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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: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200505071729.54912-20-aneesh.kumar@linux.ibm.com
This commit is contained in:
Aneesh Kumar K.V 2020-05-05 12:47:26 +05:30 committed by Michael Ellerman
parent 9fd4236faa
commit 0e11df9649
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/include/asm/kvm_book3s_64.h
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@ -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);