From: Xiaoyao Li <xiaoyao.li@intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Jim Mattson <jmattson@google.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Joerg Roedel <joro@8bytes.org>
Subject: Re: [PATCH v3 4/8] KVM: X86: Split kvm_update_cpuid()
Date: Wed, 8 Jul 2020 20:33:02 +0800 [thread overview]
Message-ID: <92184f05-ca27-268c-ea72-f939fb1a0ab2@intel.com> (raw)
In-Reply-To: <ad349b28-bc62-e478-c610-e829974a8342@redhat.com>
On 7/8/2020 8:06 PM, Paolo Bonzini wrote:
> On 08/07/20 08:50, Xiaoyao Li wrote:
>> Split the part of updating vcpu model out of kvm_update_cpuid(), and put
>> it into a new kvm_update_vcpu_model(). So it's more clear that
>> kvm_update_cpuid() is to update guest CPUID settings, while
>> kvm_update_vcpu_model() is to update vcpu model (settings) based on the
>> updated CPUID settings.
>>
>> Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
>
> I would prefer to keep the kvm_update_cpuid name for what you called
> kvm_update_vcpu_model(), and rename the rest to kvm_update_cpuid_runtime().
But there is no CPUID being updated in kvm_update_cpuid(), after
kvm_update_cpuid_runtime() is split out. This is confusing, IMO.
> Paolo
>
>> ---
>> arch/x86/kvm/cpuid.c | 38 ++++++++++++++++++++++++--------------
>> arch/x86/kvm/cpuid.h | 1 +
>> arch/x86/kvm/x86.c | 1 +
>> 3 files changed, 26 insertions(+), 14 deletions(-)
>>
>> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
>> index a825878b7f84..001f5a94880e 100644
>> --- a/arch/x86/kvm/cpuid.c
>> +++ b/arch/x86/kvm/cpuid.c
>> @@ -76,7 +76,6 @@ static int kvm_check_cpuid(struct kvm_vcpu *vcpu)
>> void kvm_update_cpuid(struct kvm_vcpu *vcpu)
>> {
>> struct kvm_cpuid_entry2 *best;
>> - struct kvm_lapic *apic = vcpu->arch.apic;
>>
>> best = kvm_find_cpuid_entry(vcpu, 1, 0);
>> if (best) {
>> @@ -89,26 +88,14 @@ void kvm_update_cpuid(struct kvm_vcpu *vcpu)
>> vcpu->arch.apic_base & MSR_IA32_APICBASE_ENABLE);
>> }
>>
>> - if (best && apic) {
>> - if (cpuid_entry_has(best, X86_FEATURE_TSC_DEADLINE_TIMER))
>> - apic->lapic_timer.timer_mode_mask = 3 << 17;
>> - else
>> - apic->lapic_timer.timer_mode_mask = 1 << 17;
>> - }
>> -
>> best = kvm_find_cpuid_entry(vcpu, 7, 0);
>> if (best && boot_cpu_has(X86_FEATURE_PKU) && best->function == 0x7)
>> cpuid_entry_change(best, X86_FEATURE_OSPKE,
>> kvm_read_cr4_bits(vcpu, X86_CR4_PKE));
>>
>> best = kvm_find_cpuid_entry(vcpu, 0xD, 0);
>> - if (!best) {
>> - vcpu->arch.guest_supported_xcr0 = 0;
>> - } else {
>> - vcpu->arch.guest_supported_xcr0 =
>> - (best->eax | ((u64)best->edx << 32)) & supported_xcr0;
>> + if (best)
>> best->ebx = xstate_required_size(vcpu->arch.xcr0, false);
>> - }
>>
>> best = kvm_find_cpuid_entry(vcpu, 0xD, 1);
>> if (best && (cpuid_entry_has(best, X86_FEATURE_XSAVES) ||
>> @@ -127,6 +114,27 @@ void kvm_update_cpuid(struct kvm_vcpu *vcpu)
>> vcpu->arch.ia32_misc_enable_msr &
>> MSR_IA32_MISC_ENABLE_MWAIT);
>> }
>> +}
>> +
>> +void kvm_update_vcpu_model(struct kvm_vcpu *vcpu)
>> +{
>> + struct kvm_lapic *apic = vcpu->arch.apic;
>> + struct kvm_cpuid_entry2 *best;
>> +
>> + best = kvm_find_cpuid_entry(vcpu, 1, 0);
>> + if (best && apic) {
>> + if (cpuid_entry_has(best, X86_FEATURE_TSC_DEADLINE_TIMER))
>> + apic->lapic_timer.timer_mode_mask = 3 << 17;
