Re: [PATCH v4 0/6] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page.
Hi Gleb, Would you please help to review these patches ? Thanks. On 08/27/2014 06:17 PM, Tang Chen wrote: 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. 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 v3 -> v4: 1. The original patch 6 is now patch 5. ( by Jan Kiszka ) 2. The original patch 1 is now patch 6 since we should unpin apic access page at the very last moment. Tang Chen (6): 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' apic access page on migration in vcpu_enter_guest(). kvm, mem-hotplug: Reload L1's apic access page on migration when L2 is running. kvm, mem-hotplug: Do not pin apic access page in memory. arch/x86/include/asm/kvm_host.h | 3 +- arch/x86/kvm/svm.c | 15 +- arch/x86/kvm/vmx.c | 103 +++- arch/x86/kvm/x86.c | 22 +++-- include/linux/kvm_host.h| 3 ++ virt/kvm/kvm_main.c | 30 +++- 6 files changed, 135 insertions(+), 41 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH v4 0/6] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page.
Hi Gleb, Would you please help to review these patches ? Thanks. On 08/27/2014 06:17 PM, Tang Chen wrote: 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. 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 v3 - v4: 1. The original patch 6 is now patch 5. ( by Jan Kiszka jan.kis...@web.de ) 2. The original patch 1 is now patch 6 since we should unpin apic access page at the very last moment. Tang Chen (6): 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' apic access page on migration in vcpu_enter_guest(). kvm, mem-hotplug: Reload L1's apic access page on migration when L2 is running. kvm, mem-hotplug: Do not pin apic access page in memory. arch/x86/include/asm/kvm_host.h | 3 +- arch/x86/kvm/svm.c | 15 +- arch/x86/kvm/vmx.c | 103 +++- arch/x86/kvm/x86.c | 22 +++-- include/linux/kvm_host.h| 3 ++ virt/kvm/kvm_main.c | 30 +++- 6 files changed, 135 insertions(+), 41 deletions(-) -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH v4 0/6] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page.
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. 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 v3 -> v4: 1. The original patch 6 is now patch 5. ( by Jan Kiszka ) 2. The original patch 1 is now patch 6 since we should unpin apic access page at the very last moment. Tang Chen (6): 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' apic access page on migration in vcpu_enter_guest(). kvm, mem-hotplug: Reload L1's apic access page on migration when L2 is running. kvm, mem-hotplug: Do not pin apic access page in memory. arch/x86/include/asm/kvm_host.h | 3 +- arch/x86/kvm/svm.c | 15 +- arch/x86/kvm/vmx.c | 103 +++- arch/x86/kvm/x86.c | 22 +++-- include/linux/kvm_host.h| 3 ++ virt/kvm/kvm_main.c | 30 +++- 6 files changed, 135 insertions(+), 41 deletions(-) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH v4 0/6] kvm, mem-hotplug: Do not pin ept identity pagetable and apic access page.
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. 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 v3 - v4: 1. The original patch 6 is now patch 5. ( by Jan Kiszka jan.kis...@web.de ) 2. The original patch 1 is now patch 6 since we should unpin apic access page at the very last moment. Tang Chen (6): 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' apic access page on migration in vcpu_enter_guest(). kvm, mem-hotplug: Reload L1's apic access page on migration when L2 is running. kvm, mem-hotplug: Do not pin apic access page in memory. arch/x86/include/asm/kvm_host.h | 3 +- arch/x86/kvm/svm.c | 15 +- arch/x86/kvm/vmx.c | 103 +++- arch/x86/kvm/x86.c | 22 +++-- include/linux/kvm_host.h| 3 ++ virt/kvm/kvm_main.c | 30 +++- 6 files changed, 135 insertions(+), 41 deletions(-) -- 1.8.3.1 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
