[xen staging] x86/msi: always propagate MSI register writes from __setup_msi_irq()

[patchbot@xxxxxxx]

commit b3bf9646101e48d9c3a8a53e53c39a39b4aa877f
Author:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
AuthorDate: Tue Mar 18 09:31:35 2025 +0100
Commit:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
CommitDate: Thu Mar 20 09:27:25 2025 +0100

    x86/msi: always propagate MSI register writes from __setup_msi_irq()
    
    After 8e60d47cf011 writes from __setup_msi_irq() will no longer be
    propagated to the MSI registers if the IOMMU IRTE was already allocated.
    Given the purpose of __setup_msi_irq() is MSI initialization, always
    propagate the write to the hardware, regardless of whether the IRTE was
    already allocated.
    
    No functional change expected, as the write should always be propagated in
    __setup_msi_irq(), but make it explicit on the write_msi_msg() call.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/msi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/msi.c b/xen/arch/x86/msi.c
index 8bb3bb18af..5389bc0867 100644
--- a/xen/arch/x86/msi.c
+++ b/xen/arch/x86/msi.c
@@ -532,7 +532,7 @@ int __setup_msi_irq(struct irq_desc *desc, struct msi_desc 
*msidesc,
     desc->msi_desc = msidesc;
     desc->handler = handler;
     msi_compose_msg(desc->arch.vector, desc->arch.cpu_mask, &msg);
-    ret = write_msi_msg(msidesc, &msg, false);
+    ret = write_msi_msg(msidesc, &msg, true);
     if ( unlikely(ret) )
     {
         desc->handler = &no_irq_type;
--
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