On 30.01.2018 19:52, Claudio Imbrenda wrote:
> These are some utilty functions that will be used later on for storage
s/utilty/utility/
> attributes migration.
>
> Signed-off-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxxxxxxx>
> ---
> arch/s390/kvm/kvm-s390.c | 33 +++++++++++++++++++++++++++++++++
> arch/s390/kvm/kvm-s390.h | 7 +++++++
> include/linux/kvm_host.h | 7 +++++++
> virt/kvm/kvm_main.c | 2 +-
> 4 files changed, 48 insertions(+), 1 deletion(-)
>
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 1371dff..d0b9c92 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -1504,6 +1504,39 @@ static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
> #define KVM_S390_CMMA_SIZE_MAX ((u32)KVM_S390_SKEYS_MAX)
>
> /*
> + * Similar to gfn_to_memslot, but returns the index of a memslot also when the
> + * address falls in a hole. In that case the index of one of the memslots
> + * bordering the hole is returned.
> + */
> +static int gfn_to_memslot_approx(struct kvm *kvm, gfn_t gfn)
> +{
> + struct kvm_memslots *slots = kvm_memslots(kvm);
> + int start = 0, end = slots->used_slots;
> + int slot = atomic_read(&slots->lru_slot);
> + struct kvm_memory_slot *memslots = slots->memslots;
> +
> + if (gfn >= memslots[slot].base_gfn &&
> + gfn < memslots[slot].base_gfn + memslots[slot].npages)
> + return slot;
> +
> + while (start < end) {
> + slot = start + (end - start) / 2;
> +
> + if (gfn >= memslots[slot].base_gfn)
> + end = slot;
> + else
> + start = slot + 1;
> + }
> +
> + if (gfn >= memslots[start].base_gfn &&
> + gfn < memslots[start].base_gfn + memslots[start].npages) {
> + atomic_set(&slots->lru_slot, start);
> + }
> +
> + return start;
> +}
> +
> +/*
> * This function searches for the next page with dirty CMMA attributes, and
> * saves the attributes in the buffer up to either the end of the buffer or
> * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
> diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
> index 5e46ba4..8086d69 100644
> --- a/arch/s390/kvm/kvm-s390.h
> +++ b/arch/s390/kvm/kvm-s390.h
> @@ -183,6 +183,13 @@ static inline int kvm_s390_user_cpu_state_ctrl(struct kvm *kvm)
> return kvm->arch.user_cpu_state_ctrl != 0;
> }
>
> +static inline unsigned long *cmma_bitmap(struct kvm_memory_slot *slot)
> +{
> + unsigned long len = kvm_dirty_bitmap_bytes(slot);
> +
> + return slot->dirty_bitmap + len / sizeof(*slot->dirty_bitmap);
> +}
It seems like you forgot to remove this.
> +
> /* implemented in interrupt.c */
> int kvm_s390_handle_wait(struct kvm_vcpu *vcpu);
> void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu);
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 6bdd4b9..ea524a8 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -308,6 +308,13 @@ static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memsl
> return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
> }
>
> +static inline unsigned long *kvm_shadow_dirty_bitmap(struct kvm_memory_slot *memslot)
Hrm, it's only more or less a shadow for the generic dirty case which
you touch below. I'd like to have an opinion from Paolo on this one as
we touch common code.
Also I'd want to split this, taking the memslot stuff into the next
patch and do the generic dirty bitmap helper in this one.
> +{
> + unsigned long len = kvm_dirty_bitmap_bytes(memslot);
> +
> + return memslot->dirty_bitmap + len / sizeof(*memslot->dirty_bitmap);
> +}
> +
> struct kvm_s390_adapter_int {
> u64 ind_addr;
> u64 summary_addr;
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 210bf82..9e18331 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -1158,7 +1158,7 @@ int kvm_get_dirty_log_protect(struct kvm *kvm,
>
> n = kvm_dirty_bitmap_bytes(memslot);
>
> - dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
> + dirty_bitmap_buffer = kvm_shadow_dirty_bitmap(memslot);
> memset(dirty_bitmap_buffer, 0, n);
>
> spin_lock(&kvm->mmu_lock);
>
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