PowerISA v3.0 CPUs expect _PAGE_PRESENT to be at 0x8000_0000_0000_0000 instead of 0x2 and _PAGE_PTE to be at 0x4000_0000_0000_0000 instead of 0x1 in radix mode. These requirements are accomodated by changing the flags _PAGE_PRESENT & _PAGE_PTE for 64-bit POWER server processors with kernel commits 849f86a6 & 84c95756. This patch makes the corresponding changes here.
Signed-off-by: Hari Bathini <[email protected]> --- ppc64.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/ppc64.c b/ppc64.c index 6b89eaa..8733d64 100644 --- a/ppc64.c +++ b/ppc64.c @@ -317,6 +317,16 @@ ppc64_init(int when) m->_page_rw = 0x8UL; m->_page_guarded = 0x10UL; } + + /* + * Starting with kernel v4.6, to accommodate both + * radix and hash MMU modes in a single kernel, + * _PAGE_PTE & _PAGE_PRESENT page flags are changed. + */ + if (THIS_KERNEL_VERSION >= LINUX(4,6,0)) { + m->_page_pte = 0x1UL << 62; + m->_page_present = 0x1UL << 63; + } } if (!(machdep->flags & (VM_ORIG|VM_4_LEVEL))) { @@ -1336,7 +1346,7 @@ ppc64_translate_pte(ulong pte, void *physaddr, ulonglong pte_rpn_shift) ulong paddr; paddr = PTOB(pte >> pte_rpn_shift); - page_present = (pte & _PAGE_PRESENT); + page_present = !!(pte & _PAGE_PRESENT); if (physaddr) { *((ulong *)physaddr) = paddr; -- Crash-utility mailing list [email protected] https://www.redhat.com/mailman/listinfo/crash-utility
