On 14/11/2014 03:06, Mario Smarduch wrote:
> Hi Paolo,
>
> I changed your patch a little to use a Kconfig symbol,
> hope that's fine with you.
Of course, thanks.
Paolo
> - Mario
>
> On 11/13/2014 05:57 PM, Mario Smarduch wrote:
>> From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
>>
>> We now have a generic function that does most of the work of
>> kvm_vm_ioctl_get_dirty_log, now use it.
>>
>> Signed-off-by: Mario Smarduch <m.smarduch@xxxxxxxxxxx>
>> ---
>> arch/x86/include/asm/kvm_host.h | 3 --
>> arch/x86/kvm/Kconfig | 1 +
>> arch/x86/kvm/mmu.c | 4 +--
>> arch/x86/kvm/x86.c | 64 ++++++---------------------------------
>> 4 files changed, 12 insertions(+), 60 deletions(-)
>>
>> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
>> index 7c492ed..934dc24 100644
>> --- a/arch/x86/include/asm/kvm_host.h
>> +++ b/arch/x86/include/asm/kvm_host.h
>> @@ -805,9 +805,6 @@ void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
>>
>> void kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
>> void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
>> -void kvm_mmu_write_protect_pt_masked(struct kvm *kvm,
>> - struct kvm_memory_slot *slot,
>> - gfn_t gfn_offset, unsigned long mask);
>> void kvm_mmu_zap_all(struct kvm *kvm);
>> void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm);
>> unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
>> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
>> index f9d16ff..d073594 100644
>> --- a/arch/x86/kvm/Kconfig
>> +++ b/arch/x86/kvm/Kconfig
>> @@ -39,6 +39,7 @@ config KVM
>> select PERF_EVENTS
>> select HAVE_KVM_MSI
>> select HAVE_KVM_CPU_RELAX_INTERCEPT
>> + select KVM_GENERIC_DIRTYLOG_READ_PROTECT
>> select KVM_VFIO
>> ---help---
>> Support hosting fully virtualized guest machines using hardware
>> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
>> index 9314678..bf6b82c 100644
>> --- a/arch/x86/kvm/mmu.c
>> +++ b/arch/x86/kvm/mmu.c
>> @@ -1224,7 +1224,7 @@ static bool __rmap_write_protect(struct kvm *kvm, unsigned long *rmapp,
>> }
>>
>> /**
>> - * kvm_mmu_write_protect_pt_masked - write protect selected PT level pages
>> + * kvm_arch_mmu_write_protect_pt_masked - write protect selected PT level pages
>> * @kvm: kvm instance
>> * @slot: slot to protect
>> * @gfn_offset: start of the BITS_PER_LONG pages we care about
>> @@ -1233,7 +1233,7 @@ static bool __rmap_write_protect(struct kvm *kvm, unsigned long *rmapp,
>> * Used when we do not need to care about huge page mappings: e.g. during dirty
>> * logging we do not have any such mappings.
>> */
>> -void kvm_mmu_write_protect_pt_masked(struct kvm *kvm,
>> +void kvm_arch_mmu_write_protect_pt_masked(struct kvm *kvm,
>> struct kvm_memory_slot *slot,
>> gfn_t gfn_offset, unsigned long mask)
>> {
>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>> index 8f1e22d..9f8ae9a 100644
>> --- a/arch/x86/kvm/x86.c
>> +++ b/arch/x86/kvm/x86.c
>> @@ -3606,77 +3606,31 @@ static int kvm_vm_ioctl_reinject(struct kvm *kvm,
>> *
>> * 1. Take a snapshot of the bit and clear it if needed.
>> * 2. Write protect the corresponding page.
>> - * 3. Flush TLB's if needed.
>> - * 4. Copy the snapshot to the userspace.
>> + * 3. Copy the snapshot to the userspace.
>> + * 4. Flush TLB's if needed.
>> *
>> - * Between 2 and 3, the guest may write to the page using the remaining TLB
>> - * entry. This is not a problem because the page will be reported dirty at
>> - * step 4 using the snapshot taken before and step 3 ensures that successive
>> - * writes will be logged for the next call.
>> + * Between 2 and 4, the guest may write to the page using the remaining TLB
>> + * entry. This is not a problem because the page is reported dirty using
>> + * the snapshot taken before and step 4 ensures that writes done after
>> + * exiting to userspace will be logged for the next call.
>> */
>> int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
>> {
>> - int r;
>> - struct kvm_memory_slot *memslot;
>> - unsigned long n, i;
>> - unsigned long *dirty_bitmap;
>> - unsigned long *dirty_bitmap_buffer;
>> bool is_dirty = false;
>> + int r;
>>
>> mutex_lock(&kvm->slots_lock);
>>
>> - r = -EINVAL;
>> - if (log->slot >= KVM_USER_MEM_SLOTS)
>> - goto out;
>> -
>> - memslot = id_to_memslot(kvm->memslots, log->slot);
>> -
>> - dirty_bitmap = memslot->dirty_bitmap;
>> - r = -ENOENT;
>> - if (!dirty_bitmap)
>> - goto out;
>> -
>> - n = kvm_dirty_bitmap_bytes(memslot);
>> -
>> - dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
>> - memset(dirty_bitmap_buffer, 0, n);
>> -
>> - spin_lock(&kvm->mmu_lock);
>> -
>> - for (i = 0; i < n / sizeof(long); i++) {
>> - unsigned long mask;
>> - gfn_t offset;
>> -
>> - if (!dirty_bitmap[i])
>> - continue;
>> -
>> - is_dirty = true;
>> -
>> - mask = xchg(&dirty_bitmap[i], 0);
>> - dirty_bitmap_buffer[i] = mask;
>> -
>> - offset = i * BITS_PER_LONG;
>> - kvm_mmu_write_protect_pt_masked(kvm, memslot, offset, mask);
>> - }
>> -
>> - spin_unlock(&kvm->mmu_lock);
>> -
>> - /* See the comments in kvm_mmu_slot_remove_write_access(). */
>> - lockdep_assert_held(&kvm->slots_lock);
>> + r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
>>
>> /*
>> * All the TLBs can be flushed out of mmu lock, see the comments in
>> * kvm_mmu_slot_remove_write_access().
>> */
>> + lockdep_assert_held(&kvm->slots_lock);
>> if (is_dirty)
>> kvm_flush_remote_tlbs(kvm);
>>
>> - r = -EFAULT;
>> - if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
>> - goto out;
>> -
>> - r = 0;
>> -out:
>> mutex_unlock(&kvm->slots_lock);
>> return r;
>> }
>>
>
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