c
@@ -1381,7 +1381,7 @@ static void vmxnet3_validate_interrupts(VMXNET3State *s)
}
}
-static void vmxnet3_validate_queues(VMXNET3State *s)
+static bool vmxnet3_validate_queues(VMXNET3State *s)
{
/*
* txq_num and rxq_num are total number of queues
@@ -1390,12 +1390,18 @@ static void vmxnet3_validate_queues(VMXNET3State *s)
*/
if (s->txq_num > VMXNET3_DEVICE_MAX_TX_QUEUES) {
- hw_error("Bad TX queues number: %d\n", s->txq_num);
+ qemu_log_mask(LOG_GUEST_ERROR, "vmxnet3: Bad TX queues number: %d\n",
+ s->txq_num);
+ return false;
}
if (s->rxq_num > VMXNET3_DEVICE_MAX_RX_QUEUES) {
- hw_error("Bad RX queues number: %d\n", s->rxq_num);
+ qemu_log_mask(LOG_GUEST_ERROR, "vmxnet3: Bad RX queues number: %d\n",
+ s->rxq_num);
+ return false;
}
+
+ return true;
}
static void vmxnet3_activate_device(VMXNET3State *s)
@@ -1419,6 +1425,16 @@ static void vmxnet3_activate_device(VMXNET3State *s)
return;
}
+ s->txq_num =
+ VMXNET3_READ_DRV_SHARED8(d, s->drv_shmem, devRead.misc.numTxQueues);
+ s->rxq_num =
+ VMXNET3_READ_DRV_SHARED8(d, s->drv_shmem, devRead.misc.numRxQueues);
+
+ VMW_CFPRN("Number of TX/RX queues %u/%u", s->txq_num, s->rxq_num);
+ if (!vmxnet3_validate_queues(s)) {
+ return;
+ }
+
vmxnet3_adjust_by_guest_type(s);
vmxnet3_update_features(s);
vmxnet3_update_pm_state(s);
@@ -1445,14 +1461,6 @@ static void vmxnet3_activate_device(VMXNET3State *s)
VMXNET3_READ_DRV_SHARED8(d, s->drv_shmem, devRead.intrConf.autoMask);
VMW_CFPRN("Automatic interrupt masking is %d", (int)s->auto_int_masking);
- s->txq_num =
- VMXNET3_READ_DRV_SHARED8(d, s->drv_shmem, devRead.misc.numTxQueues);
- s->rxq_num =
- VMXNET3_READ_DRV_SHARED8(d, s->drv_shmem, devRead.misc.numRxQueues);
-
- VMW_CFPRN("Number of TX/RX queues %u/%u", s->txq_num, s->rxq_num);
- vmxnet3_validate_queues(s);
-
qdescr_table_pa =
VMXNET3_READ_DRV_SHARED64(d, s->drv_shmem, devRead.misc.queueDescPA);
VMW_CFPRN("TX queues descriptors table is at 0x%" PRIx64, qdescr_table_pa);
@@ -2404,7 +2412,9 @@ static int vmxnet3_post_load(void *opaque, int version_id)
}
}
- vmxnet3_validate_queues(s);
+ if (!vmxnet3_validate_queues(s)) {
+ return -1;
+ }
vmxnet3_validate_interrupts(s);
return 0;
--
2.27.0
- [PATCH] hw/net/vmxnet3: Do not abort QEMU if guest specified bad queue numbers,
Thomas Huth <=