linux-kernel - [PATCH 3.14 40/51] ARM: KVM: introduce kvm_p*d_addr

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Date:	Fri, 15 May 2015 16:10:42 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Marc Zyngier <marc.zyngier@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Shannon Zhao <shannon.zhao@...aro.org>
Subject: [PATCH 3.14 40/51] ARM: KVM: introduce kvm_p*d_addr_end

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marc Zyngier <marc.zyngier@....com>

commit a3c8bd31af260a17d626514f636849ee1cd1f63e upstream.

The use of p*d_addr_end with stage-2 translation is slightly dodgy,
as the IPA is 40bits, while all the p*d_addr_end helpers are
taking an unsigned long (arm64 is fine with that as unligned long
is 64bit).

The fix is to introduce 64bit clean versions of the same helpers,
and use them in the stage-2 page table code.

Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Acked-by: Catalin Marinas <catalin.marinas@....com>
Reviewed-by: Christoffer Dall <christoffer.dall@...aro.org>
Cc: Shannon Zhao <shannon.zhao@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/include/asm/kvm_mmu.h   |   13 +++++++++++++
 arch/arm/kvm/mmu.c               |   10 +++++-----
 arch/arm64/include/asm/kvm_mmu.h |    4 ++++
 3 files changed, 22 insertions(+), 5 deletions(-)

--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -114,6 +114,19 @@ static inline void kvm_set_s2pmd_writabl
 	pmd_val(*pmd) |= L_PMD_S2_RDWR;
 }
 
+/* Open coded p*d_addr_end that can deal with 64bit addresses */
+#define kvm_pgd_addr_end(addr, end)					\
+({	u64 __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK;		\
+	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
+})
+
+#define kvm_pud_addr_end(addr,end)		(end)
+
+#define kvm_pmd_addr_end(addr, end)					\
+({	u64 __boundary = ((addr) + PMD_SIZE) & PMD_MASK;		\
+	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
+})
+
 struct kvm;
 
 static inline void coherent_cache_guest_page(struct kvm_vcpu *vcpu, hva_t hva,
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -147,7 +147,7 @@ static void unmap_range(struct kvm *kvm,
 		pgd = pgdp + pgd_index(addr);
 		pud = pud_offset(pgd, addr);
 		if (pud_none(*pud)) {
-			addr = pud_addr_end(addr, end);
+			addr = kvm_pud_addr_end(addr, end);
 			continue;
 		}
 
@@ -157,13 +157,13 @@ static void unmap_range(struct kvm *kvm,
 			 * move on.
 			 */
 			clear_pud_entry(kvm, pud, addr);
-			addr = pud_addr_end(addr, end);
+			addr = kvm_pud_addr_end(addr, end);
 			continue;
 		}
 
 		pmd = pmd_offset(pud, addr);
 		if (pmd_none(*pmd)) {
-			addr = pmd_addr_end(addr, end);
+			addr = kvm_pmd_addr_end(addr, end);
 			continue;
 		}
 
@@ -178,10 +178,10 @@ static void unmap_range(struct kvm *kvm,
 		 */
 		if (kvm_pmd_huge(*pmd) || page_empty(pte)) {
 			clear_pmd_entry(kvm, pmd, addr);
-			next = pmd_addr_end(addr, end);
+			next = kvm_pmd_addr_end(addr, end);
 			if (page_empty(pmd) && !page_empty(pud)) {
 				clear_pud_entry(kvm, pud, addr);
-				next = pud_addr_end(addr, end);
+				next = kvm_pud_addr_end(addr, end);
 			}
 		}
 
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -121,6 +121,10 @@ static inline void kvm_set_s2pmd_writabl
 	pmd_val(*pmd) |= PMD_S2_RDWR;
 }
 
+#define kvm_pgd_addr_end(addr, end)	pgd_addr_end(addr, end)
+#define kvm_pud_addr_end(addr, end)	pud_addr_end(addr, end)
+#define kvm_pmd_addr_end(addr, end)	pmd_addr_end(addr, end)
+
 struct kvm;
 
 #define kvm_flush_dcache_to_poc(a,l)	__flush_dcache_area((a), (l))


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