This is a note to let you know that I've just added the patch titled xen/pciback: Save the number of MSI-X entries to be copied later. to the 4.4-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: xen-pciback-save-the-number-of-msi-x-entries-to-be-copied-later.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From d159457b84395927b5a52adb72f748dd089ad5e5 Mon Sep 17 00:00:00 2001 From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> Date: Thu, 11 Feb 2016 16:10:24 -0500 Subject: xen/pciback: Save the number of MSI-X entries to be copied later. From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> commit d159457b84395927b5a52adb72f748dd089ad5e5 upstream. Commit 8135cf8b092723dbfcc611fe6fdcb3a36c9951c5 (xen/pciback: Save xen_pci_op commands before processing it) broke enabling MSI-X because it would never copy the resulting vectors into the response. The number of vectors requested was being overwritten by the return value (typically zero for success). Save the number of vectors before processing the op, so the correct number of vectors are copied afterwards. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/xen/xen-pciback/pciback_ops.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/xen/xen-pciback/pciback_ops.c +++ b/drivers/xen/xen-pciback/pciback_ops.c @@ -333,6 +333,9 @@ void xen_pcibk_do_op(struct work_struct struct xen_pcibk_dev_data *dev_data = NULL; struct xen_pci_op *op = &pdev->op; int test_intx = 0; +#ifdef CONFIG_PCI_MSI + unsigned int nr = 0; +#endif *op = pdev->sh_info->op; barrier(); @@ -361,6 +364,7 @@ void xen_pcibk_do_op(struct work_struct op->err = xen_pcibk_disable_msi(pdev, dev, op); break; case XEN_PCI_OP_enable_msix: + nr = op->value; op->err = xen_pcibk_enable_msix(pdev, dev, op); break; case XEN_PCI_OP_disable_msix: @@ -383,7 +387,7 @@ void xen_pcibk_do_op(struct work_struct if (op->cmd == XEN_PCI_OP_enable_msix && op->err == 0) { unsigned int i; - for (i = 0; i < op->value; i++) + for (i = 0; i < nr; i++) pdev->sh_info->op.msix_entries[i].vector = op->msix_entries[i].vector; } Patches currently in stable-queue which might be from konrad.wilk@xxxxxxxxxx are queue-4.4/xen-pciback-save-the-number-of-msi-x-entries-to-be-copied-later.patch queue-4.4/xen-pciback-check-pf-instead-of-vf-for-pci_command_memory.patch queue-4.4/xen-pcifront-fix-mysterious-crashes-when-numa-locality-information-was-extracted.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html