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[PATCH v8 20/26] emul/ns16x50: resolve physical IRQ sharing
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: dmukhin@xxxxxxxx
- Date: Wed, 11 Nov 2026 11:47:54 -0800
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- Cc: andrew.cooper3@xxxxxxxxxx, anthony.perard@xxxxxxxxxx, jbeulich@xxxxxxxx, julien@xxxxxxx, michal.orzel@xxxxxxx, roger@xxxxxxxxxxxxxx, sstabellini@xxxxxxxxxx, xakep.amatop@xxxxxxxxx, dmukhin@xxxxxxx, Denis Mukhin <dmukhin@xxxxxxxx>
- Delivery-date: Wed, 11 Nov 2026 19:49:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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From: Denis Mukhin <dmukhin@xxxxxxxx>
Make sure that NS16550 emulator does not share virtual device IRQ with
the physical one. This is needed for enabling NS16550 emulator for PVH
hwdom (dom0).
Signed-off-by: Denis Mukhin <dmukhin@xxxxxxxx>
---
xen/common/emul/vuart/ns16x50.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/xen/common/emul/vuart/ns16x50.c b/xen/common/emul/vuart/ns16x50.c
index 97e12a99368a..389c58f94198 100644
--- a/xen/common/emul/vuart/ns16x50.c
+++ b/xen/common/emul/vuart/ns16x50.c
@@ -931,6 +931,17 @@ static int ns16x50_init(void *arg)
else
ASSERT_UNREACHABLE();
+ /*
+ * Disallow sharing physical IRQ.
+ */
+ rc = irq_deny_access(d, info->irq);
+ if ( rc )
+ {
+ ns16x50_err(info, "virtual IRQ#%d: conflict w/ physical IRQ: %d\n",
+ info->irq, rc);
+ return rc;
+ }
+
ns16x50_reset(vdev);
ns16x50_irq_check(vdev);
--
2.56.0
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