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| author | Paolo Bonzini <pbonzini@redhat.com> | 2014-08-20 14:29:21 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-09-03 10:03:35 +0200 |
| commit | 00f034a12fdd81210d58116326d92780aac5c238 (patch) | |
| tree | 6e1eb1f40e9914fa801bf128f1eed19543f665c2 | |
| parent | KVM: x86: use guest maxphyaddr to check MTRR values (diff) | |
| download | linux-00f034a12fdd81210d58116326d92780aac5c238.tar.xz linux-00f034a12fdd81210d58116326d92780aac5c238.zip | |
KVM: do not bias the generation number in kvm_current_mmio_generation
The next patch will give a meaning (a la seqcount) to the low bit of the
generation number. Ensure that it matches between kvm->memslots->generation
and kvm_current_mmio_generation().
Cc: stable@vger.kernel.org
Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to '')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 7 | ||||
| -rw-r--r-- | virt/kvm/kvm_main.c | 7 |
2 files changed, 8 insertions, 6 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 931467881da7..323c3f5f5c84 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -236,12 +236,7 @@ static unsigned int get_mmio_spte_generation(u64 spte) static unsigned int kvm_current_mmio_generation(struct kvm *kvm) { - /* - * Init kvm generation close to MMIO_MAX_GEN to easily test the - * code of handling generation number wrap-around. - */ - return (kvm_memslots(kvm)->generation + - MMIO_MAX_GEN - 150) & MMIO_GEN_MASK; + return kvm_memslots(kvm)->generation & MMIO_GEN_MASK; } static void mark_mmio_spte(struct kvm *kvm, u64 *sptep, u64 gfn, diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 7176929a4cda..0bfdb673db26 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -477,6 +477,13 @@ static struct kvm *kvm_create_vm(unsigned long type) kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); if (!kvm->memslots) goto out_err_no_srcu; + + /* + * Init kvm generation close to the maximum to easily test the + * code of handling generation number wrap-around. + */ + kvm->memslots->generation = -150; + kvm_init_memslots_id(kvm); if (init_srcu_struct(&kvm->srcu)) goto out_err_no_srcu; |