[PATCH v4 7/7] arm64: KVM: Implement 4 levels of translation tables for HYP and stage2
Jungseok Lee
jays.lee at samsung.com
Mon Apr 28 22:00:20 PDT 2014
This patch adds 4 levels of translation tables implementation for both
HYP and stage2.
Both symmetric and asymmetric configurations for page size and translation
levels are are validated on Fast Models:
1) 4KB + 3 levels guest on 4KB + 3 levels host
2) 4KB + 4 levels guest on 4KB + 3 levels host
3) 64KB + 2 levels guest on 4KB + 3 levels host
4) 4KB + 3 levels guest on 4KB + 4 levels host
5) 4KB + 4 levels guest on 4KB + 4 levels host
6) 64KB + 2 levels guest on 4KB + 4 levels host
7) 4KB + 3 levels guest on 64KB + 2 levels host
8) 4KB + 4 levels guest on 64KB + 2 levels host
9) 64KB + 2 levels guest on 64KB + 2 levels host
Cc: Marc Zyngier <marc.zyngier at arm.com>
Cc: Christoffer Dall <christoffer.dall at linaro.org>
Signed-off-by: Jungseok Lee <jays.lee at samsung.com>
Reviewed-by: Sungjinn Chung <sungjinn.chung at samsung.com>
---
arch/arm/include/asm/kvm_mmu.h | 10 +++++
arch/arm/kvm/mmu.c | 88 +++++++++++++++++++++++++++++++++-----
arch/arm64/include/asm/kvm_arm.h | 34 ++++++++++++---
arch/arm64/include/asm/kvm_mmu.h | 12 ++++++
4 files changed, 127 insertions(+), 17 deletions(-)
diff --git a/arch/arm/include/asm/kvm_mmu.h b/arch/arm/include/asm/kvm_mmu.h
index 5c7aa3c..31eaaa6 100644
--- a/arch/arm/include/asm/kvm_mmu.h
+++ b/arch/arm/include/asm/kvm_mmu.h
@@ -37,6 +37,11 @@
*/
#define TRAMPOLINE_VA UL(CONFIG_VECTORS_BASE)
+/*
+ * MMU_CACHE_MIN_PAGES is the number of stage2 page table translation levels.
+ */
+#define MMU_CACHE_MIN_PAGES 2
+
#ifndef __ASSEMBLY__
#include <asm/cacheflush.h>
@@ -94,6 +99,11 @@ static inline void kvm_clean_pgd(pgd_t *pgd)
clean_dcache_area(pgd, PTRS_PER_S2_PGD * sizeof(pgd_t));
}
+static inline void kvm_clean_pmd(pmd_t *pmd)
+{
+ clean_dcache_area(pmd, PTRS_PER_PMD * sizeof(pmd_t));
+}
+
static inline void kvm_clean_pmd_entry(pmd_t *pmd)
{
clean_pmd_entry(pmd);
diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index 80bb1e6..3ffbdfb 100644
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -388,13 +388,44 @@ static int create_hyp_pmd_mappings(pud_t *pud, unsigned long start,
return 0;
}
+static int create_hyp_pud_mappings(pgd_t *pgd, unsigned long start,
+ unsigned long end, unsigned long pfn,
+ pgprot_t prot)
+{
+ pud_t *pud;
+ pmd_t *pmd;
+ unsigned long addr, next;
+
+ addr = start;
+ do {
+ pud = pud_offset(pgd, addr);
+
+ if (pud_none_or_clear_bad(pud)) {
+ pmd = pmd_alloc_one(NULL, addr);
+ if (!pmd) {
+ kvm_err("Cannot allocate Hyp pmd\n");
+ return -ENOMEM;
+ }
+ pud_populate(NULL, pud, pmd);
+ get_page(virt_to_page(pud));
+ kvm_flush_dcache_to_poc(pud, sizeof(*pud));
+ }
+
+ next = pud_addr_end(addr, end);
+
+ create_hyp_pmd_mappings(pud, addr, next, pfn, prot);
+ pfn += (next - addr) >> PAGE_SHIFT;
+ } while (addr = next, addr != end);
