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Message-ID: <54227FF6.10109@cn.fujitsu.com> Date: Wed, 24 Sep 2014 16:25:26 +0800 From: Tang Chen <tangchen@...fujitsu.com> To: Paolo Bonzini <pbonzini@...hat.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>, <tangchen@...fujitsu.com> Subject: Re: [PATCH v8 0/8] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page. On 09/24/2014 04:20 PM, Paolo Bonzini wrote: > 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. Sure, thank you very much. :) -- 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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