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[PATCH v3 06/15] KVM: Refactor hva based memory invalidation code
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From: |
Chao Peng |
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Subject: |
[PATCH v3 06/15] KVM: Refactor hva based memory invalidation code |
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Date: |
Tue, 21 Dec 2021 23:11:16 +0800 |
The purpose of this patch is for fd-based memslot to reuse the same
mmu_notifier based guest memory invalidation code for private pages.
No functional changes except renaming 'hva' to more neutral 'useraddr'
so that it can also cover 'offset' in a fd that private pages live in.
Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com>
Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
---
include/linux/kvm_host.h | 8 +++++--
virt/kvm/kvm_main.c | 47 +++++++++++++++++++++-------------------
2 files changed, 31 insertions(+), 24 deletions(-)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index b0b63c9a160f..7279f46f35d3 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1327,9 +1327,13 @@ static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
}
static inline gfn_t
-hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot)
+useraddr_to_gfn_memslot(unsigned long useraddr, struct kvm_memory_slot *slot,
+ bool addr_is_hva)
{
- gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT;
+ unsigned long useraddr_base = addr_is_hva ? slot->userspace_addr
+ : slot->file_ofs;
+
+ gfn_t gfn_offset = (useraddr - useraddr_base) >> PAGE_SHIFT;
return slot->base_gfn + gfn_offset;
}
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 68018ee7f0cd..856f89ed8ab5 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -471,16 +471,16 @@ static void kvm_mmu_notifier_invalidate_range(struct
mmu_notifier *mn,
srcu_read_unlock(&kvm->srcu, idx);
}
-typedef bool (*hva_handler_t)(struct kvm *kvm, struct kvm_gfn_range *range);
+typedef bool (*gfn_handler_t)(struct kvm *kvm, struct kvm_gfn_range *range);
typedef void (*on_lock_fn_t)(struct kvm *kvm, unsigned long start,
unsigned long end);
-struct kvm_hva_range {
+struct kvm_useraddr_range {
unsigned long start;
unsigned long end;
pte_t pte;
- hva_handler_t handler;
+ gfn_handler_t handler;
on_lock_fn_t on_lock;
bool flush_on_ret;
bool may_block;
@@ -499,8 +499,8 @@ static void kvm_null_fn(void)
}
#define IS_KVM_NULL_FN(fn) ((fn) == (void *)kvm_null_fn)
-static __always_inline int __kvm_handle_hva_range(struct kvm *kvm,
- const struct kvm_hva_range
*range)
+static __always_inline int __kvm_handle_useraddr_range(struct kvm *kvm,
+ const struct kvm_useraddr_range *range)
{
bool ret = false, locked = false;
struct kvm_gfn_range gfn_range;
@@ -518,12 +518,12 @@ static __always_inline int __kvm_handle_hva_range(struct
kvm *kvm,
for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
slots = __kvm_memslots(kvm, i);
kvm_for_each_memslot(slot, slots) {
- unsigned long hva_start, hva_end;
+ unsigned long useraddr_start, useraddr_end;
- hva_start = max(range->start, slot->userspace_addr);
- hva_end = min(range->end, slot->userspace_addr +
+ useraddr_start = max(range->start,
slot->userspace_addr);
+ useraddr_end = min(range->end, slot->userspace_addr +
(slot->npages << PAGE_SHIFT));
- if (hva_start >= hva_end)
+ if (useraddr_start >= useraddr_end)
continue;
/*
@@ -536,11 +536,14 @@ static __always_inline int __kvm_handle_hva_range(struct
kvm *kvm,
gfn_range.may_block = range->may_block;
/*
- * {gfn(page) | page intersects with [hva_start,
hva_end)} =
+ * {gfn(page) | page intersects with [useraddr_start,
useraddr_end)} =
* {gfn_start, gfn_start+1, ..., gfn_end-1}.
