On 06/18/2013 10:26 PM, Paolo Bonzini wrote: > Il 07/06/2013 10:51, Xiao Guangrong ha scritto: >> Changelog: >> V3: >> All of these changes are from Gleb's review: >> 1) rename RET_MMIO_PF_EMU to RET_MMIO_PF_EMULATE. >> 2) smartly adjust kvm generation number in kvm_current_mmio_generatio() >> to avoid kvm_memslots->generation overflow. >> >> V2: >> - rename kvm_mmu_invalid_mmio_spte to kvm_mmu_invalid_mmio_sptes >> - use kvm->memslots->generation as kvm global generation-number >> - fix comment and codestyle >> - init kvm generation close to mmio wrap-around value >> - keep kvm_mmu_zap_mmio_sptes >> >> The current way is holding hot mmu-lock and walking all shadow pages, this >> is not scale. This patchset tries to introduce a very simple and scale way >> to fast invalidate all mmio sptes - it need not walk any shadow pages and hold >> any locks. >> >> The idea is simple: >> KVM maintains a global mmio valid generation-number which is stored in >> kvm->memslots.generation and every mmio spte stores the current global >> generation-number into his available bits when it is created >> >> When KVM need zap all mmio sptes, it just simply increase the global >> generation-number. When guests do mmio access, KVM intercepts a MMIO #PF >> then it walks the shadow page table and get the mmio spte. If the >> generation-number on the spte does not equal the global generation-number, >> it will go to the normal #PF handler to update the mmio spte >> >> Since 19 bits are used to store generation-number on mmio spte, we zap all >> mmio sptes when the number is round >> >> Xiao Guangrong (6): >> KVM: MMU: retain more available bits on mmio spte >> KVM: MMU: store generation-number into mmio spte >> KVM: MMU: make return value of mmio page fault handler more readable >> KVM: MMU: fast invalidate all mmio sptes >> KVM: MMU: add tracepoint for check_mmio_spte >> KVM: MMU: init kvm generation close to mmio wrap-around value >> >> arch/x86/include/asm/kvm_host.h | 2 +- >> arch/x86/kvm/mmu.c | 131 ++++++++++++++++++++++++++++++++-------- >> arch/x86/kvm/mmu.h | 17 ++++++ >> arch/x86/kvm/mmutrace.h | 34 +++++++++-- >> arch/x86/kvm/paging_tmpl.h | 10 ++- >> arch/x86/kvm/vmx.c | 12 ++-- >> arch/x86/kvm/x86.c | 11 +++- >> 7 files changed, 177 insertions(+), 40 deletions(-) >> > > Xiao, is it time to add more comments to the code or update > Documentation/virtual/kvm/mmu.txt? Yes. it is. We missed to update mmu.txt for a long time. I will post a separate patchset to update it to the current mmu code. > Don't worry about the English, it is > more than understandable and I can help with the editing. Okay. Thank you in advance, Paolo! :) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
