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authorXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>2013-06-07 08:51:26 (GMT)
committerGleb Natapov <gleb@redhat.com>2013-06-27 11:20:36 (GMT)
commitf8f559422b6c6a05469dfde614b67789b6142cb5 (patch)
tree6a20c82079581d5af9a9e8d4ca83bc2266e01f21 /arch/x86/kvm/paging_tmpl.h
parentb37fbea6cefc3a8ff7b6cfec9867432d1a10046d (diff)
downloadlinux-f8f559422b6c6a05469dfde614b67789b6142cb5.tar.xz
KVM: MMU: fast invalidate all mmio sptes
This patch tries to introduce a very simple and scale way to invalidate all mmio sptes - it need not walk any shadow pages and hold mmu-lock KVM maintains a global mmio valid generation-number which is stored in kvm->memslots.generation and every mmio spte stores the current global generation-number into his available bits when it is created When KVM need zap all mmio sptes, it just simply increase the global generation-number. When guests do mmio access, KVM intercepts a MMIO #PF then it walks the shadow page table and get the mmio spte. If the generation-number on the spte does not equal the global generation-number, it will go to the normal #PF handler to update the mmio spte Since 19 bits are used to store generation-number on mmio spte, we zap all mmio sptes when the number is round Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Reviewed-by: Gleb Natapov <gleb@redhat.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/paging_tmpl.h')
-rw-r--r--arch/x86/kvm/paging_tmpl.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index fb50fa6..7769699 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -552,9 +552,12 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code,
pgprintk("%s: addr %lx err %x\n", __func__, addr, error_code);
- if (unlikely(error_code & PFERR_RSVD_MASK))
- return handle_mmio_page_fault(vcpu, addr, error_code,
+ if (unlikely(error_code & PFERR_RSVD_MASK)) {
+ r = handle_mmio_page_fault(vcpu, addr, error_code,
mmu_is_nested(vcpu));
+ if (likely(r != RET_MMIO_PF_INVALID))
+ return r;
+ };
r = mmu_topup_memory_caches(vcpu);
if (r)