Searched hist:"8 ec533d336b912e024b070990a3dd230b55a9dbf" (Results 1 – 2 of 2) sorted by relevance
| /freebsd/sys/vm/ |
| H A D | vm.h | diff 8ec533d336b912e024b070990a3dd230b55a9dbf Mon Mar 26 18:31:12 CEST 2018 Konstantin Belousov <kib@FreeBSD.org> Allow to specify for vm_fault_quick_hold_pages() that nofault mode
should be honored.
We must not sleep or acquire any MI VM locks if TDP_NOFAULTING is
specified. On the other hand, there were some callers in the tree
which set TDP_NOFAULTING for larger scope than needed, I fixed the
code which I wrote, but I suspect that linuxkpi and out of tree drm
drivers might abuse this still.
So only enable the mode for vm_fault_quick_hold_pages() where
vm_fault_hold() is not called when specifically asked by user. I
decided to use vm_prot_t flag to not change KPI. Since number of
flags in vm_prot_t is limited, I reused the same flag which was
already consumed for vm_map_lookup().
Reported and tested by: pho (as part of the larger patch)
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D14825
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| H A D | vm_fault.c | diff 8ec533d336b912e024b070990a3dd230b55a9dbf Mon Mar 26 18:31:12 CEST 2018 Konstantin Belousov <kib@FreeBSD.org> Allow to specify for vm_fault_quick_hold_pages() that nofault mode
should be honored.
We must not sleep or acquire any MI VM locks if TDP_NOFAULTING is
specified. On the other hand, there were some callers in the tree
which set TDP_NOFAULTING for larger scope than needed, I fixed the
code which I wrote, but I suspect that linuxkpi and out of tree drm
drivers might abuse this still.
So only enable the mode for vm_fault_quick_hold_pages() where
vm_fault_hold() is not called when specifically asked by user. I
decided to use vm_prot_t flag to not change KPI. Since number of
flags in vm_prot_t is limited, I reused the same flag which was
already consumed for vm_map_lookup().
Reported and tested by: pho (as part of the larger patch)
Reviewed by: markj
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D14825
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