[PATCH v2 08/16] KMV: arm64: Pass page table walker flags to stage2_apply_range_*()
Vipin Sharma
vipinsh at google.com
Fri Jun 2 09:09:06 PDT 2023
Allow stage2_apply_range_*() to accept enum kvm_pgtable_walk_flags{}
for stage 2 walkers. Pass 0 as the flag value from all of its caller
effectively making it a no-op.
Page table walker flags will be used in future commits to enable
clear-dirty-log operation under MMU read lock.
Current users of stage2_apply_range_*() API runs under assumption of
holding MMU write lock. Stage2 page table walkers then run under the
same assumption. In future commits, when clear-dirty-log is modified to
run under MMU read lock then this flag will be used to pass shared page
walk intent.
No functional changes intended.
Signed-off-by: Vipin Sharma <vipinsh at google.com>
---
arch/arm64/include/asm/kvm_pgtable.h | 12 +++++++++---
arch/arm64/kvm/hyp/nvhe/mem_protect.c | 4 ++--
arch/arm64/kvm/hyp/pgtable.c | 16 ++++++++++------
arch/arm64/kvm/mmu.c | 26 ++++++++++++++++----------
4 files changed, 37 insertions(+), 21 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
index d542a671c564..8ef7e8f3f054 100644
--- a/arch/arm64/include/asm/kvm_pgtable.h
+++ b/arch/arm64/include/asm/kvm_pgtable.h
@@ -560,6 +560,7 @@ int kvm_pgtable_stage2_set_owner(struct kvm_pgtable *pgt, u64 addr, u64 size,
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init*().
* @addr: Intermediate physical address from which to remove the mapping.
* @size: Size of the mapping.
+ * @flags: Page-table walker flags.
*
* The offset of @addr within a page is ignored and @size is rounded-up to
* the next page boundary.
@@ -572,7 +573,8 @@ int kvm_pgtable_stage2_set_owner(struct kvm_pgtable *pgt, u64 addr, u64 size,
*
* Return: 0 on success, negative error code on failure.
*/
-int kvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size);
+int kvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size,
+ enum kvm_pgtable_walk_flags flags);
/**
* kvm_pgtable_stage2_wrprotect() - Write-protect guest stage-2 address range
@@ -580,6 +582,7 @@ int kvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size);
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init*().
* @addr: Intermediate physical address from which to write-protect,
* @size: Size of the range.
+ * @flags: Page-table walker flags.
*
* The offset of @addr within a page is ignored and @size is rounded-up to
* the next page boundary.
@@ -590,7 +593,8 @@ int kvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size);
*
* Return: 0 on success, negative error code on failure.
*/
-int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size);
+int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size,
+ enum kvm_pgtable_walk_flags flags);
/**
* kvm_pgtable_stage2_mkyoung() - Set the access flag in a page-table entry.
@@ -662,13 +666,15 @@ bool kvm_pgtable_stage2_is_young(struct kvm_pgtable *pgt, u64 addr);
* @pgt: Page-table structure initialised by kvm_pgtable_stage2_init*().
* @addr: Intermediate physical address from which to flush.
* @size: Size of the range.
+ * @flags: Page-table walker flags.
*
* The offset of @addr within a page is ignored and @size is rounded-up to
* the next page boundary.
*
* Return: 0 on success, negative error code on failure.
*/
-int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size);
+int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size,
+ enum kvm_pgtable_walk_flags flags);
/**
* kvm_pgtable_stage2_split() - Split a range of huge pages into leaf PTEs pointing
diff --git a/arch/arm64/kvm/hyp/nvhe/mem_protect.c b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
index d35e75b13ffe..13f5cf5f87c3 100644
--- a/arch/arm64/kvm/hyp/nvhe/mem_protect.c
+++ b/arch/arm64/kvm/hyp/nvhe/mem_protect.c
@@ -333,11 +333,11 @@ static int host_stage2_unmap_dev_all(void)
/* Unmap all non-memory regions to recycle the pages */
for (i = 0; i < hyp_memblock_nr; i++, addr = reg->base + reg->size) {
reg = &hyp_memory[i];
- ret = kvm_pgtable_stage2_unmap(pgt, addr, reg->base - addr);
+ ret = kvm_pgtable_stage2_unmap(pgt, addr, reg->base - addr, 0);
if (ret)
return ret;
}
- return kvm_pgtable_stage2_unmap(pgt, addr, BIT(pgt->ia_bits) - addr);
+ return kvm_pgtable_stage2_unmap(pgt, addr, BIT(pgt->ia_bits) - addr, 0);
}
struct kvm_mem_range {
diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
index 364b68013038..a3a0812b2301 100644
--- a/arch/arm64/kvm/hyp/pgtable.c
+++ b/arch/arm64/kvm/hyp/pgtable.c
@@ -1044,12 +1044,14 @@ static int stage2_unmap_walker(const struct kvm_pgtable_visit_ctx *ctx,
return 0;
}
