They're being zeroed a few lines down when non-null selectors are being
found in the respective registers.
Signed-off-by: Jan Beulich <jbeul...@suse.com>
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -1449,10 +1449,11 @@ static void save_segments(struct vcpu *v
if ( cpu_has_fsgsbase && !is_pv_32bit_vcpu(v) )
{
- v->arch.pv_vcpu.fs_base = __rdfsbase();
+ if ( !(regs->fs & ~3) )
+ v->arch.pv_vcpu.fs_base = __rdfsbase();
if ( v->arch.flags & TF_kernel_mode )
v->arch.pv_vcpu.gs_base_kernel = __rdgsbase();
- else
+ else if ( !(regs->gs & ~3) )
v->arch.pv_vcpu.gs_base_user = __rdgsbase();
}
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