diff --git a/hypervisor/arch/x86/guest/vcpu.c b/hypervisor/arch/x86/guest/vcpu.c
index e87fe1567..512cb2cc6 100644
--- a/hypervisor/arch/x86/guest/vcpu.c
+++ b/hypervisor/arch/x86/guest/vcpu.c
@@ -845,6 +845,7 @@ static void context_switch_out(struct thread_object *prev)
 
 	/* We don't flush TLB as we assume each vcpu has different vpid */
 	ectx->ia32_star = msr_read(MSR_IA32_STAR);
+	ectx->ia32_cstar = msr_read(MSR_IA32_CSTAR);
 	ectx->ia32_lstar = msr_read(MSR_IA32_LSTAR);
 	ectx->ia32_fmask = msr_read(MSR_IA32_FMASK);
 	ectx->ia32_kernel_gs_base = msr_read(MSR_IA32_KERNEL_GS_BASE);
@@ -860,6 +861,7 @@ static void context_switch_in(struct thread_object *next)
 	load_vmcs(vcpu);
 
 	msr_write(MSR_IA32_STAR, ectx->ia32_star);
+	msr_write(MSR_IA32_CSTAR, ectx->ia32_cstar);
 	msr_write(MSR_IA32_LSTAR, ectx->ia32_lstar);
 	msr_write(MSR_IA32_FMASK, ectx->ia32_fmask);
 	msr_write(MSR_IA32_KERNEL_GS_BASE, ectx->ia32_kernel_gs_base);
diff --git a/hypervisor/include/arch/x86/cpu.h b/hypervisor/include/arch/x86/cpu.h
index e8f253c8d..1ee00f4bb 100644
--- a/hypervisor/include/arch/x86/cpu.h
+++ b/hypervisor/include/arch/x86/cpu.h
@@ -392,6 +392,7 @@ struct ext_context {
 	struct segment_sel gs;
 
 	uint64_t ia32_star;
+	uint64_t ia32_cstar;
 	uint64_t ia32_lstar;
 	uint64_t ia32_fmask;
 	uint64_t ia32_kernel_gs_base;