[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] x86/iommu: add comment regarding setting of need_sync
Clarify why relaxed hardware domains don't need iommu page-table syncing. Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx> --- Cc: Jan Beulich <jbeulich@xxxxxxxx> --- xen/drivers/passthrough/iommu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c index 79ec6719f5..f8c3bf53bd 100644 --- a/xen/drivers/passthrough/iommu.c +++ b/xen/drivers/passthrough/iommu.c @@ -185,6 +185,10 @@ void __hwdom_init iommu_hwdom_init(struct domain *d) register_keyhandler('o', &iommu_dump_p2m_table, "dump iommu p2m table", 0); hd->status = IOMMU_STATUS_initializing; + /* + * NB: relaxed hw domains don't need sync because all ram is already + * mapped in the iommu page tables. + */ hd->need_sync = iommu_hwdom_strict && !iommu_use_hap_pt(d); if ( need_iommu_pt_sync(d) ) { -- 2.20.1 (Apple Git-117) _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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