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| author | Avi Kivity <avi@redhat.com> | 2012-09-12 20:46:56 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-09-20 13:00:09 +0300 |
| commit | 6fd01b711bee96ce3356f7b6f370ab708e37504b (patch) | |
| tree | c277c3daf5ba0ec856e582025cbc27ccab4e6ec9 /arch/x86/kvm/paging_tmpl.h | |
| parent | 13d22b6aebb000aeaf137862c6c0e0c4d138d798 (diff) | |
| download | talos-op-linux-6fd01b711bee96ce3356f7b6f370ab708e37504b.tar.gz talos-op-linux-6fd01b711bee96ce3356f7b6f370ab708e37504b.zip | |
KVM: MMU: Optimize is_last_gpte()
Instead of branchy code depending on level, gpte.ps, and mmu configuration,
prepare everything in a bitmap during mode changes and look it up during
runtime.
Reviewed-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/paging_tmpl.h')
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 20 |
1 files changed, 1 insertions, 19 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 1b4c14d235a0..134ea7b1c585 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -103,24 +103,6 @@ static int FNAME(cmpxchg_gpte)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, return (ret != orig_pte); } -static bool FNAME(is_last_gpte)(struct guest_walker *walker, - struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, - pt_element_t gpte) -{ - if (walker->level == PT_PAGE_TABLE_LEVEL) - return true; - - if ((walker->level == PT_DIRECTORY_LEVEL) && is_large_pte(gpte) && - (PTTYPE == 64 || is_pse(vcpu))) - return true; - - if ((walker->level == PT_PDPE_LEVEL) && is_large_pte(gpte) && - (mmu->root_level == PT64_ROOT_LEVEL)) - return true; - - return false; -} - static int FNAME(update_accessed_dirty_bits)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, struct guest_walker *walker, @@ -247,7 +229,7 @@ retry_walk: pte_access = pt_access & gpte_access(vcpu, pte); walker->ptes[walker->level - 1] = pte; - } while (!FNAME(is_last_gpte)(walker, vcpu, mmu, pte)); + } while (!is_last_gpte(mmu, walker->level, pte)); eperm |= permission_fault(mmu, pte_access, access); if (unlikely(eperm)) { |
