[pve-devel] [PATCH v5 qemu-server 1/1] cpuconfig: add new x86-64-vX models

[Alexandre Derumier <aderumier@odiso.com>]

https://gitlab.com/x86-psABIs/x86-64-ABI/
https://lists.gnu.org/archive/html/qemu-devel/2021-06/msg01592.html
"
In 2020, AMD, Intel, Red Hat, and SUSE worked together to define
three microarchitecture levels on top of the historical x86-64
baseline:

  * x86-64:    original x86_64 baseline instruction set
  * x86-64-v2: vector instructions up to Streaming SIMD
               Extensions 4.2 (SSE4.2)  and Supplemental
               Streaming SIMD Extensions 3 (SSSE3), the
               POPCNT instruction, and CMPXCHG16B
  * x86-64-v3: vector instructions up to AVX2, MOVBE,
               and additional bit-manipulation instructions.
  * x86-64-v4: vector instructions from some of the
               AVX-512 variants.
"

This patch add new builtin model derivated from qemu64 model,
to be compatible between intel/amd.

mandatory flags from qemu-doc generator:
https://github.com/qemu/qemu/commit/4e2f5f3a9db06e87a73eb60a7cc9754fc13596ee

levels = [
    [ # x86-64 baseline
        "cmov",
        "cx8",
        "fpu",
        "fxsr",
        "mmx",
        "syscall",
        "sse",
        "sse2",
    ],
    [ # x86-64-v2
        "cx16",
        "lahf-lm",
        "popcnt",
        "pni",
        "sse4.1",
        "sse4.2",
        "ssse3",
    ],
    [ # x86-64-v3
        "avx",
        "avx2",
        "bmi1",
        "bmi2",
        "f16c",
        "fma",
        "abm",
        "movbe",
    ],
    [ # x86-64-v4
        "avx512f",
        "avx512bw",
        "avx512cd",
        "avx512dq",
        "avx512vl",
    ],
]

x86-64-v1 : I'm skipping it, as it's basicaly qemu64|kvm64 -vme,-cx16 for compat Opteron_G1 from 2004
            so will use it as qemu64|kvm64 is higher are not working on opteron_g1 anyway

x86-64-v2 : Derived from qemu, +popcnt;+pni;+sse4.1;+sse4.2;+ssse3

min intel: Nehalem
min amd : Opteron_G3

x86-64-v2-AES : Derived from qemu, +aes;+popcnt;+pni;+sse4.1;+sse4.2;+ssse3

min intel: Westmere
min amd : Opteron_G3

x86-64-v3 : Derived from qemu64 +aes;+popcnt;+pni;+sse4.1;+sse4.2;+ssse3;+avx;+avx2;+bmi1;+bmi2;+f16c;+fma;+abm;+movbe

min intel: Haswell
min amd : EPYC_v1

x86-64-v4 : Derived from qemu64 +aes;+popcnt;+pni;+sse4.1;+sse4.2;+ssse3;+avx;+avx2;+bmi1;+bmi2;+f16c;+fma;+abm;+movbe;+avx512f;+avx512bw;+avx512cd;+avx512dq;+avx512vl

min intel: Skylake
min amd : EPYC_v4

Signed-off-by: Alexandre Derumier <aderumier@odiso.com>
---
 PVE/QemuServer/CPUConfig.pm | 48 +++++++++++++++++++++++++++++++++----
 1 file changed, 43 insertions(+), 5 deletions(-)

diff --git a/PVE/QemuServer/CPUConfig.pm b/PVE/QemuServer/CPUConfig.pm
index fb0861b..142d489 100644
--- a/PVE/QemuServer/CPUConfig.pm
+++ b/PVE/QemuServer/CPUConfig.pm
@@ -31,6 +31,26 @@ sub load_custom_model_conf {
     return cfs_read_file($default_filename);
 }
 