-int kvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size)
+int kvm_pgtable_stage2_unmap(struct kvm_pgtable *pgt, u64 addr, u64 size,
+ enum kvm_pgtable_walk_flags flags)
{
struct kvm_pgtable_walker walker = {
.cb = stage2_unmap_walker,
.arg = pgt,
- .flags = KVM_PGTABLE_WALK_LEAF | KVM_PGTABLE_WALK_TABLE_POST,
+ .flags = flags | KVM_PGTABLE_WALK_LEAF |
+ KVM_PGTABLE_WALK_TABLE_POST,
};
return kvm_pgtable_walk(pgt, addr, size, &walker);
@@ -1128,11 +1130,12 @@ static int stage2_update_leaf_attrs(struct kvm_pgtable *pgt, u64 addr,
return 0;
}
-int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size)
+int kvm_pgtable_stage2_wrprotect(struct kvm_pgtable *pgt, u64 addr, u64 size,
+ enum kvm_pgtable_walk_flags flags)
{
return stage2_update_leaf_attrs(pgt, addr, size, 0,
KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W,
- NULL, NULL, 0);
+ NULL, NULL, flags);
}
kvm_pte_t kvm_pgtable_stage2_mkyoung(struct kvm_pgtable *pgt, u64 addr)
@@ -1213,11 +1216,12 @@ static int stage2_flush_walker(const struct kvm_pgtable_visit_ctx *ctx,
return 0;
}
-int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size)
+int kvm_pgtable_stage2_flush(struct kvm_pgtable *pgt, u64 addr, u64 size,
+ enum kvm_pgtable_walk_flags flags)
{
struct kvm_pgtable_walker walker = {
.cb = stage2_flush_walker,
- .flags = KVM_PGTABLE_WALK_LEAF,
+ .flags = flags | KVM_PGTABLE_WALK_LEAF,
.arg = pgt,
};
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 0c2c2c0846f1..1030921d89f8 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -55,7 +55,9 @@ static phys_addr_t stage2_range_addr_end(phys_addr_t addr, phys_addr_t end)
*/
static int stage2_apply_range(struct kvm_s2_mmu *mmu, phys_addr_t addr,
phys_addr_t end,
- int (*fn)(struct kvm_pgtable *, u64, u64),
+ enum kvm_pgtable_walk_flags flags,
+ int (*fn)(struct kvm_pgtable *, u64, u64,
+ enum kvm_pgtable_walk_flags),
bool resched)
{
struct kvm *kvm = kvm_s2_mmu_to_kvm(mmu);
@@ -68,7 +70,7 @@ static int stage2_apply_range(struct kvm_s2_mmu *mmu, phys_addr_t addr,
return -EINVAL;
next = stage2_range_addr_end(addr, end);
- ret = fn(pgt, addr, next - addr);
+ ret = fn(pgt, addr, next - addr, flags);
if (ret)
break;
@@ -79,8 +81,8 @@ static int stage2_apply_range(struct kvm_s2_mmu *mmu, phys_addr_t addr,
return ret;
}
-#define stage2_apply_range_resched(mmu, addr, end, fn) \
- stage2_apply_range(mmu, addr, end, fn, true)
+#define stage2_apply_range_resched(mmu, addr, end, flags, fn) \
+ stage2_apply_range(mmu, addr, end, flags, fn, true)
/*
* Get the maximum number of page-tables pages needed to split a range
@@ -316,7 +318,7 @@ static void __unmap_stage2_range(struct kvm_s2_mmu *mmu, phys_addr_t start, u64
lockdep_assert_held_write(&kvm->mmu_lock);
WARN_ON(size & ~PAGE_MASK);
- WARN_ON(stage2_apply_range(mmu, start, end, kvm_pgtable_stage2_unmap,
+ WARN_ON(stage2_apply_range(mmu, start, end, 0, kvm_pgtable_stage2_unmap,
may_block));
}
@@ -331,7 +333,8 @@ static void stage2_flush_memslot(struct kvm *kvm,
phys_addr_t addr = memslot->base_gfn << PAGE_SHIFT;
phys_addr_t end = addr + PAGE_SIZE * memslot->npages;
- stage2_apply_range_resched(&kvm->arch.mmu, addr, end, kvm_pgtable_stage2_flush);
+ stage2_apply_range_resched(&kvm->arch.mmu, addr, end, 0,
+ kvm_pgtable_stage2_flush);
}
/**
@@ -1041,10 +1044,13 @@ int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa,
* @mmu: The KVM stage-2 MMU pointer
* @addr: Start address of range
* @end: End address of range
+ * @flags: Page-table walker flags.
*/
-static void stage2_wp_range(struct kvm_s2_mmu *mmu, phys_addr_t addr, phys_addr_t end)
+static void stage2_wp_range(struct kvm_s2_mmu *mmu, phys_addr_t addr, phys_addr_t end,
+ enum kvm_pgtable_walk_flags flags)
{
- stage2_apply_range_resched(mmu, addr, end, kvm_pgtable_stage2_wrprotect);
+ stage2_apply_range_resched(mmu, addr, end, flags,
+ kvm_pgtable_stage2_wrprotect);
}
/**
@@ -1073,7 +1079,7 @@ static void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot)
end = (memslot->base_gfn + memslot->npages) << PAGE_SHIFT;
write_lock(&kvm->mmu_lock);
- stage2_wp_range(&kvm->arch.mmu, start, end);
+ stage2_wp_range(&kvm->arch.mmu, start, end, 0);
write_unlock(&kvm->mmu_lock);
kvm_flush_remote_tlbs(kvm);
}
@@ -1128,7 +1134,7 @@ void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
write_lock(&kvm->mmu_lock);
lockdep_assert_held_write(&kvm->mmu_lock);
- stage2_wp_range(&kvm->arch.mmu, start, end);
+ stage2_wp_range(&kvm->arch.mmu, start, end, 0);
/*
* Eager-splitting is done when manual-protect is set. We
--
2.41.0.rc0.172.g3f132b7071-goog
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