Re: [PATCH] pci: Add a acs_disable option for pci kernel parameter

2017-10-29 Thread Stephen Bates
>> This patch adds a new boot option to the pci kernel parameter called >> "acs_disable" that will disable ACS. This is useful for PCI peer to >> peer communication but can cause problems when IOVA isolation is >> required and an IOMMU is enabled. Use with care. > Eww. Thanks for the feedback

Re: [PATCH] pci: Add a acs_disable option for pci kernel parameter

2017-10-29 Thread Stephen Bates
>> This patch adds a new boot option to the pci kernel parameter called >> "acs_disable" that will disable ACS. This is useful for PCI peer to >> peer communication but can cause problems when IOVA isolation is >> required and an IOMMU is enabled. Use with care. > Eww. Thanks for the feedback

Re: [PATCH] pci: Add a acs_disable option for pci kernel parameter

2017-10-27 Thread Christoph Hellwig
On Thu, Oct 26, 2017 at 08:37:49PM -0600, sba...@raithlin.com wrote: > From: Stephen Bates > > On some servers the BIOS sets up ACS on any valid pci_dev in the > system. The kernel has no way of backing this out since the kernel > only turns ACS capabilities on. > > This

Re: [PATCH] pci: Add a acs_disable option for pci kernel parameter

2017-10-27 Thread Christoph Hellwig
On Thu, Oct 26, 2017 at 08:37:49PM -0600, sba...@raithlin.com wrote: > From: Stephen Bates > > On some servers the BIOS sets up ACS on any valid pci_dev in the > system. The kernel has no way of backing this out since the kernel > only turns ACS capabilities on. > > This patch adds a new boot

[PATCH] pci: Add a acs_disable option for pci kernel parameter

2017-10-26 Thread sbates
From: Stephen Bates On some servers the BIOS sets up ACS on any valid pci_dev in the system. The kernel has no way of backing this out since the kernel only turns ACS capabilities on. This patch adds a new boot option to the pci kernel parameter called "acs_disable" that

[PATCH] pci: Add a acs_disable option for pci kernel parameter

2017-10-26 Thread sbates
From: Stephen Bates On some servers the BIOS sets up ACS on any valid pci_dev in the system. The kernel has no way of backing this out since the kernel only turns ACS capabilities on. This patch adds a new boot option to the pci kernel parameter called "acs_disable" that will disable ACS. This