+#builtin models : reported-model is mandatory
+my $builtin_models = {
+    'x86-64-v2' => {
+	'reported-model' => 'qemu64',
+	flags => "+popcnt;+pni;+sse4.1;+sse4.2;+ssse3",
+    },
+    'x86-64-v2-AES' => {
+	'reported-model' => 'qemu64',
+	flags => "+aes;+popcnt;+pni;+sse4.1;+sse4.2;+ssse3",
+    },
+    'x86-64-v3' => {
+	'reported-model' => 'qemu64',
+	flags => "+aes;+popcnt;+pni;+sse4.1;+sse4.2;+ssse3;+avx;+avx2;+bmi1;+bmi2;+f16c;+fma;+abm;+movbe",
+    },
+    'x86-64-v4' => {
+	'reported-model' => 'qemu64',
+	flags => "+aes;+popcnt;+pni;+sse4.1;+sse4.2;+ssse3;+avx;+avx2;+bmi1;+bmi2;+f16c;+fma;+abm;+movbe;+avx512f;+avx512bw;+avx512cd;+avx512dq;+avx512vl",
+    },
+};
+
 my $depreacated_cpu_map = {
     # there never was such a client CPU, so map it to the server one for backward compat
     'Icelake-Client' => 'Icelake-Server',
@@ -212,7 +232,7 @@ sub validate_vm_cpu_conf {
 	get_custom_model($cputype);
     } else {
 	die "Built-in cputype '$cputype' is not defined (missing 'custom-' prefix?)\n"
-	    if !defined($cpu_vendor_list->{$cputype});
+	    if !defined($cpu_vendor_list->{$cputype}) && !defined($builtin_models->{$cputype});
     }
 
     # in a VM-specific config, certain properties are limited/forbidden
@@ -302,6 +322,16 @@ sub get_cpu_models {
 	};
     }
 
+    for my $model (keys %{$builtin_models}) {
+	my $reported_model = $builtin_models->{$model}->{'reported-model'};
+	my $vendor = $cpu_vendor_list->{$reported_model};
+	push @$models, {
+	    name => $model,
+	    custom => 0,
+	    vendor => $vendor,
+	};
+    }
+
     return $models if !$include_custom;
 
     my $conf = load_custom_model_conf();
@@ -359,7 +389,9 @@ sub print_cpu_device {
 	    or die "Cannot parse cpu description: $cputype\n";
 	$cpu = $cpuconf->{cputype};
 
-	if (is_custom_model($cpu)) {
+	if (my $model = $builtin_models->{$cpu}) {
+	    $cpu = $model->{'reported-model'};
+	} elsif (is_custom_model($cputype)) {
 	    my $custom_cpu = get_custom_model($cpu);
 
 	    $cpu = $custom_cpu->{'reported-model'} // $cpu_fmt->{'reported-model'}->{default};
@@ -468,14 +500,17 @@ sub get_cpu_options {
 
     my $cpu = {};
     my $custom_cpu;
+    my $builtin_cpu;
     my $hv_vendor_id;
     if (my $cpu_prop_str = $conf->{cpu}) {
 	$cpu = PVE::JSONSchema::parse_property_string('pve-vm-cpu-conf', $cpu_prop_str)
 	    or die "Cannot parse cpu description: $cpu_prop_str\n";
 
 	$cputype = $cpu->{cputype};
-
-	if (is_custom_model($cputype)) {
+	if (my $model = $builtin_models->{$cputype}) {
+	    $cputype = $model->{'reported-model'};
+	    $builtin_cpu->{flags} = $model->{'flags'};
+	} elsif (is_custom_model($cputype)) {
 	    $custom_cpu = get_custom_model($cputype);
 
 	    $cputype = $custom_cpu->{'reported-model'} // $cpu_fmt->{'reported-model'}->{default};
@@ -504,6 +539,9 @@ sub get_cpu_options {
 	)
 	: undef;
 
+    my $builtin_cputype_flags = parse_cpuflag_list(
+	$cpu_flag_any_re, "set by builtin CPU model", $builtin_cpu->{flags});
+
     my $custom_cputype_flags = parse_cpuflag_list(
 	$cpu_flag_any_re, "set by custom CPU model", $custom_cpu->{flags});
 
@@ -534,7 +572,7 @@ sub get_cpu_options {
 
     # will be resolved in parameter order
     $cpu_str .= resolve_cpu_flags(
-	$pve_flags, $hv_flags, $custom_cputype_flags, $vm_flags, $pve_forced_flags);
+	$pve_flags, $hv_flags, $builtin_cputype_flags, $custom_cputype_flags, $vm_flags, $pve_forced_flags);
 
     my $phys_bits = '';
     foreach my $conf ($custom_cpu, $cpu) {
-- 
2.30.2