This is v8 of the dirty quota series, with the following changes over v7: 1. Removed pages_dirtied stat. Now, a single variable dirty_quota_bytes is being used for throttling. 2. IOCTL to enable/disable dirty quota throttling. Enabling/disabling can be done dynamically, e.g. we can enable dirty quota just before a live migration and disable it just after the live migration. 3. Decoupled dirty quota from dirty logging. Introduced a new function update_dirty_quota that decreases dirty_quota_bytes by by the appropriate architecture-specific granule or page size. It also raises a KVM request if dirty quota is exhausted. 4. Each arch that wants to use dirty quota throttling feature needs to call update_dirty_quota at each time a page is dirtied. Also, it needs to process the KVM request raised by update_dirty_quota and facilitate exit to userspace. Added support for x86 and arm64. 5. Code refactoring and minor nits. v1: https://lore.kernel.org/kvm/20211114145721.209219-1-shivam.kumar1@xxxxxxxxxxx/ v2: https://lore.kernel.org/kvm/Ydx2EW6U3fpJoJF0@xxxxxxxxxx/T/ v3: https://lore.kernel.org/kvm/YkT1kzWidaRFdQQh@xxxxxxxxxx/T/ v4: https://lore.kernel.org/all/20220521202937.184189-1-shivam.kumar1@xxxxxxxxxxx/ v5: https://lore.kernel.org/all/202209130532.2BJwW65L-lkp@xxxxxxxxx/T/ v6: https://lore.kernel.org/all/20220915101049.187325-1-shivam.kumar1@xxxxxxxxxxx/ v7: https://lore.kernel.org/all/a64d9818-c68d-1e33-5783-414e9a9bdbd1@xxxxxxxxxxx/t/ Thanks, Shivam Shivam Kumar (3): KVM: Implement dirty quota-based throttling of vcpus KVM: x86: Dirty quota-based throttling of vcpus KVM: arm64: Dirty quota-based throttling of vcpus Documentation/virt/kvm/api.rst | 17 +++++++++++++++++ arch/arm64/kvm/Kconfig | 1 + arch/arm64/kvm/arm.c | 7 +++++++ arch/arm64/kvm/mmu.c | 3 +++ arch/x86/kvm/Kconfig | 1 + arch/x86/kvm/mmu/mmu.c | 8 +++++++- arch/x86/kvm/mmu/spte.c | 3 +++ arch/x86/kvm/mmu/tdp_mmu.c | 3 +++ arch/x86/kvm/vmx/vmx.c | 5 +++++ arch/x86/kvm/x86.c | 16 ++++++++++++++++ arch/x86/kvm/xen.c | 12 +++++++++++- include/linux/kvm_host.h | 5 +++++ include/uapi/linux/kvm.h | 8 ++++++++ tools/include/uapi/linux/kvm.h | 1 + virt/kvm/Kconfig | 3 +++ virt/kvm/kvm_main.c | 31 +++++++++++++++++++++++++++++++ 16 files changed, 122 insertions(+), 2 deletions(-) -- 2.22.3
