[Xen-devel] [PATCH v2 2/3] x86emul: raise #GP(0) in VME mode for POPF with TF set in new value

["Jan Beulich" <JBeulich@xxxxxxxx>]

This is a check explicitly listed by the instruction page in the SDM.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -4050,6 +4050,7 @@ x86_emulate(
             if ( (cr4 & X86_CR4_VME) &&
                  MASK_EXTR(_regs.eflags, X86_EFLAGS_IOPL) != 3 )
             {
+                generate_exception_if(dst.val & X86_EFLAGS_TF, EXC_GP, 0);
                 if ( dst.val & X86_EFLAGS_IF )
                 {
                     generate_exception_if(_regs.eflags & X86_EFLAGS_VIP,



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