2023-07-18 23:50:42

by Sean Christopherson

Subject: [RFC PATCH v11 02/29] KVM: Tweak kvm_hva_range and hva_handler_t to allow reusing for gfn ranges

Signed-off-by: Sean Christopherson <[email protected]>
---
virt/kvm/kvm_main.c | 34 +++++++++++++++++++---------------
1 file changed, 19 insertions(+), 15 deletions(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index d58b7a506d27..50aea855eeae 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -516,21 +516,25 @@ static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
return container_of(mn, struct kvm, mmu_notifier);
}

-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);

typedef void (*on_unlock_fn_t)(struct kvm *kvm);

-struct kvm_hva_range {
- unsigned long start;
- unsigned long end;
+struct kvm_mmu_notifier_range {
+ /*
+ * 64-bit addresses, as KVM notifiers can operate on host virtual
+ * addresses (unsigned long) and guest physical addresses (64-bit).
+ */
+ u64 start;
+ u64 end;
union {
pte_t pte;
u64 raw;
} arg;
- hva_handler_t handler;
+ gfn_handler_t handler;
on_lock_fn_t on_lock;
on_unlock_fn_t on_unlock;
bool flush_on_ret;
@@ -557,7 +561,7 @@ static void kvm_null_fn(void)
node = interval_tree_iter_next(node, start, last)) \

static __always_inline int __kvm_handle_hva_range(struct kvm *kvm,
- const struct kvm_hva_range *range)
+ const struct kvm_mmu_notifier_range *range)
{
bool ret = false, locked = false;
struct kvm_gfn_range gfn_range;
@@ -588,9 +592,9 @@ static __always_inline int __kvm_handle_hva_range(struct kvm *kvm,
unsigned long hva_start, hva_end;

slot = container_of(node, struct kvm_memory_slot, hva_node[slots->node_idx]);
- hva_start = max(range->start, slot->userspace_addr);
- hva_end = min(range->end, slot->userspace_addr +
- (slot->npages << PAGE_SHIFT));
+ hva_start = max_t(unsigned long, range->start, slot->userspace_addr);
+ hva_end = min_t(unsigned long, range->end,
+ slot->userspace_addr + (slot->npages << PAGE_SHIFT));

/*
* To optimize for the likely case where the address
@@ -640,10 +644,10 @@ 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_mmu_notifier_range range = {
.start = start,
.end = end,
.arg.pte = pte,
@@ -660,10 +664,10 @@ static __always_inline int kvm_handle_hva_range(struct mmu_notifier *mn,
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_mmu_notifier_range range = {
.start = start,
.end = end,
.handler = handler,
@@ -750,7 +754,7 @@ 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_mmu_notifier_range hva_range = {
.start = range->start,
.end = range->end,
.handler = kvm_unmap_gfn_range,
@@ -814,7 +818,7 @@ 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_mmu_notifier_range hva_range = {
.start = range->start,
.end = range->end,
.handler = (void *)kvm_null_fn,
--
2.41.0.255.g8b1d071c50-goog

2023-07-19 17:20:35

by Paolo Bonzini

Subject: Re: [RFC PATCH v11 02/29] KVM: Tweak kvm_hva_range and hva_handler_t to allow reusing for gfn ranges

On 7/19/23 01:44, Sean Christopherson wrote:
> Signed-off-by: Sean Christopherson<[email protected]>
> ---
> virt/kvm/kvm_main.c | 34 +++++++++++++++++++---------------
> 1 file changed, 19 insertions(+), 15 deletions(-)

Reviewed-by: Paolo Bonzini <[email protected]>