From: Ștefan Șicleru <ssicleru@xxxxxxxxxxxxxxx>
Add a view mask for kvm_mmu_zap_all() in order to allow zapping
shadow pages for specific EPT views. This is required when an
introspected VM is unhooked. In that case, shadow pages that
belong to non-default views will be zapped.
Signed-off-by: Ștefan Șicleru <ssicleru@xxxxxxxxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 2 +-
arch/x86/kvm/mmu/mmu.c | 4 +++-
arch/x86/kvm/x86.c | 4 +++-
3 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 2fbb26b54cf1..519b8210b8ef 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1392,7 +1392,7 @@ void kvm_mmu_slot_set_dirty(struct kvm *kvm,
void kvm_mmu_clear_dirty_pt_masked(struct kvm *kvm,
struct kvm_memory_slot *slot,
gfn_t gfn_offset, unsigned long mask);
-void kvm_mmu_zap_all(struct kvm *kvm);
+void kvm_mmu_zap_all(struct kvm *kvm, u16 view_mask);
void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm, u64 gen);
unsigned long kvm_mmu_calculate_default_mmu_pages(struct kvm *kvm);
void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned long kvm_nr_mmu_pages);
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index cca12982b795..22c83192bba1 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6166,7 +6166,7 @@ void kvm_mmu_slot_set_dirty(struct kvm *kvm,
}
EXPORT_SYMBOL_GPL(kvm_mmu_slot_set_dirty);
-void kvm_mmu_zap_all(struct kvm *kvm)
+void kvm_mmu_zap_all(struct kvm *kvm, u16 view_mask)
{
struct kvm_mmu_page *sp, *node;
LIST_HEAD(invalid_list);
@@ -6175,6 +6175,8 @@ void kvm_mmu_zap_all(struct kvm *kvm)
spin_lock(&kvm->mmu_lock);
restart:
list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link) {
+ if (!test_bit(sp->view, (unsigned long *)&view_mask))
+ continue;
if (sp->role.invalid && sp->root_count)
continue;
if (__kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list, &ign))
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2e2c56a37bdb..78aacac839bb 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10406,7 +10406,9 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
void kvm_arch_flush_shadow_all(struct kvm *kvm)
{
- kvm_mmu_zap_all(kvm);
+ u16 ept_views_to_keep = 0;
+
+ kvm_mmu_zap_all(kvm, ~ept_views_to_keep);
}
void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
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