Commit 0e11df96 authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Michael Ellerman
Browse files

powerpc/kvm/book3s: Use pte_present instead of opencoding _PAGE_PRESENT check 



This adds _PAGE_PTE check and makes sure we validate the pte value returned via
find_kvm_host_pte.

NOTE: this also considers _PAGE_INVALID to the software valid bit.

Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200505071729.54912-20-aneesh.kumar@linux.ibm.com
parent 9fd4236f

arch/powerpc/include/asm/kvm_book3s_64.h

+1 −1
Original line number Diff line number Diff line
@@ -435,7 +435,7 @@ static inline pte_t kvmppc_read_update_linux_pte(pte_t *ptep, int writing) 
			continue;

		}

		/* If pte is not present return None */

		if (unlikely(!(pte_val(old_pte) & _PAGE_PRESENT)))

		if (unlikely(!pte_present(old_pte)))

			return __pte(0);



		new_pte = pte_mkyoung(old_pte);