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Re: [PATCH 1/5] i386: move hyperv_vendor_id initialization to x86_cpu_re
From: |
Vitaly Kuznetsov |
Subject: |
Re: [PATCH 1/5] i386: move hyperv_vendor_id initialization to x86_cpu_realizefn() |
Date: |
Wed, 10 Mar 2021 12:43:47 +0100 |
Claudio Fontana <cfontana@suse.de> writes:
> On 11/19/20 11:32 AM, Vitaly Kuznetsov wrote:
>> As a preparation to expanding Hyper-V CPU features early, move
>> hyperv_vendor_id initialization to x86_cpu_realizefn(). Introduce
>> x86_cpu_hyperv_realize() to not not pollute x86_cpu_realizefn()
>> itself.
>>
>> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
>
>
> Hi Vitaly,
>
> If building for TCG-only, does the x86_cpu_hyperv_realize function and other
> hyperv related functions
> make sense to keep in the build?
>
> Now that we have per-accelerator subdirs in target/i386, should the hyperv
> code be moved over?
>
Hi Claudio,
I'm not exactly sure. On one hand, we only implement Hyper-V emulation
with KVM now. On the other hand Hyper-V specific CPU options are
available even without it (and as Igor feels strongly against
introducing custom option parsers, I don't see how we can forbid to use
them without KVM). x86_cpu_hyperv_realize() is the bare minimum which is
only needed to set our internal Hyper-V related data in a sane way,
e.g. set the default to 'cpu->hyperv_vendor_id'. The actual enablement
code is in target/i386/kvm.c already. Do you see anything besides
x86_cpu_hyperv_realize() which we could move there? Could you please
take a look at v5
(https://mail.gnu.org/archive/html/qemu-devel/2021-03/msg00158.html)?
Thanks!
> Thanks,
>
> Claudio
>
>
>> ---
>> target/i386/cpu.c | 23 ++++++++++++++++++++++-
>> target/i386/cpu.h | 3 ++-
>> target/i386/kvm.c | 25 ++++++++++---------------
>> 3 files changed, 34 insertions(+), 17 deletions(-)
>>
>> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
>> index 5a8c96072e41..2a6885753378 100644
>> --- a/target/i386/cpu.c
>> +++ b/target/i386/cpu.c
>> @@ -6509,6 +6509,25 @@ static void x86_cpu_filter_features(X86CPU *cpu, bool
>> verbose)
>> }
>> }
>>
>> +static void x86_cpu_hyperv_realize(X86CPU *cpu)
>> +{
>> + size_t len;
>> +
>> + /* Hyper-V vendor id */
>> + if (!cpu->hyperv_vendor) {
>> + memcpy(cpu->hyperv_vendor_id, "Microsoft Hv", 12);
>> + } else {
>> + len = strlen(cpu->hyperv_vendor);
>> +
>> + if (len > 12) {
>> + warn_report("hv-vendor-id truncated to 12 characters");
>> + len = 12;
>> + }
>> + memset(cpu->hyperv_vendor_id, 0, 12);
>> + memcpy(cpu->hyperv_vendor_id, cpu->hyperv_vendor, len);
>> + }
>> +}
>> +
>> static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
>> {
>> CPUState *cs = CPU(dev);
>> @@ -6680,6 +6699,8 @@ static void x86_cpu_realizefn(DeviceState *dev, Error
>> **errp)
>> env->cache_info_amd.l3_cache = &legacy_l3_cache;
