KVM: x86: introduce is_pae_paging

Checking for 32-bit PAE is quite common around code that fiddles with
the PDPTRs.  Add a function to compress all checks into a single
invocation.

Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 3363fe1..524a13f 100644 (file)
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -961,8 +961,7 @@ static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, bool ne
                 * If PAE paging and EPT are both on, CR3 is not used by the CPU and
                 * must not be dereferenced.
                 */
-               if (!is_long_mode(vcpu) && is_pae(vcpu) && is_paging(vcpu) &&
-                   !nested_ept) {
+               if (is_pae_paging(vcpu) && !nested_ept) {
                        if (!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) {
                                *entry_failure_code = ENTRY_FAIL_PDPTE;
                                return -EINVAL;

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 6e414d6..a74936a 100644 (file)
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2767,7 +2767,7 @@ static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
                      (unsigned long *)&vcpu->arch.regs_dirty))
                return;
 
-       if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
+       if (is_pae_paging(vcpu)) {
                vmcs_write64(GUEST_PDPTR0, mmu->pdptrs[0]);
                vmcs_write64(GUEST_PDPTR1, mmu->pdptrs[1]);
                vmcs_write64(GUEST_PDPTR2, mmu->pdptrs[2]);
@@ -2779,7 +2779,7 @@ void ept_save_pdptrs(struct kvm_vcpu *vcpu)
 {
        struct kvm_mmu *mmu = vcpu->arch.walk_mmu;
 
-       if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
+       if (is_pae_paging(vcpu)) {
                mmu->pdptrs[0] = vmcs_read64(GUEST_PDPTR0);
                mmu->pdptrs[1] = vmcs_read64(GUEST_PDPTR1);
                mmu->pdptrs[2] = vmcs_read64(GUEST_PDPTR2);

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 848ca03..e536a2b 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -719,7 +719,7 @@ bool pdptrs_changed(struct kvm_vcpu *vcpu)
        gfn_t gfn;
        int r;
 
-       if (is_long_mode(vcpu) || !is_pae(vcpu) || !is_paging(vcpu))
+       if (!is_pae_paging(vcpu))
                return false;
 
        if (!test_bit(VCPU_EXREG_PDPTR,
@@ -962,8 +962,8 @@ int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
        if (is_long_mode(vcpu) &&
            (cr3 & rsvd_bits(cpuid_maxphyaddr(vcpu), 63)))
                return 1;
-       else if (is_pae(vcpu) && is_paging(vcpu) &&
-                  !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
+       else if (is_pae_paging(vcpu) &&
+                !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
                return 1;
 
        kvm_mmu_new_cr3(vcpu, cr3, skip_tlb_flush);
@@ -8596,7 +8596,7 @@ static int __set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
                kvm_update_cpuid(vcpu);
 
        idx = srcu_read_lock(&vcpu->kvm->srcu);
-       if (!is_long_mode(vcpu) && is_pae(vcpu) && is_paging(vcpu)) {
+       if (is_pae_paging(vcpu)) {
                load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
                mmu_reset_needed = 1;
        }

diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 275b3b6..e08a128 100644 (file)
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -139,6 +139,11 @@ static inline int is_paging(struct kvm_vcpu *vcpu)
        return likely(kvm_read_cr0_bits(vcpu, X86_CR0_PG));
 }
 
+static inline bool is_pae_paging(struct kvm_vcpu *vcpu)
+{
+       return !is_long_mode(vcpu) && is_pae(vcpu) && is_paging(vcpu);
+}
+
 static inline u32 bit(int bitno)
 {
        return 1 << (bitno & 31);