diff options
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 10 | ||||
| -rw-r--r-- | arch/x86/include/asm/kvm_page_track.h | 13 | ||||
| -rw-r--r-- | arch/x86/kvm/Makefile | 3 | ||||
| -rw-r--r-- | arch/x86/kvm/page_track.c | 52 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 5 |
5 files changed, 82 insertions, 1 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 1f7fed5f35fc..71e43fe04bbc 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -32,6 +32,7 @@ #include <asm/mtrr.h> #include <asm/msr-index.h> #include <asm/asm.h> +#include <asm/kvm_page_track.h> #define KVM_MAX_VCPUS 255 #define KVM_SOFT_MAX_VCPUS 160 @@ -214,6 +215,14 @@ struct kvm_mmu_memory_cache { void *objects[KVM_NR_MEM_OBJS]; }; +/* + * the pages used as guest page table on soft mmu are tracked by + * kvm_memory_slot.arch.gfn_track which is 16 bits, so the role bits used + * by indirect shadow page can not be more than 15 bits. + * + * Currently, we used 14 bits that are @level, @cr4_pae, @quadrant, @access, + * @nxe, @cr0_wp, @smep_andnot_wp and @smap_andnot_wp. + */ union kvm_mmu_page_role { unsigned word; struct { @@ -650,6 +659,7 @@ struct kvm_lpage_info { struct kvm_arch_memory_slot { struct kvm_rmap_head *rmap[KVM_NR_PAGE_SIZES]; struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1]; + unsigned short *gfn_track[KVM_PAGE_TRACK_MAX]; }; /* diff --git a/arch/x86/include/asm/kvm_page_track.h b/arch/x86/include/asm/kvm_page_track.h new file mode 100644 index 000000000000..5520040682d1 --- /dev/null +++ b/arch/x86/include/asm/kvm_page_track.h @@ -0,0 +1,13 @@ +#ifndef _ASM_X86_KVM_PAGE_TRACK_H +#define _ASM_X86_KVM_PAGE_TRACK_H + +enum kvm_page_track_mode { + KVM_PAGE_TRACK_WRITE, + KVM_PAGE_TRACK_MAX, +}; + +void kvm_page_track_free_memslot(struct kvm_memory_slot *free, + struct kvm_memory_slot *dont); +int kvm_page_track_create_memslot(struct kvm_memory_slot *slot, + unsigned long npages); +#endif diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile index a1ff508bb423..464fa477afbf 100644 --- a/arch/x86/kvm/Makefile +++ b/arch/x86/kvm/Makefile @@ -13,9 +13,10 @@ kvm-$(CONFIG_KVM_ASYNC_PF) += $(KVM)/async_pf.o kvm-y += x86.o mmu.o emulate.o i8259.o irq.o lapic.o \ i8254.o ioapic.o irq_comm.o cpuid.o pmu.o mtrr.o \ - hyperv.o + hyperv.o page_track.o kvm-$(CONFIG_KVM_DEVICE_ASSIGNMENT) += assigned-dev.o iommu.o + kvm-intel-y += vmx.o pmu_intel.o kvm-amd-y += svm.o pmu_amd.o diff --git a/arch/x86/kvm/page_track.c b/arch/x86/kvm/page_track.c new file mode 100644 index 000000000000..8c396d08c0a4 --- /dev/null +++ b/arch/x86/kvm/page_track.c @@ -0,0 +1,52 @@ +/* + * Support KVM gust page tracking + * + * This feature allows us to track page access in guest. Currently, only + * write access is tracked. + * + * Copyright(C) 2015 Intel Corporation. + * + * Author: + * Xiao Guangrong <guangrong.xiao@linux.intel.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + */ + +#include <linux/kvm_host.h> +#include <asm/kvm_host.h> +#include <asm/kvm_page_track.h> + +#include "mmu.h" + +void kvm_page_track_free_memslot(struct kvm_memory_slot *free, + struct kvm_memory_slot *dont) +{ + int i; + + for (i = 0; i < KVM_PAGE_TRACK_MAX; i++) + if (!dont || free->arch.gfn_track[i] != + dont->arch.gfn_track[i]) { + kvfree(free->arch.gfn_track[i]); + free->arch.gfn_track[i] = NULL; + } +} + +int kvm_page_track_create_memslot(struct kvm_memory_slot *slot, + unsigned long npages) +{ + int i; + + for (i = 0; i < KVM_PAGE_TRACK_MAX; i++) { + slot->arch.gfn_track[i] = kvm_kvzalloc(npages * + sizeof(*slot->arch.gfn_track[i])); + if (!slot->arch.gfn_track[i]) + goto track_free; + } + + return 0; + +track_free: + kvm_page_track_free_memslot(slot, NULL); + return -ENOMEM; +} diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 668625e47102..7b4cfea09deb 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -7871,6 +7871,8 @@ void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, free->arch.lpage_info[i - 1] = NULL; } } + + kvm_page_track_free_memslot(free, dont); } int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, @@ -7919,6 +7921,9 @@ int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, } } + if (kvm_page_track_create_memslot(slot, npages)) + goto out_free; + return 0; out_free: |