On Fri, 20 Dec 2013, Neel Natu wrote:
Hi Ben,
On Fri, Dec 20, 2013 at 10:27 AM, Benjamin Kaduk <[email protected]> wrote:
On Thu, Dec 19, 2013 at 9:50 PM, Neel Natu <[email protected]> wrote:
Author: neel
Date: Fri Dec 20 05:50:22 2013
New Revision: 259641
URL: http://svnweb.freebsd.org/changeset/base/259641
Log:
Re-arrange bits in the amd64/pmap 'pm_flags' field.
The least significant 8 bits of 'pm_flags' are now used for the IPI
vector
to use for nested page table TLB shootdown.
Previously we used IPI_AST to interrupt the host cpu which is
functionally
correct but could lead to misleading interrupt counts for AST handler.
The
AST handler was also doing a lot more than what is required for the
nested
page table TLB shootdown (EOI and IRET).
This represents a KBI change, does it not? Should __FreeBSD_version be
bumped?
I was under the impression that a bump would be required only if this
change is MFCed to a stable branch. I could be wrong about this and if
so would be happy to rectify it.
I guess KBI is probably okay, that's true. I have had a lot of headaches
with KPI changes on -current and third-party modules, so I am a bit
sensitive. I'm also recovering from a laptop theft while on vacation, and
thus a bit discombobulated.
Thanks,
Ben
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