Return-Path: From: Sasha Levin To: stable@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Liran Alon , Paolo Bonzini , Sasha Levin Subject: [PATCH AUTOSEL 4.18 059/100] KVM: nVMX: Fix emulation of VM_ENTRY_LOAD_BNDCFGS Date: Tue, 16 Oct 2018 00:11:40 -0400 Message-Id: <20181016041221.135528-59-sashal@kernel.org> In-Reply-To: <20181016041221.135528-1-sashal@kernel.org> References: <20181016041221.135528-1-sashal@kernel.org> List-ID: From: Liran Alon [ Upstream commit 62cf9bd8118c4009f02c477ef78c723f49e53e16 ] L2 IA32_BNDCFGS should be updated with vmcs12->guest_bndcfgs only when VM_ENTRY_LOAD_BNDCFGS is specified in vmcs12->vm_entry_controls. Otherwise, L2 IA32_BNDCFGS should be set to vmcs01->guest_bndcfgs which is L1 IA32_BNDCFGS. Reviewed-by: Nikita Leshchenko Reviewed-by: Darren Kenny Signed-off-by: Liran Alon Signed-off-by: Paolo Bonzini Signed-off-by: Sasha Levin --- arch/x86/kvm/vmx.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 2e23fce5eb1f..9efe130ea2e6 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -819,6 +819,7 @@ struct nested_vmx { /* to migrate it to L2 if VM_ENTRY_LOAD_DEBUG_CONTROLS is off */ u64 vmcs01_debugctl; + u64 vmcs01_guest_bndcfgs; u16 vpid02; u16 last_vpid; @@ -11567,8 +11568,13 @@ static void prepare_vmcs02_full(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12) set_cr4_guest_host_mask(vmx); - if (kvm_mpx_supported()) - vmcs_write64(GUEST_BNDCFGS, vmcs12->guest_bndcfgs); + if (kvm_mpx_supported()) { + if (vmx->nested.nested_run_pending && + (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS)) + vmcs_write64(GUEST_BNDCFGS, vmcs12->guest_bndcfgs); + else + vmcs_write64(GUEST_BNDCFGS, vmx->nested.vmcs01_guest_bndcfgs); + } if (enable_vpid) { if (nested_cpu_has_vpid(vmcs12) && vmx->nested.vpid02) @@ -12082,6 +12088,9 @@ static int enter_vmx_non_root_mode(struct kvm_vcpu *vcpu) if (!(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS)) vmx->nested.vmcs01_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL); + if (kvm_mpx_supported() && + !(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS)) + vmx->nested.vmcs01_guest_bndcfgs = vmcs_read64(GUEST_BNDCFGS); vmx_switch_vmcs(vcpu, &vmx->nested.vmcs02); vmx_segment_cache_clear(vmx); -- 2.17.1