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commit 80b83a3c94e55a23f647dd3c92b522d77959bdc0
Author: Xenia Ragiadakou <burzalodowa@gmail.com>
AuthorDate: Mon Feb 13 16:26:43 2023 +0100
Commit: Jan Beulich <jbeulich@suse.com>
CommitDate: Mon Feb 13 16:26:43 2023 +0100

x86/iommu: snoop control is allowed only by Intel VT-d

The AMD-Vi driver forces coherent accesses by hardwiring the FC bit to 1.
Therefore, given that iommu_snoop is used only when the iommu is enabled,
when Xen is configured with only the AMD iommu enabled, iommu_snoop can be
reduced to a #define to true.

No functional change intended.

Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---
xen/include/xen/iommu.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h
index 4f22fc1bed..626731941b 100644
--- a/xen/include/xen/iommu.h
+++ b/xen/include/xen/iommu.h
@@ -74,7 +74,12 @@ extern enum __packed iommu_intremap {
iommu_intremap_restricted,
iommu_intremap_full,
} iommu_intremap;
-extern bool iommu_igfx, iommu_qinval, iommu_snoop;
+extern bool iommu_igfx, iommu_qinval;
+#ifdef CONFIG_INTEL_IOMMU
+extern bool iommu_snoop;
+#else
+# define iommu_snoop true
+#endif /* CONFIG_INTEL_IOMMU */
#else
# define iommu_intremap false
# define iommu_snoop false
--
generated by git-patchbot for /home/xen/git/xen.git#master