===============
commit 4f853a714bf16338ff5261128e6c7ae2569e9505 upstream.
unmap_range() was utterly broken, to quote Marc, and broke in all sorts
of situations. It was also quite complicated to follow and didn't
follow the usual scheme of having a separate iterating function for each
level of page tables.
Address this by refactoring the code and introduce a pgd_clear()
function.
Reviewed-by: Jungseok Lee <jays.lee@samsung.com>
Reviewed-by: Mario Smarduch <m.smarduch@samsung.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
arch/arm/include/asm/kvm_mmu.h | 11 ++++
arch/arm/kvm/mmu.c | 106 +++++++++++++++++++++++----------------
arch/arm64/include/asm/kvm_mmu.h | 14 ++++++
3 files changed, 89 insertions(+), 42 deletions(-)
@@ -116,6 +116,17 @@ static inline void kvm_set_s2pte_writable(pte_t *pte)
(__boundary - 1 < (end) - 1)? __boundary: (end); \
})
+static inline bool kvm_page_empty(void *ptr)
+{
+ struct page *ptr_page = virt_to_page(ptr);
+ return page_count(ptr_page) == 1;
+}
+
+
+#define kvm_pte_table_empty(ptep) kvm_page_empty(ptep)
+#define kvm_pmd_table_empty(pmdp) kvm_page_empty(pmdp)
+#define kvm_pud_table_empty(pudp) (0)
+
struct kvm;
#define kvm_flush_dcache_to_poc(a,l) __cpuc_flush_dcache_area((a), (l))
@@ -87,10 +87,13 @@ static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc)
return p;
}
-static bool page_empty(void *ptr)
+static void clear_pgd_entry(struct kvm *kvm, pgd_t *pgd, phys_addr_t addr)
{
- struct page *ptr_page = virt_to_page(ptr);
- return page_count(ptr_page) == 1;
+ pud_t *pud_table __maybe_unused = pud_offset(pgd, 0);
+ pgd_clear(pgd);
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
+ pud_free(NULL, pud_table);
+ put_page(virt_to_page(pgd));
}
static void clear_pud_entry(struct kvm *kvm, pud_t *pud, phys_addr_t addr)
@@ -111,55 +114,74 @@ static void clear_pmd_entry(struct kvm *kvm, pmd_t *pmd, phys_addr_t addr)
put_page(virt_to_page(pmd));
}
-static void clear_pte_entry(struct kvm *kvm, pte_t *pte, phys_addr_t addr)
+static void unmap_ptes(struct kvm *kvm, pmd_t *pmd,
+ phys_addr_t addr, phys_addr_t end)
{
- if (pte_present(*pte)) {
- kvm_set_pte(pte, __pte(0));
- put_page(virt_to_page(pte));
- kvm_tlb_flush_vmid_ipa(kvm, addr);
- }
+ phys_addr_t start_addr = addr;
+ pte_t *pte, *start_pte;
+
+ start_pte = pte = pte_offset_kernel(pmd, addr);
+ do {
+ if (!pte_none(*pte)) {
+ kvm_set_pte(pte, __pte(0));
+ put_page(virt_to_page(pte));
+ kvm_tlb_flush_vmid_ipa(kvm, addr);
+ }
+ } while (pte++, addr += PAGE_SIZE, addr != end);
+
+ if (kvm_pte_table_empty(start_pte))
+ clear_pmd_entry(kvm, pmd, start_addr);
}
-static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
- unsigned long long start, u64 size)
+static void unmap_pmds(struct kvm *kvm, pud_t *pud,
+ phys_addr_t addr, phys_addr_t end)
{
- 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 next, start_addr = addr;
+ pmd_t *pmd, *start_pmd;
- while (addr < end) {
- pgd = pgdp + pgd_index(addr);
- pud = pud_offset(pgd, addr);
- if (pud_none(*pud)) {
- addr = kvm_pud_addr_end(addr, end);
- continue;
+ start_pmd = pmd = pmd_offset(pud, addr);
+ do {
+ next = kvm_pmd_addr_end(addr, end);
+ if (!pmd_none(*pmd)) {
+ unmap_ptes(kvm, pmd, addr, next);
}
+ } while (pmd++, addr = next, addr != end);
- pmd = pmd_offset(pud, addr);
- if (pmd_none(*pmd)) {
- addr = kvm_pmd_addr_end(addr, end);
- continue;
- }
+ if (kvm_pmd_table_empty(start_pmd))
+ clear_pud_entry(kvm, pud, start_addr);
+}
- pte = pte_offset_kernel(pmd, addr);
- clear_pte_entry(kvm, pte, addr);
- next = addr + PAGE_SIZE;
-
- /* If we emptied the pte, walk back up the ladder */
- if (page_empty(pte)) {
- clear_pmd_entry(kvm, pmd, addr);
- next = kvm_pmd_addr_end(addr, end);
- if (page_empty(pmd) && !page_empty(pud)) {
- clear_pud_entry(kvm, pud, addr);
- next = kvm_pud_addr_end(addr, end);
- }
+static void unmap_puds(struct kvm *kvm, pgd_t *pgd,
+ phys_addr_t addr, phys_addr_t end)
+{
+ phys_addr_t next, start_addr = addr;
+ pud_t *pud, *start_pud;
+
+ start_pud = pud = pud_offset(pgd, addr);
+ do {
+ next = kvm_pud_addr_end(addr, end);
+ if (!pud_none(*pud)) {
+ unmap_pmds(kvm, pud, addr, next);
}
+ } while (pud++, addr = next, addr != end);
- addr = next;
- }
+ if (kvm_pud_table_empty(start_pud))
+ clear_pgd_entry(kvm, pgd, start_addr);
+}
+
+
+static void unmap_range(struct kvm *kvm, pgd_t *pgdp,
+ phys_addr_t start, u64 size)
+{
+ pgd_t *pgd;
+ phys_addr_t addr = start, end = start + size;
+ phys_addr_t next;
+
+ pgd = pgdp + pgd_index(addr);
+ do {
+ next = kvm_pgd_addr_end(addr, end);
+ unmap_puds(kvm, pgd, addr, next);
+ } while (pgd++, addr = next, addr != end);
}
static void stage2_flush_ptes(struct kvm *kvm, pmd_t *pmd,
@@ -119,6 +119,20 @@ static inline void kvm_set_s2pte_writable(pte_t *pte)
#define kvm_pud_addr_end(addr, end) pud_addr_end(addr, end)
#define kvm_pmd_addr_end(addr, end) pmd_addr_end(addr, end)
+static inline bool kvm_page_empty(void *ptr)
+{
+ struct page *ptr_page = virt_to_page(ptr);
+ return page_count(ptr_page) == 1;
+}
+
+#define kvm_pte_table_empty(ptep) kvm_page_empty(ptep)
+#ifndef CONFIG_ARM64_64K_PAGES
+#define kvm_pmd_table_empty(pmdp) kvm_page_empty(pmdp)
+#else
+#define kvm_pmd_table_empty(pmdp) (0)
+#endif
+#define kvm_pud_table_empty(pudp) (0)
+
struct kvm;
#define kvm_flush_dcache_to_poc(a,l) __flush_dcache_area((a), (l))
From: Christoffer Dall <christoffer.dall@linaro.org> 3.12-stable review patch. If anyone has any objections, please let me know.