*/
- gfn_range.start = hva_to_gfn_memslot(hva_start, slot);
- gfn_range.end = hva_to_gfn_memslot(hva_end + PAGE_SIZE
- 1, slot);
+ gfn_range.start =
useraddr_to_gfn_memslot(useraddr_start,
+ slot, true);
+ gfn_range.end = useraddr_to_gfn_memslot(
+ useraddr_end + PAGE_SIZE - 1,
+ slot, true);
gfn_range.slot = slot;
if (!locked) {
@@ -571,10 +574,10 @@ static __always_inline int kvm_handle_hva_range(struct
mmu_notifier *mn,
unsigned long start,
unsigned long end,
pte_t pte,
- hva_handler_t handler)
+ gfn_handler_t handler)
{
struct kvm *kvm = mmu_notifier_to_kvm(mn);
- const struct kvm_hva_range range = {
+ const struct kvm_useraddr_range range = {
.start = start,
.end = end,
.pte = pte,
@@ -584,16 +587,16 @@ static __always_inline int kvm_handle_hva_range(struct
mmu_notifier *mn,
.may_block = false,
};
- return __kvm_handle_hva_range(kvm, &range);
+ return __kvm_handle_useraddr_range(kvm, &range);
}
static __always_inline int kvm_handle_hva_range_no_flush(struct mmu_notifier
*mn,
unsigned long start,
unsigned long end,
- hva_handler_t handler)
+ gfn_handler_t handler)
{
struct kvm *kvm = mmu_notifier_to_kvm(mn);
- const struct kvm_hva_range range = {
+ const struct kvm_useraddr_range range = {
.start = start,
.end = end,
.pte = __pte(0),
@@ -603,7 +606,7 @@ static __always_inline int
kvm_handle_hva_range_no_flush(struct mmu_notifier *mn
.may_block = false,
};
- return __kvm_handle_hva_range(kvm, &range);
+ return __kvm_handle_useraddr_range(kvm, &range);
}
static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
struct mm_struct *mm,
@@ -661,7 +664,7 @@ static int kvm_mmu_notifier_invalidate_range_start(struct
mmu_notifier *mn,
const struct mmu_notifier_range *range)
{
struct kvm *kvm = mmu_notifier_to_kvm(mn);
- const struct kvm_hva_range hva_range = {
+ const struct kvm_useraddr_range useraddr_range = {
.start = range->start,
.end = range->end,
.pte = __pte(0),
@@ -685,7 +688,7 @@ static int kvm_mmu_notifier_invalidate_range_start(struct
mmu_notifier *mn,
kvm->mn_active_invalidate_count++;
spin_unlock(&kvm->mn_invalidate_lock);
- __kvm_handle_hva_range(kvm, &hva_range);
+ __kvm_handle_useraddr_range(kvm, &useraddr_range);
return 0;
}
@@ -712,7 +715,7 @@ static void kvm_mmu_notifier_invalidate_range_end(struct
mmu_notifier *mn,
const struct mmu_notifier_range *range)
{
struct kvm *kvm = mmu_notifier_to_kvm(mn);
- const struct kvm_hva_range hva_range = {
+ const struct kvm_useraddr_range useraddr_range = {
.start = range->start,
.end = range->end,
.pte = __pte(0),
@@ -723,7 +726,7 @@ static void kvm_mmu_notifier_invalidate_range_end(struct
mmu_notifier *mn,
};
bool wake;
- __kvm_handle_hva_range(kvm, &hva_range);
+ __kvm_handle_useraddr_range(kvm, &useraddr_range);
/* Pairs with the increment in range_start(). */
spin_lock(&kvm->mn_invalidate_lock);
--
2.17.1
- [PATCH v3 00/15] KVM: mm: fd-based approach for supporting KVM guest private memory, Chao Peng, 2021/12/21
- [PATCH v3 01/15] mm/shmem: Introduce F_SEAL_INACCESSIBLE, Chao Peng, 2021/12/21
- [PATCH v3 02/15] mm/memfd: Introduce MFD_INACCESSIBLE flag, Chao Peng, 2021/12/21
- [PATCH v3 03/15] mm/memfd: Introduce MEMFD_OPS, Chao Peng, 2021/12/21
- [PATCH v3 04/15] KVM: Extend the memslot to support fd-based private memory, Chao Peng, 2021/12/21
- [PATCH v3 05/15] KVM: Implement fd-based memory using MEMFD_OPS interfaces, Chao Peng, 2021/12/21
- [PATCH v3 06/15] KVM: Refactor hva based memory invalidation code,
Chao Peng <=
- [PATCH v3 07/15] KVM: Special handling for fd-based memory invalidation, Chao Peng, 2021/12/21
- [PATCH v3 08/15] KVM: Split out common memory invalidation code, Chao Peng, 2021/12/21
- [PATCH v3 09/15] KVM: Implement fd-based memory invalidation, Chao Peng, 2021/12/21
- [PATCH v3 12/15] KVM: Add KVM_EXIT_MEMORY_ERROR exit, Chao Peng, 2021/12/21
- [PATCH v3 13/15] KVM: Handle page fault for private memory, Chao Peng, 2021/12/21
- [PATCH v3 14/15] KVM: Use kvm_userspace_memory_region_ext, Chao Peng, 2021/12/21
- [PATCH v3 10/15] KVM: Add kvm_map_gfn_range, Chao Peng, 2021/12/21
- [PATCH v3 15/15] KVM: Register/unregister private memory slot to memfd, Chao Peng, 2021/12/21
- [PATCH v3 11/15] KVM: Implement fd-based memory fallocation, Chao Peng, 2021/12/21
- Re: [PATCH v3 00/15] KVM: mm: fd-based approach for supporting KVM guest private memory, Sean Christopherson, 2021/12/21