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Message-ID: <54227EB4.7070608@redhat.com> Date: Wed, 24 Sep 2014 10:20:04 +0200 From: Paolo Bonzini <pbonzini@...hat.com> To: Tang Chen <tangchen@...fujitsu.com>, gleb@...nel.org, mtosatti@...hat.com, nadav.amit@...il.com, jan.kiszka@....de CC: kvm@...r.kernel.org, laijs@...fujitsu.com, isimatu.yasuaki@...fujitsu.com, guz.fnst@...fujitsu.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH v8 0/8] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page. Il 24/09/2014 09:57, Tang Chen ha scritto: > ept identity pagetable and apic access page in kvm are pinned in memory. > As a result, they cannot be migrated/hot-removed. > > But actually they don't need to be pinned in memory. > > [For ept identity page] > Just do not pin it. When it is migrated, guest will be able to find the > new page in the next ept violation. > > [For apic access page] > The hpa of apic access page is stored in VMCS APIC_ACCESS_ADDR pointer. > When apic access page is migrated, we update VMCS APIC_ACCESS_ADDR pointer > for each vcpu in addition. > > This patch-set is based on Linux 3.17.0-rc5. > > NOTE: Tested with -cpu xxx,-x2apic option. > But since nested vm pins some other pages in memory, if user uses nested > vm, memory hot-remove will not work. > > Change log v7->v8: > 1. Patch 1/9~3/9 were applied to kvm/queue by Paolo Bonzini <pbonzini@...hat.com>. > Just resend them, no changes. > 2. Removed previous patch 4/9, which added unnecessary hook has_secondary_apic_access(). > 3. Set kvm_x86_ops->set_apic_access_page_addr to NULL when hardware had no flexpriority > functionality which actually exists only on x86. > 4. Moved declaration of kvm_arch_mmu_notifier_invalidate_page() to arch/*/include/asm/kvm_host.h. > 5. Removed useless set_apic_access_page_addr() hook for svm. > > Tang Chen (8): > kvm: Use APIC_DEFAULT_PHYS_BASE macro as the apic access page address. > kvm: Remove ept_identity_pagetable from struct kvm_arch. > kvm: Make init_rmode_identity_map() return 0 on success. > kvm, mem-hotplug: Reload L1's apic access page in vcpu_enter_guest(). > kvm: Rename make_all_cpus_request() to kvm_make_all_cpus_request() and > make it non-static. > kvm, mem-hotplug: Reload L1's apic access page on migration when L2 is > running. > kvm, mem-hotplug: Add arch specific mmu notifier to handle apic access > migration. > kvm, mem-hotplug: Unpin and remove kvm_arch->apic_access_page. > > arch/arm/include/asm/kvm_host.h | 5 ++ > arch/arm64/include/asm/kvm_host.h | 5 ++ > arch/ia64/include/asm/kvm_host.h | 7 ++ > arch/mips/include/asm/kvm_host.h | 6 ++ > arch/powerpc/include/asm/kvm_host.h | 5 ++ > arch/s390/include/asm/kvm_host.h | 8 +++ > arch/x86/include/asm/kvm_host.h | 7 +- > arch/x86/kvm/svm.c | 3 +- > arch/x86/kvm/vmx.c | 130 ++++++++++++++++++++++++------------ > arch/x86/kvm/x86.c | 45 +++++++++++-- > include/linux/kvm_host.h | 2 + > virt/kvm/kvm_main.c | 13 ++-- > 12 files changed, 180 insertions(+), 56 deletions(-) > Thanks for your persistence! The patches look good, I'll test them and apply to kvm/queue. Paolo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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