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Thu, 06 Jan 2022 14:33:19 -0800 (PST) Date: Thu, 6 Jan 2022 14:33:16 -0800 Message-Id: <20220106223316.3661625-1-venture@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.34.1.448.ga2b2bfdf31-goog Subject: [PATCH] hw/smbios: Add table 4 parameter, "processor-id" From: Patrick Venture To: mst@redhat.com, imammedo@redhat.com, ani@anisinha.ca Cc: qemu-devel@nongnu.org, Patrick Venture , Peter Foley , Titus Rwantare X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::349 (failed) Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::349; envelope-from=3L27XYQcKCn4xgpvwtgiqqing.eqosgow-fgxgnpqpipw.qti@flex--venture.bounces.google.com; helo=mail-ot1-x349.google.com X-Spam_score_int: -87 X-Spam_score: -8.8 X-Spam_bar: -------- X-Spam_report: (-8.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @google.com) X-ZM-MESSAGEID: 1641508899576100001 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This parameter is to be used in the processor_id lower 32-bit entry in the type 4 table. The upper 32-bits represent the features for the CPU. This patch leaves those as 0 when the lower 32-bits are set. This parameter is set as optional and if left will use the values from the CPU model. This enables hiding the host information from the guest and allowing AMD VMs to run pretending to be Intel for some userspace software concerns. Reviewed-by: Peter Foley Reviewed-by: Titus Rwantare Signed-off-by: Patrick Venture --- hw/smbios/smbios.c | 19 ++++++++++++++++--- qemu-options.hx | 1 + 2 files changed, 17 insertions(+), 3 deletions(-) diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c index 7397e56737..0553ee0b17 100644 --- a/hw/smbios/smbios.c +++ b/hw/smbios/smbios.c @@ -104,9 +104,11 @@ static struct { const char *sock_pfx, *manufacturer, *version, *serial, *asset, *part; uint64_t max_speed; uint64_t current_speed; + uint32_t processor_id; } type4 =3D { .max_speed =3D DEFAULT_CPU_SPEED, - .current_speed =3D DEFAULT_CPU_SPEED + .current_speed =3D DEFAULT_CPU_SPEED, + .processor_id =3D 0, }; =20 static struct { @@ -327,6 +329,10 @@ static const QemuOptDesc qemu_smbios_type4_opts[] =3D { .name =3D "part", .type =3D QEMU_OPT_STRING, .help =3D "part number", + }, { + .name =3D "processor-id", + .type =3D QEMU_OPT_NUMBER, + .help =3D "processor id", }, { /* end of list */ } }; @@ -669,8 +675,13 @@ static void smbios_build_type_4_table(MachineState *ms= , unsigned instance) t->processor_type =3D 0x03; /* CPU */ t->processor_family =3D 0x01; /* Other */ SMBIOS_TABLE_SET_STR(4, processor_manufacturer_str, type4.manufacturer= ); - t->processor_id[0] =3D cpu_to_le32(smbios_cpuid_version); - t->processor_id[1] =3D cpu_to_le32(smbios_cpuid_features); + if (type4.processor_id =3D=3D 0) { + t->processor_id[0] =3D cpu_to_le32(smbios_cpuid_version); + t->processor_id[1] =3D cpu_to_le32(smbios_cpuid_features); + } else { + t->processor_id[0] =3D cpu_to_le32(type4.processor_id); + t->processor_id[1] =3D 0; + } SMBIOS_TABLE_SET_STR(4, processor_version_str, type4.version); t->voltage =3D 0; t->external_clock =3D cpu_to_le16(0); /* Unknown */ @@ -1292,6 +1303,8 @@ void smbios_entry_add(QemuOpts *opts, Error **errp) save_opt(&type4.serial, opts, "serial"); save_opt(&type4.asset, opts, "asset"); save_opt(&type4.part, opts, "part"); + /* If the value is 0, it will take the value from the CPU mode= l. */ + type4.processor_id =3D qemu_opt_get_number(opts, "processor-id= ", 0); type4.max_speed =3D qemu_opt_get_number(opts, "max-speed", DEFAULT_CPU_SPEED); type4.current_speed =3D qemu_opt_get_number(opts, "current-spe= ed", diff --git a/qemu-options.hx b/qemu-options.hx index ec90505d84..3c51b6cf8f 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -2527,6 +2527,7 @@ DEF("smbios", HAS_ARG, QEMU_OPTION_smbios, " specify SMBIOS type 3 fields\n" "-smbios type=3D4[,sock_pfx=3Dstr][,manufacturer=3Dstr][,version=3Dstr= ][,serial=3Dstr]\n" " [,asset=3Dstr][,part=3Dstr][,max-speed=3D%d][,current-s= peed=3D%d]\n" + " [,processor-id=3D%d]\n" " specify SMBIOS type 4 fields\n" "-smbios type=3D11[,value=3Dstr][,path=3Dfilename]\n" " specify SMBIOS type 11 fields\n" --=20 2.34.1.448.ga2b2bfdf31-goog