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| author | Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> | 2013-06-07 08:51:28 (GMT) |
|---|---|---|
| committer | Gleb Natapov <gleb@redhat.com> | 2013-06-27 11:20:39 (GMT) |
| commit | 69c9ea93eaea95e3a2c5f1a0cf77b02c58979b9a (patch) | |
| tree | 7922cd8a8027ba17eda3538eb6c7f43cb505c612 | |
| parent | 089504c0d40a24fe37a108c0eda16a9e7b846f12 (diff) | |
| download | linux-69c9ea93eaea95e3a2c5f1a0cf77b02c58979b9a.tar.xz | |
KVM: MMU: init kvm generation close to mmio wrap-around value
Then it has the chance to trigger mmio generation number wrap-around
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
[Change from MMIO_MAX_GEN - 13 to MMIO_MAX_GEN - 150, because 13 is
very close to the number of calls to KVM_SET_USER_MEMORY_REGION
before the guest is started and there is any chance to create any
spte. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/mmu.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 417f36b..c212101 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -235,7 +235,12 @@ static unsigned int get_mmio_spte_generation(u64 spte) static unsigned int kvm_current_mmio_generation(struct kvm *kvm) { - return kvm_memslots(kvm)->generation & MMIO_GEN_MASK; + /* + * 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; } static void mark_mmio_spte(struct kvm *kvm, u64 *sptep, u64 gfn, |