This is a note to let you know that I've just added the patch titled iommu/amd: Set DTE[IntTabLen] to represent 512 IRTEs to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: iommu-amd-set-dte-to-represent-512-irtes.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 4165bf015ba9454f45beaad621d16c516d5c5afe Mon Sep 17 00:00:00 2001 From: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx> Date: Mon, 7 Dec 2020 03:19:20 -0600 Subject: iommu/amd: Set DTE[IntTabLen] to represent 512 IRTEs From: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx> commit 4165bf015ba9454f45beaad621d16c516d5c5afe upstream. According to the AMD IOMMU spec, the commit 73db2fc595f3 ("iommu/amd: Increase interrupt remapping table limit to 512 entries") also requires the interrupt table length (IntTabLen) to be set to 9 (power of 2) in the device table mapping entry (DTE). Fixes: 73db2fc595f3 ("iommu/amd: Increase interrupt remapping table limit to 512 entries") Reported-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx> Reviewed-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx> Link: https://lore.kernel.org/r/20201207091920.3052-1-suravee.suthikulpanit@xxxxxxx Signed-off-by: Will Deacon <will@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/iommu/amd_iommu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -3661,7 +3661,7 @@ static struct irq_chip amd_ir_chip; #define DTE_IRQ_PHYS_ADDR_MASK (((1ULL << 45)-1) << 6) #define DTE_IRQ_REMAP_INTCTL (2ULL << 60) -#define DTE_IRQ_TABLE_LEN (8ULL << 1) +#define DTE_IRQ_TABLE_LEN (9ULL << 1) #define DTE_IRQ_REMAP_ENABLE 1ULL static void set_dte_irq_entry(u16 devid, struct irq_remap_table *table) Patches currently in stable-queue which might be from suravee.suthikulpanit@xxxxxxx are queue-4.9/iommu-amd-set-dte-to-represent-512-irtes.patch