diff options
| author | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2019-11-12 16:35:06 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-01-30 18:45:54 +0100 |
| commit | 1eff70a9abd46f175defafd29bc17ad456f398a7 (patch) | |
| tree | 977d32b00d6c75b404fb7b131d89f9e5de9021cd /virt/kvm | |
| parent | 8c6de56a42e0c657955e12b882a81ef07d1d073e (diff) | |
| download | linux-1eff70a9abd46f175defafd29bc17ad456f398a7.tar.gz linux-1eff70a9abd46f175defafd29bc17ad456f398a7.tar.bz2 linux-1eff70a9abd46f175defafd29bc17ad456f398a7.zip | |
x86/kvm: Introduce kvm_(un)map_gfn()
kvm_vcpu_(un)map operates on gfns from any current address space.
In certain cases we want to make sure we are not mapping SMRAM
and for that we can use kvm_(un)map_gfn() that we are introducing
in this patch.
This is part of CVE-2019-3016.
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt/kvm')
| -rw-r--r-- | virt/kvm/kvm_main.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 00268290dcbd..9ef58a233a7c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1821,12 +1821,13 @@ struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) } EXPORT_SYMBOL_GPL(gfn_to_page); -static int __kvm_map_gfn(struct kvm_memory_slot *slot, gfn_t gfn, +static int __kvm_map_gfn(struct kvm_memslots *slots, gfn_t gfn, struct kvm_host_map *map) { kvm_pfn_t pfn; void *hva = NULL; struct page *page = KVM_UNMAPPED_PAGE; + struct kvm_memory_slot *slot = __gfn_to_memslot(slots, gfn); if (!map) return -EINVAL; @@ -1855,14 +1856,20 @@ static int __kvm_map_gfn(struct kvm_memory_slot *slot, gfn_t gfn, return 0; } +int kvm_map_gfn(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map) +{ + return __kvm_map_gfn(kvm_memslots(vcpu->kvm), gfn, map); +} +EXPORT_SYMBOL_GPL(kvm_map_gfn); + int kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map) { - return __kvm_map_gfn(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, map); + return __kvm_map_gfn(kvm_vcpu_memslots(vcpu), gfn, map); } EXPORT_SYMBOL_GPL(kvm_vcpu_map); -void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, - bool dirty) +static void __kvm_unmap_gfn(struct kvm_memory_slot *memslot, + struct kvm_host_map *map, bool dirty) { if (!map) return; @@ -1878,7 +1885,7 @@ void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, #endif if (dirty) { - kvm_vcpu_mark_page_dirty(vcpu, map->gfn); + mark_page_dirty_in_slot(memslot, map->gfn); kvm_release_pfn_dirty(map->pfn); } else { kvm_release_pfn_clean(map->pfn); @@ -1887,6 +1894,18 @@ void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, map->hva = NULL; map->page = NULL; } + +int kvm_unmap_gfn(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty) +{ + __kvm_unmap_gfn(gfn_to_memslot(vcpu->kvm, map->gfn), map, dirty); + return 0; +} +EXPORT_SYMBOL_GPL(kvm_unmap_gfn); + +void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty) +{ + __kvm_unmap_gfn(kvm_vcpu_gfn_to_memslot(vcpu, map->gfn), map, dirty); +} EXPORT_SYMBOL_GPL(kvm_vcpu_unmap); struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn) |