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change update_range to handle > 4GB 2nd stage range for ARMv7

PATCH Superseded Mario Smarduch 2 participants 3 messages Apr 29, 2014 – May 6, 2014 1 message not in the archive

Subsystems (2)
Arm (32-bit) KVM

v4 of 11 Superseded Latest is v11 →

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Mario Smarduch

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#1 lore raw

PATCH v4 5/5 change update_range to handle > 4GB 2nd stage range for ARMv7

In reply to a message not in the archive

This patch adds support for unmapping 2nd stage page tables for addresses >4GB on ARMv7.

Signed-off-by Mario Smarduch <[email protected]>
---
 arch/arm/kvm/mmu.c |   20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)
arch/arm/kvm/mmu.c +12 -8
index 88f5503..afbf8ba 100644
@@ -176,21 +176,25 @@ static void clear_pte_entry(struct kvm *kvm, pte_t *pte, phys_addr_t addr)
 	}
 }
 
+/* Function shared between identity and 2nd stage mappings. For 2nd stage
+ * the IPA may be > 4GB on ARMv7, and page table range functions
+ * will fail. kvm_xxx_addr_end() is used to handle both cases.
+ */
 static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
-			unsigned long long start, u64 size)
+			phys_addr_t start, u64 size)
 {
 	pgd_t *pgd;
 	pud_t *pud;
 	pmd_t *pmd;
 	pte_t *pte;
-	unsigned long long addr = start, end = start + size;
-	u64 next;
+	phys_addr_t addr = start, end = start + size;
+	phys_addr_t next;
 
 	while (addr < end) {
 		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;
 		}
 

@@ -200,13 +204,13 @@ static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
 			 * 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;
 		}
 

@@ -221,10 +225,10 @@ static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
 		 */
 		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);
 			}
 		}
Signature · 1 line
1.7.9.5
Acked-by Catalin Marinas Reviewed-by Christoffer Dall on v4 5/5
#2 lore raw

Hi Mario,

Quoted 73 lines · Mario Smarduch

This patch adds support for unmapping 2nd stage page tables for addresses >4GB on ARMv7.

Signed-off-by Mario Smarduch <[email protected]>
---
 arch/arm/kvm/mmu.c |   20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)
arch/arm/kvm/mmu.c +12 -9
index 88f5503..afbf8ba 100644
@@ -176,21 +176,25 @@ static void clear_pte_entry(struct kvm *kvm, pte_t *pte, phys_addr_t addr)
        }
 }
 
+/* Function shared between identity and 2nd stage mappings. For 2nd stage
+ * the IPA may be > 4GB on ARMv7, and page table range functions
+ * will fail. kvm_xxx_addr_end() is used to handle both cases.
+ */
 static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
-                       unsigned long long start, u64 size)
+                       phys_addr_t start, u64 size)
 {
        pgd_t *pgd;
        pud_t *pud;
        pmd_t *pmd;
        pte_t *pte;
-       unsigned long long addr = start, end = start + size;
-       u64 next;
+       phys_addr_t addr = start, end = start + size;
+       phys_addr_t next;
 
        while (addr < end) {
                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;
                }
 

@@ -200,13 +204,13 @@ static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
                         * 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;
                }
 

@@ -221,10 +225,10 @@ static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
                 */
                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);
                        }
                }
 
--
Quoted 4 lines

1.7.9.5

It seems that your adding kvm_pmd_addr_end(addr, end) already exists in the following patch and may need to remove these parts from your patch.

commit a3c8bd31af260a17d626514f636849ee1cd1f63e

Author: Marc Zyngier <[email protected]>
Date:   Tue Feb 18 14:29:03 2014 +0000

ARM: KVM: introduce kvm_p*d_addr_end

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 <[email protected]>
Acked-by Catalin Marinas <[email protected]>
Reviewed-by Christoffer Dall <[email protected]>

Gavin

author
#3 lore raw

Hi Gavin,
thanks, didn't catch that, I'll remove these calls.

- Mario

Quoted 105 lines · Gavin Guo

Hi Mario,

Quoted 73 lines · Mario Smarduch

This patch adds support for unmapping 2nd stage page tables for addresses >4GB on ARMv7.

Signed-off-by Mario Smarduch <[email protected]>
---
 arch/arm/kvm/mmu.c |   20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)
arch/arm/kvm/mmu.c +12 -9
index 88f5503..afbf8ba 100644
@@ -176,21 +176,25 @@ static void clear_pte_entry(struct kvm *kvm, pte_t *pte, phys_addr_t addr)
        }
 }
 
+/* Function shared between identity and 2nd stage mappings. For 2nd stage
+ * the IPA may be > 4GB on ARMv7, and page table range functions
+ * will fail. kvm_xxx_addr_end() is used to handle both cases.
+ */
 static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
-                       unsigned long long start, u64 size)
+                       phys_addr_t start, u64 size)
 {
        pgd_t *pgd;
        pud_t *pud;
        pmd_t *pmd;
        pte_t *pte;
-       unsigned long long addr = start, end = start + size;
-       u64 next;
+       phys_addr_t addr = start, end = start + size;
+       phys_addr_t next;
 
        while (addr < end) {
                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;
                }
 

@@ -200,13 +204,13 @@ static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
                         * 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;
                }
 

@@ -221,10 +225,10 @@ static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
                 */
                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);
                        }
                }
 
--
Quoted 4 lines

1.7.9.5

It seems that your adding kvm_pmd_addr_end(addr, end) already exists in the following patch and may need to remove these parts from your patch.

commit a3c8bd31af260a17d626514f636849ee1cd1f63e

Author: Marc Zyngier <[email protected]>
Date:   Tue Feb 18 14:29:03 2014 +0000

ARM: KVM: introduce kvm_p*d_addr_end

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 <[email protected]>
Acked-by Catalin Marinas <[email protected]>
Reviewed-by Christoffer Dall <[email protected]>

Gavin