From: Avi Kivity Date: Tue, 19 Oct 2010 16:48:35 +0000 (+0200) Subject: KVM: Correct ordering of ldt reload wrt fs/gs reload X-Git-Tag: firefly_0821_release~9833^2~79^2^2~140 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a700b4efaa3451c9fe0ddfb57c9024e8ad767c47;p=firefly-linux-kernel-4.4.55.git KVM: Correct ordering of ldt reload wrt fs/gs reload commit 0a77fe4c188e25917799f2356d4aa5e6d80c39a2 upstream. If fs or gs refer to the ldt, they must be reloaded after the ldt. Reorder the code to that effect. Userspace code that uses the ldt with kvm is nonexistent, so this doesn't fix a user-visible bug. Signed-off-by: Avi Kivity Signed-off-by: Marcelo Tosatti Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 2a02a659f1f4..89055e002137 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -3281,6 +3281,7 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu) vcpu->arch.regs[VCPU_REGS_RIP] = svm->vmcb->save.rip; load_host_msrs(vcpu); + kvm_load_ldt(ldt_selector); loadsegment(fs, fs_selector); #ifdef CONFIG_X86_64 load_gs_index(gs_selector); @@ -3288,7 +3289,6 @@ static void svm_vcpu_run(struct kvm_vcpu *vcpu) #else loadsegment(gs, gs_selector); #endif - kvm_load_ldt(ldt_selector); reload_tss(vcpu); diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 7bddfab12013..f6ce8bf00c38 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -846,8 +846,6 @@ static void __vmx_load_host_state(struct vcpu_vmx *vmx) ++vmx->vcpu.stat.host_state_reload; vmx->host_state.loaded = 0; - if (vmx->host_state.fs_reload_needed) - loadsegment(fs, vmx->host_state.fs_sel); if (vmx->host_state.gs_ldt_reload_needed) { kvm_load_ldt(vmx->host_state.ldt_sel); #ifdef CONFIG_X86_64 @@ -857,6 +855,8 @@ static void __vmx_load_host_state(struct vcpu_vmx *vmx) loadsegment(gs, vmx->host_state.gs_sel); #endif } + if (vmx->host_state.fs_reload_needed) + loadsegment(fs, vmx->host_state.fs_sel); reload_tss(); #ifdef CONFIG_X86_64 if (is_long_mode(&vmx->vcpu)) {