From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
To: npiggin@gmail.com, paulus@samba.org, mpe@ellerman.id.au,
kirill@shutemov.name
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Subject: [RFC PATCH 20/21] powerpc/kvm/book3s: Use pte_present instead of opencoding _PAGE_PRESENT check
Date: Thu, 27 Feb 2020 12:26:19 +0530 [thread overview]
Message-ID: <20200227065620.50804-21-aneesh.kumar@linux.ibm.com> (raw)
In-Reply-To: <20200227065620.50804-1-aneesh.kumar@linux.ibm.com>
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>
---
arch/powerpc/include/asm/kvm_book3s_64.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h
index 1ca1f6495012..c58e64a0a74f 100644
--- a/arch/powerpc/include/asm/kvm_book3s_64.h
+++ b/arch/powerpc/include/asm/kvm_book3s_64.h
@@ -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);
--
2.24.1
next prev parent reply other threads:[~2020-02-27 7:36 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-27 6:55 [RFC PATCH 00/21] Avoid IPI while updating page table entries Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 01/21] powerpc/pkeys: Avoid using lockless page table walk Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 02/21] powerpc/pkeys: Check vma before returning key fault error to the user Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 03/21] powerpc/mm/hash64: use _PAGE_PTE when checking for pte_present Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 04/21] powerpc/hash64: Restrict page table lookup using init_mm with __flush_hash_table_range Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 05/21] powerpc/book3s64/hash: Use the pte_t address from the caller Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 06/21] powerpc/book3s/hash64/devmap: Use H_PAGE_THP_HUGE when setting up level huge devmap pte entries Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 07/21] powerpc/mce: Don't reload pte val in addr_to_pfn Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 08/21] powerpc/perf/callchain: Use __get_user_pages_fast in read_user_stack_slow Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 09/21] powerpc/kvm/book3s: switch from raw_spin_*lock to arch_spin_lock Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 10/21] powerpc/kvm/book3s: Add helper to walk partition scoped linux page table Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 11/21] powerpc/kvm/nested: Add helper to walk nested shadow " Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 12/21] powerpc/kvm/book3s: Use kvm helpers to walk shadow or secondary table Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 13/21] powerpc/kvm/book3s: Add helper for host page table walk Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 14/21] powerpc/kvm/book3s: Use find_kvm_host_pte in page fault handler Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 15/21] powerpc/kvm/book3s: Use find_kvm_host_pte in h_enter Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 16/21] powerpc/kvm/book3s: use find_kvm_host_pte in pute_tce functions Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 17/21] powerpc/kvm/book3s: Avoid using rmap to protect parallel page table update Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 18/21] powerpc/kvm/book3s: use find_kvm_host_pte in kvmppc_book3s_instantiate_page Aneesh Kumar K.V
2020-02-27 6:56 ` [RFC PATCH 19/21] powerpc/kvm/book3s: Use find_kvm_host_pte in kvmppc_get_hpa Aneesh Kumar K.V
2020-02-27 6:56 ` Aneesh Kumar K.V [this message]
2020-02-27 6:56 ` [RFC PATCH 21/21] powerpc/mm/book3s64: Avoid sending IPI on clearing PMD Aneesh Kumar K.V
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