Change Details

vm_radix: add vm_radix_insert_prealloc() a non-failing variant of vm_radix_insert() that takes the preallocated pctrie node used for the insertion. The element to be inserted must not be present in the trie already. amd64 pmap: do not panic if a kernel pt cannot be inserted into pm_root trie dev/mem: use sx instead of rw lock Some ops require sleepable context to success, like DMAP demotion. amd64 pmap: preallocate pt page foir pmap_demote_pdpe() in pmap_demote_DMAP() Allocate the page outside the kernel_pmap locked region, and pass it to pmap_demote_pdpe() instead of panicing if VM_ALLOC_INTERRUPT failing.

amd64 pmap: do not panic on inability to insert ptp into trie When pmap_enter_pde() needs to destroy existing kernel superpage mapping, do not remove saved pt page from the pm_root trie. Then the pt page does not need to be re-inserted into the trie. If the kernel region is not mapped with the superpage, try to insert the pt page into pm_root trie before clearing ptes. If failed, we can return failure without a need to rewind. Suggested by: alc dev/mem: use sx instead of rw lock Some ops require sleepable context to success, like DMAP demotion. amd64 pmap: preallocate pt page foir pmap_demote_pdpe() in pmap_demote_DMAP() Allocate the page outside the kernel_pmap locked region, and pass it to pmap_demote_pdpe() instead of panicing if VM_ALLOC_INTERRUPT failing.

vm_radix: add vm_radix_amd64 pmap: do not panic on inability to insert_prealloc() ptp into trie a non-failing variant of vm_radix_insert() that takes the preallocatedWhen pmap_enter_pde() needs to destroy existing kernel superpage pctrie node used for the insertion.mapping, The element to be inserted must notdo not remove saved pt page from the pm_root trie. Then the be present in the trie alreadypt page does not need to be re-inserted into the trie. amd64 pmap: do not panic if a kernel pt cannot be inserted into pm_root trieIf the kernel region is not mapped with the superpage, try to insert the pt page into pm_root trie before clearing ptes. If failed, we can return failure without a need to rewind. Suggested by: alc dev/mem: use sx instead of rw lock Some ops require sleepable context to success, like DMAP demotion. amd64 pmap: preallocate pt page foir pmap_demote_pdpe() in pmap_demote_DMAP() Allocate the page outside the kernel_pmap locked region, and pass it to pmap_demote_pdpe() instead of panicing if VM_ALLOC_INTERRUPT failing.