From 541dcd2a44983181004ce74f5f5896287677990b Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Mon, 19 Oct 2015 11:30:19 +0200 Subject: [PATCH] kvm: x86: zero EFER on INIT Not zeroing EFER means that a 32-bit firmware cannot enter paging mode without clearing EFER.LME first (which it should not know about). Yang Zhang from Intel confirmed that the manual is wrong and EFER is cleared to zero on INIT. Fixes: 6732863845a57d8197cb1d2254d9328b91356a20 Cc: stable@vger.kernel.org Cc: Yang Z Zhang Signed-off-by: Paolo Bonzini --- arch/x86/kvm/svm.c | 11 +++++------ arch/x86/kvm/vmx.c | 3 +-- 2 files changed, 6 insertions(+), 8 deletions(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index cd8659cfc632b..f2c8e4917688a 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1089,7 +1089,7 @@ static u64 svm_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc) return target_tsc - tsc; } -static void init_vmcb(struct vcpu_svm *svm, bool init_event) +static void init_vmcb(struct vcpu_svm *svm) { struct vmcb_control_area *control = &svm->vmcb->control; struct vmcb_save_area *save = &svm->vmcb->save; @@ -1160,8 +1160,7 @@ static void init_vmcb(struct vcpu_svm *svm, bool init_event) init_sys_seg(&save->ldtr, SEG_TYPE_LDT); init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16); - if (!init_event) - svm_set_efer(&svm->vcpu, 0); + svm_set_efer(&svm->vcpu, 0); save->dr6 = 0xffff0ff0; kvm_set_rflags(&svm->vcpu, 2); save->rip = 0x0000fff0; @@ -1215,7 +1214,7 @@ static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) if (kvm_vcpu_is_reset_bsp(&svm->vcpu)) svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP; } - init_vmcb(svm, init_event); + init_vmcb(svm); kvm_cpuid(vcpu, &eax, &dummy, &dummy, &dummy); kvm_register_write(vcpu, VCPU_REGS_RDX, eax); @@ -1271,7 +1270,7 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id) clear_page(svm->vmcb); svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT; svm->asid_generation = 0; - init_vmcb(svm, false); + init_vmcb(svm); svm_init_osvw(&svm->vcpu); @@ -1893,7 +1892,7 @@ static int shutdown_interception(struct vcpu_svm *svm) * so reinitialize it. */ clear_page(svm->vmcb); - init_vmcb(svm, false); + init_vmcb(svm); kvm_run->exit_reason = KVM_EXIT_SHUTDOWN; return 0; diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 15bff51d492ab..4d0aa31a42baa 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -4932,8 +4932,7 @@ static void vmx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event) vmx_set_cr0(vcpu, cr0); /* enter rmode */ vmx->vcpu.arch.cr0 = cr0; vmx_set_cr4(vcpu, 0); - if (!init_event) - vmx_set_efer(vcpu, 0); + vmx_set_efer(vcpu, 0); vmx_fpu_activate(vcpu); update_exception_bitmap(vcpu); -- 2.39.5