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Re: [PATCH RFC 03/22] i386: move hyperv_vendor_id initialization to x86_
From: |
Eduardo Habkost |
Subject: |
Re: [PATCH RFC 03/22] i386: move hyperv_vendor_id initialization to x86_cpu_realizefn() |
Date: |
Fri, 18 Sep 2020 18:14:54 -0400 |
On Fri, Sep 04, 2020 at 04:54:12PM +0200, Vitaly Kuznetsov wrote:
> As a preparation to expanding Hyper-V CPU features early, move
> hyperv_vendor_id initialization to x86_cpu_realizefn().
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---
> target/i386/cpu.c | 15 ++++++++++++++-
> target/i386/cpu.h | 3 ++-
> target/i386/kvm.c | 25 ++++++++++---------------
> 3 files changed, 26 insertions(+), 17 deletions(-)
>
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index 14489def2177..07e9da9e567e 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -6625,6 +6625,19 @@ static void x86_cpu_realizefn(DeviceState *dev, Error
> **errp)
> }
> }
>
> + if (!cpu->hyperv_vendor) {
> + memcpy(cpu->hyperv_vendor_id, "Microsoft Hv", 12);
> + } else {
> + size_t 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);
> + }
> +
The change makes sense, but considering that we'll have a lot of
new code added to x86_cpu_realizefn(), I would prefer to create a
separate x86_cpu_hyperv_realize() function to make
x86_cpu_realizefn() a bit more readable.
> if (cpu->ucode_rev == 0) {
> /* The default is the same as KVM's. */
> if (IS_AMD_CPU(env)) {
> @@ -7313,7 +7326,7 @@ 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 d3097be6a50a..903994818093 100644
> --- a/target/i386/cpu.h
> +++ b/target/i386/cpu.h
> @@ -1654,11 +1654,12 @@ 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 205b68bc0ce8..47779c5e1efd 100644
> --- a/target/i386/kvm.c
> +++ b/target/i386/kvm.c
> @@ -1225,6 +1225,13 @@ 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;
> + }
> +
I can't find the equivalent of this code in the current tree? Is
hyperv vendor ID broken when using hv-passthrough today?
Maybe this could be done as a separate patch, as it changes
behavior of hv-passthrough?
> c = cpuid_find_entry(cpuid, HV_CPUID_FEATURES, 0);
> if (c) {
> env->features[FEAT_HYPERV_EAX] = c->eax;
> @@ -1299,23 +1306,11 @@ 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;
> --
> 2.25.4
>
--
Eduardo
- [PATCH RFC 00/22] i386: KVM: expand Hyper-V features early, Vitaly Kuznetsov, 2020/09/04
- [PATCH RFC 14/22] i386: move eVMCS enablement to hyperv_init_vcpu(), Vitaly Kuznetsov, 2020/09/04
- [PATCH RFC 01/22] WIP: update linux/headers, Vitaly Kuznetsov, 2020/09/04
- [PATCH RFC 03/22] i386: move hyperv_vendor_id initialization to x86_cpu_realizefn(), Vitaly Kuznetsov, 2020/09/04
- Re: [PATCH RFC 03/22] i386: move hyperv_vendor_id initialization to x86_cpu_realizefn(),
Eduardo Habkost <=
- [PATCH RFC 04/22] i386: move hyperv_interface_id initialization to x86_cpu_realizefn(), Vitaly Kuznetsov, 2020/09/04
- [PATCH RFC 06/22] i386: move hyperv_limits initialization to x86_cpu_realizefn(), Vitaly Kuznetsov, 2020/09/04
- [PATCH RFC 07/22] i386: fill in FEAT_HYPERV_EDX from edx instead of eax, Vitaly Kuznetsov, 2020/09/04
- [PATCH RFC 11/22] i386: add reserved FEAT_HV_NESTED_EBX/ECX/EDX CPUID leaves, Vitaly Kuznetsov, 2020/09/04
- [PATCH RFC 08/22] i386: invert hyperv_spinlock_attempts setting logic with hv_passthrough, Vitaly Kuznetsov, 2020/09/04
- [PATCH RFC 02/22] i386: drop x86_cpu_get_supported_feature_word() forward declaration, Vitaly Kuznetsov, 2020/09/04