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| author | Junaid Shahid <junaids@google.com> | 2019-11-01 00:14:14 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-12 19:21:46 +0100 |
| commit | 46a4a014c48e64e28970ca775bb7adf4778821af (patch) | |
| tree | f542044defd8bb9fa70c3c736d32d0b3fe31d6d6 /arch/x86/include/asm | |
| parent | 6082f2e28887bcef66d9b3b5710fd3491a722f0b (diff) | |
| download | linux-stable-46a4a014c48e64e28970ca775bb7adf4778821af.tar.gz linux-stable-46a4a014c48e64e28970ca775bb7adf4778821af.tar.bz2 linux-stable-46a4a014c48e64e28970ca775bb7adf4778821af.zip | |
kvm: x86: mmu: Recovery of shattered NX large pages
commit 1aa9b9572b10529c2e64e2b8f44025d86e124308 upstream.
The page table pages corresponding to broken down large pages are zapped in
FIFO order, so that the large page can potentially be recovered, if it is
not longer being used for execution. This removes the performance penalty
for walking deeper EPT page tables.
By default, one large page will last about one hour once the guest
reaches a steady state.
Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 18fa1ba9e368..155be8adb934 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -281,6 +281,7 @@ struct kvm_rmap_head { struct kvm_mmu_page { struct list_head link; struct hlist_node hash_link; + struct list_head lpage_disallowed_link; /* * The following two entries are used to key the shadow page in the @@ -808,6 +809,7 @@ struct kvm_arch { */ struct list_head active_mmu_pages; struct list_head zapped_obsolete_pages; + struct list_head lpage_disallowed_mmu_pages; struct kvm_page_track_notifier_node mmu_sp_tracker; struct kvm_page_track_notifier_head track_notifier_head; @@ -878,6 +880,8 @@ struct kvm_arch { bool x2apic_broadcast_quirk_disabled; bool guest_can_read_msr_platform_info; + + struct task_struct *nx_lpage_recovery_thread; }; struct kvm_vm_stat { |