+
+ return 0;
+}
+
static int __create_hyp_mappings(pgd_t *pgdp,
unsigned long start, unsigned long end,
unsigned long pfn, pgprot_t prot)
{
pgd_t *pgd;
pud_t *pud;
- pmd_t *pmd;
unsigned long addr, next;
int err = 0;
@@ -403,22 +434,23 @@ static int __create_hyp_mappings(pgd_t *pgdp,
end = PAGE_ALIGN(end);
do {
pgd = pgdp + pgd_index(addr);
- pud = pud_offset(pgd, addr);
- if (pud_none_or_clear_bad(pud)) {
- pmd = pmd_alloc_one(NULL, addr);
- if (!pmd) {
- kvm_err("Cannot allocate Hyp pmd\n");
+ if (pgd_none(*pgd)) {
+ pud = pud_alloc_one(NULL, addr);
+ if (!pud) {
+ kvm_err("Cannot allocate Hyp pud\n");
err = -ENOMEM;
goto out;
}
- pud_populate(NULL, pud, pmd);
- get_page(virt_to_page(pud));
- kvm_flush_dcache_to_poc(pud, sizeof(*pud));
+ pgd_populate(NULL, pgd, pud);
+ get_page(virt_to_page(pgd));
+ kvm_flush_dcache_to_poc(pgd, sizeof(*pgd));
}
next = pgd_addr_end(addr, end);
- err = create_hyp_pmd_mappings(pud, addr, next, pfn, prot);
+
+ err = create_hyp_pud_mappings(pgd, addr, next, pfn, prot);
+
if (err)
goto out;
pfn += (next - addr) >> PAGE_SHIFT;
@@ -563,6 +595,24 @@ void kvm_free_stage2_pgd(struct kvm *kvm)
kvm->arch.pgd = NULL;
}
+static pud_t *stage2_get_pud(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
+ phys_addr_t addr)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+
+ pgd = kvm->arch.pgd + pgd_index(addr);
+ if (pgd_none(*pgd)) {
+ if (!cache)
+ return NULL;
+ pud = mmu_memory_cache_alloc(cache);
+ pgd_populate(NULL, pgd, pud);
+ get_page(virt_to_page(pgd));
+ }
+
+ return pud_offset(pgd, addr);
+}
+
static pmd_t *stage2_get_pmd(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
phys_addr_t addr)
{
@@ -614,9 +664,24 @@ static int stage2_set_pmd_huge(struct kvm *kvm, struct kvm_mmu_memory_cache
static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache,
phys_addr_t addr, const pte_t *new_pte, bool iomap)
{
+ pud_t *pud;
pmd_t *pmd;
pte_t *pte, old_pte;
+ /* Create stage-2 page table mapping - Level 0 */
+ pud = stage2_get_pud(kvm, cache, addr);
+ if (!pud)
+ return 0;
+
+ if (pud_none(*pud)) {
+ if (!cache)
+ return 0;
+ pmd = mmu_memory_cache_alloc(cache);
+ kvm_clean_pmd(pmd);
+ pud_populate(NULL, pud, pmd);
+ get_page(virt_to_page(pud));
+ }
+
/* Create stage-2 page table mapping - Level 1 */
pmd = stage2_get_pmd(kvm, cache, addr);
if (!pmd) {
@@ -675,7 +740,8 @@ int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
for (addr = guest_ipa; addr < end; addr += PAGE_SIZE) {
pte_t pte = pfn_pte(pfn, PAGE_S2_DEVICE);
- ret = mmu_topup_memory_cache(&cache, 2, 2);
+ ret = mmu_topup_memory_cache(&cache, MMU_CACHE_MIN_PAGES,
+ MMU_CACHE_MIN_PAGES);
if (ret)
goto out;
spin_lock(&kvm->mmu_lock);
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 3d69030..29c9c25 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -117,9 +117,10 @@
#define VTCR_EL2_IRGN0_MASK (3 << 8)
