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| author | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2019-11-12 19:35:06 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-04-29 17:31:19 +0300 |
| commit | e36d68ec5090599058650152547d4a58ef3d79a0 (patch) | |
| tree | 0f5eab075790a3446ccfdc53a8bd2680672c5e75 /virt | |
| parent | ec81ed2fba221b8bb92b8010e82d92e1de3b39fa (diff) | |
| download | linux-e36d68ec5090599058650152547d4a58ef3d79a0.tar.xz | |
x86/kvm: Introduce kvm_(un)map_gfn()
commit 1eff70a9abd46f175defafd29bc17ad456f398a7 upstream.
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>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'virt')
| -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 33b288469c70..8e29b2e0bf2e 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1705,12 +1705,13 @@ 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; @@ -1739,14 +1740,20 @@ 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; @@ -1762,7 +1769,7 @@ 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); @@ -1771,6 +1778,18 @@ 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) |