>> }
>>
>> + /* Process Hyper-V enlightenments */
>> + x86_cpu_hyperv_realize(cpu);
>>
>> cpu_exec_realizefn(cs, &local_err);
>> if (local_err != NULL) {
>> @@ -7198,7 +7219,7 @@ static Property x86_cpu_properties[] = {
>> DEFINE_PROP_UINT32("min-xlevel2", X86CPU, env.cpuid_min_xlevel2, 0),
>> DEFINE_PROP_UINT64("ucode-rev", X86CPU, ucode_rev, 0),
>> DEFINE_PROP_BOOL("full-cpuid-auto-level", X86CPU,
>> full_cpuid_auto_level, true),
>> - DEFINE_PROP_STRING("hv-vendor-id", X86CPU, hyperv_vendor_id),
>> + DEFINE_PROP_STRING("hv-vendor-id", X86CPU, hyperv_vendor),
>> DEFINE_PROP_BOOL("cpuid-0xb", X86CPU, enable_cpuid_0xb, true),
>> DEFINE_PROP_BOOL("lmce", X86CPU, enable_lmce, false),
>> DEFINE_PROP_BOOL("l3-cache", X86CPU, enable_l3_cache, true),
>> diff --git a/target/i386/cpu.h b/target/i386/cpu.h
>> index 88e8586f8fb4..be640bf45c29 100644
>> --- a/target/i386/cpu.h
>> +++ b/target/i386/cpu.h
>> @@ -1655,11 +1655,12 @@ struct X86CPU {
>> uint64_t ucode_rev;
>>
>> uint32_t hyperv_spinlock_attempts;
>> - char *hyperv_vendor_id;
>> + char *hyperv_vendor;
>> bool hyperv_synic_kvm_only;
>> uint64_t hyperv_features;
>> bool hyperv_passthrough;
>> OnOffAuto hyperv_no_nonarch_cs;
>> + uint32_t hyperv_vendor_id[3];
>>
>> bool check_cpuid;
>> bool enforce_cpuid;
>> diff --git a/target/i386/kvm.c b/target/i386/kvm.c
>> index a2934dda027c..788a2cf2ec51 100644
>> --- a/target/i386/kvm.c
>> +++ b/target/i386/kvm.c
>> @@ -1205,6 +1205,13 @@ static int hyperv_handle_properties(CPUState *cs,
>> memcpy(cpuid_ent, &cpuid->entries[0],
>> cpuid->nent * sizeof(cpuid->entries[0]));
>>
>> + c = cpuid_find_entry(cpuid, HV_CPUID_VENDOR_AND_MAX_FUNCTIONS, 0);
>> + if (c) {
>> + cpu->hyperv_vendor_id[0] = c->ebx;
>> + cpu->hyperv_vendor_id[1] = c->ecx;
>> + cpu->hyperv_vendor_id[2] = c->edx;
>> + }
>> +
>> c = cpuid_find_entry(cpuid, HV_CPUID_FEATURES, 0);
>> if (c) {
>> env->features[FEAT_HYPERV_EAX] = c->eax;
>> @@ -1279,23 +1286,11 @@ static int hyperv_handle_properties(CPUState *cs,
>>
>> c = &cpuid_ent[cpuid_i++];
>> c->function = HV_CPUID_VENDOR_AND_MAX_FUNCTIONS;
>> - if (!cpu->hyperv_vendor_id) {
>> - memcpy(signature, "Microsoft Hv", 12);
>> - } else {
>> - size_t len = strlen(cpu->hyperv_vendor_id);
>> -
>> - if (len > 12) {
>> - error_report("hv-vendor-id truncated to 12 characters");
>> - len = 12;
>> - }
>> - memset(signature, 0, 12);
>> - memcpy(signature, cpu->hyperv_vendor_id, len);
>> - }
>> c->eax = hyperv_feat_enabled(cpu, HYPERV_FEAT_EVMCS) ?
>> HV_CPUID_NESTED_FEATURES : HV_CPUID_IMPLEMENT_LIMITS;
>> - c->ebx = signature[0];
>> - c->ecx = signature[1];
>> - c->edx = signature[2];
>> + c->ebx = cpu->hyperv_vendor_id[0];
>> + c->ecx = cpu->hyperv_vendor_id[1];
>> + c->edx = cpu->hyperv_vendor_id[2];
>>
>> c = &cpuid_ent[cpuid_i++];
>> c->function = HV_CPUID_INTERFACE;
>>
>
--
Vitaly