The avx512_vlen_check() invocation needs to be conditional.
Signed-off-by: Jan Beulich <[email protected]>
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -6179,7 +6179,8 @@ x86_emulate(
evex.w != evex.pfx),
EXC_UD);
host_and_vcpu_must_have(avx512f);
- avx512_vlen_check(true);
+ if ( !evex.br )
+ avx512_vlen_check(true);
get_fpu(X86EMUL_FPU_zmm);
opc = init_evex(stub);
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