KVM: allow access to EFER in 32bit KVM

This patch makes the EFER register accessible on a 32bit KVM host. This is
necessary to boot 32 bit PAE guests under SVM.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index db16f23..38edb2f 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -432,8 +432,6 @@ static u32 emulated_msrs[] = {
        MSR_IA32_MISC_ENABLE,
 };
 
-#ifdef CONFIG_X86_64
-
 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
 {
        if (efer & efer_reserved_bits) {
@@ -458,8 +456,6 @@ static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
        vcpu->arch.shadow_efer = efer;
 }
 
-#endif
-
 void kvm_enable_efer_bits(u64 mask)
 {
        efer_reserved_bits &= ~mask;
@@ -489,11 +485,9 @@ static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
 {
        switch (msr) {
-#ifdef CONFIG_X86_64
        case MSR_EFER:
                set_efer(vcpu, data);
                break;
-#endif
        case MSR_IA32_MC0_STATUS:
                pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
                       __FUNCTION__, data);
@@ -571,11 +565,9 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
        case MSR_IA32_MISC_ENABLE:
                data = vcpu->arch.ia32_misc_enable_msr;
                break;
-#ifdef CONFIG_X86_64
        case MSR_EFER:
                data = vcpu->arch.shadow_efer;
                break;
-#endif
        default:
                pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
                return 1;
@@ -2880,9 +2872,7 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
        set_cr8(vcpu, sregs->cr8);
 
        mmu_reset_needed |= vcpu->arch.shadow_efer != sregs->efer;
-#ifdef CONFIG_X86_64
        kvm_x86_ops->set_efer(vcpu, sregs->efer);
-#endif
        kvm_set_apic_base(vcpu, sregs->apic_base);
 
        kvm_x86_ops->decache_cr4_guest_bits(vcpu);