diff mbox series

[v13,01/35] KVM: Tweak kvm_hva_range and hva_handler_t to allow reusing for gfn ranges

Message ID 20231027182217.3615211-2-seanjc@google.com (mailing list archive)
State Handled Elsewhere
Headers show
Series KVM: guest_memfd() and per-page attributes | expand

Commit Message

Sean Christopherson Oct. 27, 2023, 6:21 p.m. UTC 
Rework and rename "struct kvm_hva_range" into "kvm_mmu_notifier_range" so
that the structure can be used to handle notifications that operate on gfn
context, i.e. that aren't tied to a host virtual address.  Rename the
handler typedef too (arguably it should always have been gfn_handler_t).

Practically speaking, this is a nop for 64-bit kernels as the only
meaningful change is to store start+end as u64s instead of unsigned longs.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 virt/kvm/kvm_main.c | 34 +++++++++++++++++++---------------
 1 file changed, 19 insertions(+), 15 deletions(-)

Comments

Fuad Tabba Nov. 1, 2023, 12:46 p.m. UTC | #1 
On Fri, Oct 27, 2023 at 7:22 PM Sean Christopherson <seanjc@google.com> wrote:
>
> Rework and rename "struct kvm_hva_range" into "kvm_mmu_notifier_range" so
> that the structure can be used to handle notifications that operate on gfn
> context, i.e. that aren't tied to a host virtual address.  Rename the
> handler typedef too (arguably it should always have been gfn_handler_t).
>
> Practically speaking, this is a nop for 64-bit kernels as the only
> meaningful change is to store start+end as u64s instead of unsigned longs.
>
> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
> Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---

Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>

Cheers,
/fuad


>  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 486800a7024b..0524933856d4 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -541,18 +541,22 @@ 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 kvm_mmu_notifier_arg 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;
> @@ -581,7 +585,7 @@ static const union kvm_mmu_notifier_arg KVM_MMU_NOTIFIER_NO_ARG;
>              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;
> @@ -608,9 +612,9 @@ 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
> @@ -660,10 +664,10 @@ static __always_inline int kvm_handle_hva_range(struct mmu_notifier *mn,
>                                                 unsigned long start,
>                                                 unsigned long end,
>                                                 union kvm_mmu_notifier_arg arg,
> -                                               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            = arg,
> @@ -680,10 +684,10 @@ 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,
> @@ -771,7 +775,7 @@ 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,
> @@ -835,7 +839,7 @@ 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,
> --
> 2.42.0.820.g83a721a137-goog
>
diff mbox series

Patch

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 486800a7024b..0524933856d4 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -541,18 +541,22 @@  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 kvm_mmu_notifier_arg 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;
@@ -581,7 +585,7 @@  static const union kvm_mmu_notifier_arg KVM_MMU_NOTIFIER_NO_ARG;
 	     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;
@@ -608,9 +612,9 @@  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
@@ -660,10 +664,10 @@  static __always_inline int kvm_handle_hva_range(struct mmu_notifier *mn,
 						unsigned long start,
 						unsigned long end,
 						union kvm_mmu_notifier_arg arg,
-						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		= arg,
@@ -680,10 +684,10 @@  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,
@@ -771,7 +775,7 @@  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,
@@ -835,7 +839,7 @@  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,