[xen master] iommu/amd-vi: avoid pointless flushes in invalidate_all_domain_pages()

[patchbot@xxxxxxx]

commit fd62986f6b776876f3028a755c859d02e55dc262
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Mon Jul 10 12:19:25 2023 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jul 10 12:19:25 2023 +0200

    iommu/amd-vi: avoid pointless flushes in invalidate_all_domain_pages()
    
    Fix invalidate_all_domain_pages() to only attempt to flush the domains
    that have IOMMU enabled, otherwise the flush is pointless.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/drivers/passthrough/amd/iommu_init.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/drivers/passthrough/amd/iommu_init.c 
b/xen/drivers/passthrough/amd/iommu_init.c
index 7dbd7e7d09..af6713d2fc 100644
--- a/xen/drivers/passthrough/amd/iommu_init.c
+++ b/xen/drivers/passthrough/amd/iommu_init.c
@@ -1532,8 +1532,10 @@ int __init amd_iommu_init_late(void)
 static void invalidate_all_domain_pages(void)
 {
     struct domain *d;
+
     for_each_domain( d )
-        amd_iommu_flush_all_pages(d);
+        if ( is_iommu_enabled(d) )
+            amd_iommu_flush_all_pages(d);
 }
 
 static int cf_check _invalidate_all_devices(
--
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