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Date: Tue, 21 Dec 2021 23:11:16 +0800
From: Chao Peng <chao.p.peng@...ux.intel.com>
To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
qemu-devel@...gnu.org
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Jonathan Corbet <corbet@....net>,
Sean Christopherson <seanjc@...gle.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
Hugh Dickins <hughd@...gle.com>,
Jeff Layton <jlayton@...nel.org>,
"J . Bruce Fields" <bfields@...ldses.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Yu Zhang <yu.c.zhang@...ux.intel.com>,
Chao Peng <chao.p.peng@...ux.intel.com>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
luto@...nel.org, john.ji@...el.com, susie.li@...el.com,
jun.nakajima@...el.com, dave.hansen@...el.com, ak@...ux.intel.com,
david@...hat.com
Subject: [PATCH v3 06/15] KVM: Refactor hva based memory invalidation code
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@...ux.intel.com>
Signed-off-by: Chao Peng <chao.p.peng@...ux.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
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