#define VTCR_EL2_IRGN0_WBWA (1 << 8)
#define VTCR_EL2_SL0_MASK (3 << 6)
+#define VTCR_EL2_SL0_LVL0 (2 << 6)
#define VTCR_EL2_SL0_LVL1 (1 << 6)
#define VTCR_EL2_T0SZ_MASK 0x3f
-#define VTCR_EL2_T0SZ_40B 24
+#define VTCR_EL2_T0SZ(bits) (64 - (bits))
#ifdef CONFIG_ARM64_64K_PAGES
/*
@@ -129,11 +130,14 @@
* 64kB pages (TG0 = 1)
* 2 level page tables (SL = 1)
*/
+#define VTTBR_OUTPUT_BITS 40
#define VTCR_EL2_FLAGS (VTCR_EL2_TG0_64K | VTCR_EL2_SH0_INNER | \
VTCR_EL2_ORGN0_WBWA | VTCR_EL2_IRGN0_WBWA | \
- VTCR_EL2_SL0_LVL1 | VTCR_EL2_T0SZ_40B)
-#define VTTBR_X (38 - VTCR_EL2_T0SZ_40B)
+ VTCR_EL2_SL0_LVL1 | \
+ VTCR_EL2_T0SZ(VTTBR_OUTPUT_BITS))
+#define VTTBR_X (38 - VTCR_EL2_T0SZ(VTTBR_OUTPUT_BITS))
#else
+#ifndef CONFIG_ARM64_4_LEVELS
/*
* Stage2 translation configuration:
* 40bits output (PS = 2)
@@ -141,14 +145,32 @@
* 4kB pages (TG0 = 0)
* 3 level page tables (SL = 1)
*/
+#define VTTBR_OUTPUT_BITS 40
#define VTCR_EL2_FLAGS (VTCR_EL2_TG0_4K | VTCR_EL2_SH0_INNER | \
VTCR_EL2_ORGN0_WBWA | VTCR_EL2_IRGN0_WBWA | \
- VTCR_EL2_SL0_LVL1 | VTCR_EL2_T0SZ_40B)
-#define VTTBR_X (37 - VTCR_EL2_T0SZ_40B)
+ VTCR_EL2_SL0_LVL1 | \
+ VTCR_EL2_T0SZ(VTTBR_OUTPUT_BITS))
+#define VTTBR_X (37 - VTCR_EL2_T0SZ(VTTBR_OUTPUT_BITS))
+#else
+/*
+ * Stage2 translation configuration:
+ * 40bits output (PS = 2)
+ * 48bits input (T0SZ = 16)
+ * 4kB pages (TG0 = 0)
+ * 4 level page tables (SL = 2)
+ */
+#define VTTBR_OUTPUT_BITS 48
+#define VTCR_EL2_FLAGS (VTCR_EL2_TG0_4K | VTCR_EL2_SH0_INNER | \
+ VTCR_EL2_ORGN0_WBWA | VTCR_EL2_IRGN0_WBWA | \
+ VTCR_EL2_SL0_LVL0 | \
+ VTCR_EL2_T0SZ(VTTBR_OUTPUT_BITS))
+#define VTTBR_X (29 - VTCR_EL2_T0SZ(VTTBR_OUTPUT_BITS))
+#endif
#endif
#define VTTBR_BADDR_SHIFT (VTTBR_X - 1)
-#define VTTBR_BADDR_MASK (((1LLU << (40 - VTTBR_X)) - 1) << VTTBR_BADDR_SHIFT)
+#define VTTBR_BADDR_SIZE (1LLU << (VTTBR_OUTPUT_BITS - VTTBR_X))
+#define VTTBR_BADDR_MASK ((VTTBR_BADDR_SIZE - 1) << VTTBR_BADDR_SHIFT)
#define VTTBR_VMID_SHIFT (48LLU)
#define VTTBR_VMID_MASK (0xffLLU << VTTBR_VMID_SHIFT)
diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 7d29847..72bf9ab 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -41,6 +41,17 @@
*/
#define TRAMPOLINE_VA (HYP_PAGE_OFFSET_MASK & PAGE_MASK)
+/*
+ * MMU_CACHE_MIN_PAGES is the number of stage2 page table translation levels.
+ */
+#ifdef CONFIG_ARM64_2_LEVELS
+#define MMU_CACHE_MIN_PAGES 1
+#elif defined(CONFIG_ARM64_3_LEVELS)
+#define MMU_CACHE_MIN_PAGES 2
+#else
+#define MMU_CACHE_MIN_PAGES 3
+#endif
+
#ifdef __ASSEMBLY__
/*
@@ -107,6 +118,7 @@ static inline bool kvm_is_write_fault(unsigned long esr)
}
static inline void kvm_clean_pgd(pgd_t *pgd) {}
+static inline void kvm_clean_pmd(pmd_t *pmd) {}
static inline void kvm_clean_pmd_entry(pmd_t *pmd) {}
static inline void kvm_clean_pte(pte_t *pte) {}
static inline void kvm_clean_pte_entry(pte_t *pte) {}
--
1.7.10.4
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