8bebdbe494
pmap_growkernel() may be called when mapping a region above KERNBASE,
typically for a kernel module. If we have enough PTPs left over from
bootstrap, pmap_growkernel() does nothing. However, it's possible to
run out, and in this case pmap_growkernel() will try to grow the kernel
map all the way from kernel_vm_end to somewhere past KERNBASE, which can
easily run the system out of memory. This happens with large kernel
modules such as the nvidia GPU driver. There is also a WIP dtrace
provider which needs to map KVA in the region above KERNBASE (to provide
trampolines which allow a copy of traced kernel instruction to be
executed), and its allocations could potentially trigger this scenario.
This change modifies pmap_growkernel() to manage the two regions
separately, allowing them to grow independently. The end of the
KERNBASE region is tracked by modifying "nkpt".
PR: 265019
Reviewed by: alc, imp, kib
(cherry picked from commit
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| .github/workflows | ||
| bin | ||
| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| stand | ||
| sys | ||
| targets | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| .arcconfig | ||
| .arclint | ||
| .cirrus.yml | ||
| .clang-format | ||
| .gitattributes | ||
| .gitignore | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.libcompat | ||
| Makefile.sys.inc | ||
| ObsoleteFiles.inc | ||
| README | ||
| README.md | ||
| RELNOTES | ||
| UPDATING | ||
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