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[PATCH v1 15/28] x86/hvm: vlapic: add checks before posted interrupt delivery
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: dmukhin@xxxxxxxx
- Date: Wed, 4 Nov 2026 17:33:32 -0800
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- Cc: andrew.cooper3@xxxxxxxxxx, jason.andryuk@xxxxxxx, jbeulich@xxxxxxxx, roger@xxxxxxxxxxxxxx, teddy.astie@xxxxxxxxxx, dmukhin@xxxxxxx, Denis Mukhin <dmukhin@xxxxxxxx>
- Delivery-date: Thu, 05 Nov 2026 01:34:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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From: Denis Mukhin <dmukhin@xxxxxxxx>
Hoist IRR check for pending vector in question to avoid calling into
posted interrupt delivery callback.
Also, avoid calling posted interrupts when current vCPU is target vCPU.
Signed-off-by: Denis Mukhin <dmukhin@xxxxxxxx>
---
xen/arch/x86/hvm/vlapic.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/xen/arch/x86/hvm/vlapic.c b/xen/arch/x86/hvm/vlapic.c
index 22c472d569b5..222a78b02b77 100644
--- a/xen/arch/x86/hvm/vlapic.c
+++ b/xen/arch/x86/hvm/vlapic.c
@@ -164,9 +164,17 @@ void vlapic_set_irq(struct vlapic *vlapic, uint8_t vec,
uint8_t trig)
if ( hvm_funcs.update_eoi_exit_bitmap )
alternative_vcall(hvm_funcs.update_eoi_exit_bitmap, target, vec, trig);
+ if ( vlapic_test_and_set_irr(vlapic, vec) )
+ /* Interrupt vector is already pending */
+ return;
+
+ if ( target == current )
+ /* Kick remote vCPUs only */
+ return;
+
if ( hvm_funcs.deliver_posted_intr )
alternative_vcall(hvm_funcs.deliver_posted_intr, target, vec);
- else if ( !vlapic_test_and_set_irr(vlapic, vec) )
+ else
vcpu_kick(target);
}
--
2.55.0
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