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Set the MCDT_NO bit for CPUs known to not exhibit the behavior, so guests can get this information, as using family/model/stepping detection when running virtualized is not to be relied. Signed-off-by: Roger Pau Monn=C3=A9 --- xen/arch/x86/cpu/intel.c | 70 ++++++++++++++++++++++++++++++++++++++++ xen/arch/x86/cpuid.c | 10 ++++++ 2 files changed, 80 insertions(+) diff --git a/xen/arch/x86/cpu/intel.c b/xen/arch/x86/cpu/intel.c index dc6a0c7807..d821f460ae 100644 --- a/xen/arch/x86/cpu/intel.c +++ b/xen/arch/x86/cpu/intel.c @@ -518,6 +518,73 @@ static void intel_log_freq(const struct cpuinfo_x86 *c) printk("%u MHz\n", (factor * max_ratio + 50) / 100); } =20 +void update_mcdt_no(struct cpuinfo_x86 *c) +{ +#define FAM6_MODEL(m, s, c) { 6, m, s, c } + /* + * List of models that do not exhibit MCDT behavior, but might not + * advertise MCDT_NO on CPUID. + */ + static const struct { + uint8_t family; + uint8_t model; + uint8_t stepping; + bool check_stepping; + } mcdt_no[] =3D { + /* Haswell Server EP, EP4S. */ + FAM6_MODEL(0x3f, 2, true), + /* Elkhart Lake. */ + FAM6_MODEL(0x3f, 4, true), + /* Cherryview. */ + FAM6_MODEL(0x4c, 0, false), + /* Broadwell Server E, EP, EP4S, EX. */ + FAM6_MODEL(0x4f, 0, false), + /* Broadwell DE V2, V3. */ + FAM6_MODEL(0x56, 3, true), + /* Broadwell DE Y0. */ + FAM6_MODEL(0x56, 4, true), + /* Broadwell DE A1, Hewitt Lake. */ + FAM6_MODEL(0x56, 5, true), + /* Anniedale. */ + FAM6_MODEL(0x5a, 0, false), + /* Apollo Lake. */ + FAM6_MODEL(0x5c, 9, true), + FAM6_MODEL(0x5c, 0xa, true), + /* Denverton. */ + FAM6_MODEL(0x5f, 1, true), + /* XMM7272. */ + FAM6_MODEL(0x65, 0, false), + /* Cougar Mountain. */ + FAM6_MODEL(0x6e, 0, false), + /* Butter. */ + FAM6_MODEL(0x75, 0, false), + /* Gemini Lake. */ + FAM6_MODEL(0x7a, 1, true), + FAM6_MODEL(0x7a, 8, true), + /* Snowridge. */ + FAM6_MODEL(0x86, 4, true), + FAM6_MODEL(0x86, 5, true), + FAM6_MODEL(0x86, 7, true), + /* Lakefield B-step. */ + FAM6_MODEL(0x8a, 1, true), + /* Elkhart Lake. */ + FAM6_MODEL(0x96, 1, true), + /* Jasper Lake. */ + FAM6_MODEL(0x9c, 0, true), + { } + }; +#undef FAM6_MODEL + const typeof(mcdt_no[0]) *m; + + for (m =3D mcdt_no; m->family | m->model | m->stepping; m++) + if ( c->x86 =3D=3D m->family && c->x86_model =3D=3D m->model && + (!m->check_stepping || c->x86_mask =3D=3D m->stepping) ) + { + __set_bit(X86_FEATURE_MCDT_NO, c->x86_capability); + break; + } +} + static void cf_check init_intel(struct cpuinfo_x86 *c) { /* Detect the extended topology information if available */ @@ -556,6 +623,9 @@ static void cf_check init_intel(struct cpuinfo_x86 *c) if ((opt_cpu_info && !(c->apicid & (c->x86_num_siblings - 1))) || c =3D=3D &boot_cpu_data ) intel_log_freq(c); + + if (!cpu_has(c, X86_FEATURE_MCDT_NO)) + update_mcdt_no(c); } =20 const struct cpu_dev intel_cpu_dev =3D { diff --git a/xen/arch/x86/cpuid.c b/xen/arch/x86/cpuid.c index 66be1a8015..ca2ed44149 100644 --- a/xen/arch/x86/cpuid.c +++ b/xen/arch/x86/cpuid.c @@ -360,6 +360,16 @@ static void __init calculate_host_policy(void) =20 p->basic.max_leaf =3D min_t(uint32_t, p->basic.max_leaf, ARRAY_SIZE(p->basic.raw) - 1); + + /* + * For Intel hardware MCDT_NO might be set by Xen for models that don't + * exhibit MCDT behavior but also don't have the MCDT_NO bit set in + * CPUID. Extend feat.max_subleaf beyond what hardware supports to in= clude + * the feature leaf containing this information. + */ + if ( boot_cpu_has(X86_FEATURE_MCDT_NO) ) + p->feat.max_subleaf =3D max(p->feat.max_subleaf, 2u); + p->feat.max_subleaf =3D min_t(uint32_t, p->feat.max_subleaf, ARRAY_SIZE(p->feat.raw) - 1); =20 --=20 2.36.0