>> + else
>> + apic->lapic_timer.timer_mode_mask = 1 << 17;
>> + }
>> +
>> + best = kvm_find_cpuid_entry(vcpu, 0xD, 0);
>> + if (!best)
>> + vcpu->arch.guest_supported_xcr0 = 0;
>> + else
>> + vcpu->arch.guest_supported_xcr0 =
>> + (best->eax | ((u64)best->edx << 32)) & supported_xcr0;
>>
>> /* Note, maxphyaddr must be updated before tdp_level. */
>> vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
>> @@ -218,6 +226,7 @@ int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
>> kvm_apic_set_version(vcpu);
>> kvm_x86_ops.cpuid_update(vcpu);
>> kvm_update_cpuid(vcpu);
>> + kvm_update_vcpu_model(vcpu);
>>
>> kvfree(cpuid_entries);
>> out:
>> @@ -247,6 +256,7 @@ int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
>> kvm_apic_set_version(vcpu);
>> kvm_x86_ops.cpuid_update(vcpu);
>> kvm_update_cpuid(vcpu);
>> + kvm_update_vcpu_model(vcpu);
>> out:
>> return r;
>> }
>> diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
>> index f136de1debad..45e3643e2fba 100644
>> --- a/arch/x86/kvm/cpuid.h
>> +++ b/arch/x86/kvm/cpuid.h
>> @@ -10,6 +10,7 @@ extern u32 kvm_cpu_caps[NCAPINTS] __read_mostly;
>> void kvm_set_cpu_caps(void);
>>
>> void kvm_update_cpuid(struct kvm_vcpu *vcpu);
>> +void kvm_update_vcpu_model(struct kvm_vcpu *vcpu);
>> struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
>> u32 function, u32 index);
>> int kvm_dev_ioctl_get_cpuid(struct kvm_cpuid2 *cpuid,
>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>> index 09ee54f5e385..6f376392e6e6 100644
>> --- a/arch/x86/kvm/x86.c
>> +++ b/arch/x86/kvm/x86.c
>> @@ -8184,6 +8184,7 @@ static void enter_smm(struct kvm_vcpu *vcpu)
>> #endif
>>
>> kvm_update_cpuid(vcpu);
>> + kvm_update_vcpu_model(vcpu);
>> kvm_mmu_reset_context(vcpu);
>> }
>>
>>
>
next prev parent reply other threads:[~2020-07-08 12:33 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-08 6:50 [PATCH v3 0/8] Refactor handling flow of KVM_SET_CPUID* Xiaoyao Li
2020-07-08 6:50 ` [PATCH v3 1/8] KVM: X86: Reset vcpu->arch.cpuid_nent to 0 if SET_CPUID* fails Xiaoyao Li
2020-07-08 12:00 ` Paolo Bonzini
2020-07-08 6:50 ` [PATCH v3 2/8] KVM: X86: Go on updating other CPUID leaves when leaf 1 is absent Xiaoyao Li
2020-07-08 6:50 ` [PATCH v3 3/8] KVM: X86: Introduce kvm_check_cpuid() Xiaoyao Li
2020-07-08 12:28 ` Xiaoyao Li
2020-07-08 12:43 ` Paolo Bonzini
2020-07-08 6:50 ` [PATCH v3 4/8] KVM: X86: Split kvm_update_cpuid() Xiaoyao Li
2020-07-08 12:06 ` Paolo Bonzini
2020-07-08 12:33 ` Xiaoyao Li [this message]
2020-07-08 12:41 ` Paolo Bonzini
2020-07-08 13:27 ` Xiaoyao Li
2020-07-08 13:30 ` Paolo Bonzini
2020-07-08 6:50 ` [PATCH v3 5/8] KVM: X86: Rename cpuid_update() to update_vcpu_model() Xiaoyao Li
2020-07-08 12:08 ` Paolo Bonzini
2020-07-08 6:50 ` [PATCH v3 6/8] KVM: X86: Move kvm_x86_ops.update_vcpu_model() into kvm_update_vcpu_model() Xiaoyao Li
2020-07-08 6:50 ` [PATCH v3 7/8] KVM: lapic: Use guest_cpuid_has() in kvm_apic_set_version() Xiaoyao Li
2020-07-08 6:50 ` [PATCH v3 8/8] KVM: X86: Move kvm_apic_set_version() to kvm_update_vcpu_model() Xiaoyao Li
2020-07-08 12:10 ` [PATCH v3 0/8] Refactor handling flow of KVM_SET_CPUID* Paolo Bonzini
2020-07-09 4:27 ` Xiaoyao Li
2020-07-09 9:37 ` Paolo Bonzini
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