target/i386: EPYC-Rome model without XSAVES

Based on the kernel commit "b0563468ee x86/CPU/AMD: Disable XSAVES on
AMD family 0x17", host system with EPYC-Rome can clear XSAVES capability
bit. In another words, EPYC-Rome host without XSAVES can occur. Thus, we
need an EPYC-Rome cpu model (without this feature) that matches the
solution of fixing this erratum

Signed-off-by: Maksim Davydov <davydov-max@yandex-team.ru>
Message-Id: <20230524213748.8918-1-davydov-max@yandex-team.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

target/i386/cpu.c

@@ -4466,6 +4466,16 @@ static const X86CPUDefinition builtin_x86_defs[] = {
                 },
                 .cache_info = &epyc_rome_v3_cache_info
             },
+            {
+                .version = 4,
+                .props = (PropValue[]) {
+                    /* Erratum 1386 */
+                    { "model-id",
+                      "AMD EPYC-Rome-v4 Processor (no XSAVES)" },
+                    { "xsaves", "off" },
+                    { /* end of list */ }
+                },
+            },
             { /* end of list */ }
         }
     },