From: Reiji Watanabe <reijiw@google.com>
To: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Xiaoyao Li <xiaoyao.li@intel.com>
Subject: Re: [PATCH 09/15] KVM: VMX: Use flag to indicate "active" uret MSRs instead of sorting list
Date: Fri, 7 May 2021 20:31:53 -0700 [thread overview]
Message-ID: <CAAeT=FyKjHykGNcQc=toqvhCR281SWc6UqNihsjyU+vuo3z5Yg@mail.gmail.com> (raw)
In-Reply-To: <20210504171734.1434054-10-seanjc@google.com>
> -static void vmx_setup_uret_msr(struct vcpu_vmx *vmx, unsigned int msr)
> +static void vmx_setup_uret_msr(struct vcpu_vmx *vmx, unsigned int msr,
> + bool load_into_hardware)
> {
> - struct vmx_uret_msr tmp;
> - int from, to;
> + struct vmx_uret_msr *uret_msr;
>
> - from = __vmx_find_uret_msr(vmx, msr);
> - if (from < 0)
> + uret_msr = vmx_find_uret_msr(vmx, msr);
> + if (!uret_msr)
> return;
> - to = vmx->nr_active_uret_msrs++;
>
> - tmp = vmx->guest_uret_msrs[to];
> - vmx->guest_uret_msrs[to] = vmx->guest_uret_msrs[from];
> - vmx->guest_uret_msrs[from] = tmp;
> + uret_msr->load_into_hardware = load_into_hardware;
> }
>
> /*
> @@ -1785,30 +1781,36 @@ static void vmx_setup_uret_msr(struct vcpu_vmx *vmx, unsigned int msr)
> */
> static void setup_msrs(struct vcpu_vmx *vmx)
> {
> - vmx->guest_uret_msrs_loaded = false;
> - vmx->nr_active_uret_msrs = 0;
> #ifdef CONFIG_X86_64
> + bool load_syscall_msrs;
> +
> /*
> * The SYSCALL MSRs are only needed on long mode guests, and only
> * when EFER.SCE is set.
> */
> - if (is_long_mode(&vmx->vcpu) && (vmx->vcpu.arch.efer & EFER_SCE)) {
> - vmx_setup_uret_msr(vmx, MSR_STAR);
> - vmx_setup_uret_msr(vmx, MSR_LSTAR);
> - vmx_setup_uret_msr(vmx, MSR_SYSCALL_MASK);
> - }
> + load_syscall_msrs = is_long_mode(&vmx->vcpu) &&
> + (vmx->vcpu.arch.efer & EFER_SCE);
> +
> + vmx_setup_uret_msr(vmx, MSR_STAR, load_syscall_msrs);
> + vmx_setup_uret_msr(vmx, MSR_LSTAR, load_syscall_msrs);
> + vmx_setup_uret_msr(vmx, MSR_SYSCALL_MASK, load_syscall_msrs);
> #endif
> - if (update_transition_efer(vmx))
> - vmx_setup_uret_msr(vmx, MSR_EFER);
> + vmx_setup_uret_msr(vmx, MSR_EFER, update_transition_efer(vmx));
>
> - if (guest_cpuid_has(&vmx->vcpu, X86_FEATURE_RDTSCP) ||
> - guest_cpuid_has(&vmx->vcpu, X86_FEATURE_RDPID))
> - vmx_setup_uret_msr(vmx, MSR_TSC_AUX);
> + vmx_setup_uret_msr(vmx, MSR_TSC_AUX,
> + guest_cpuid_has(&vmx->vcpu, X86_FEATURE_RDTSCP) ||
> + guest_cpuid_has(&vmx->vcpu, X86_FEATURE_RDPID));
Shouldn't vmx_setup_uret_msr(,MSR_TSC_AUX,) be called to update
the new flag load_into_hardware for MSR_TSC_AUX when CPUID
(X86_FEATURE_RDTSCP/X86_FEATURE_RDPID) of the vCPU is updated ?
Thanks,
Reiji
next prev parent reply other threads:[~2021-05-08 3:32 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-04 17:17 [PATCH 00/15] KVM: x86: RDPID/RDTSCP fixes and uret MSR cleanups Sean Christopherson
2021-05-04 17:17 ` [PATCH 01/15] KVM: VMX: Do not adverise RDPID if ENABLE_RDTSCP control is unsupported Sean Christopherson
2021-05-04 17:37 ` Jim Mattson
2021-05-04 17:53 ` Jim Mattson
2021-05-04 18:14 ` Sean Christopherson
2021-05-05 3:04 ` Reiji Watanabe
2021-05-10 8:03 ` Maxim Levitsky
2021-05-04 17:17 ` [PATCH 02/15] KVM: x86: Emulate RDPID only if RDTSCP is supported Sean Christopherson
2021-05-04 17:50 ` Jim Mattson
2021-05-05 3:51 ` Reiji Watanabe
2021-05-05 8:01 ` Paolo Bonzini
2021-05-10 8:08 ` Maxim Levitsky
2021-05-10 17:20 ` Sean Christopherson
2021-05-11 12:32 ` Maxim Levitsky
2021-05-04 17:17 ` [PATCH 03/15] KVM: SVM: Inject #UD on RDTSCP when it should be disabled in the guest Sean Christopherson
2021-05-04 21:45 ` Jim Mattson
2021-05-04 21:53 ` Sean Christopherson
2021-05-04 21:56 ` Jim Mattson
2021-05-04 22:10 ` Sean Christopherson
2021-05-04 22:24 ` Jim Mattson
2021-05-04 21:57 ` Paolo Bonzini
2021-05-04 21:58 ` Jim Mattson
2021-05-10 8:08 ` Maxim Levitsky
2021-05-10 16:56 ` Sean Christopherson
2021-05-11 12:34 ` Maxim Levitsky
2021-05-18 10:59 ` Paolo Bonzini
2021-05-18 19:24 ` Sean Christopherson
2021-05-05 4:26 ` Reiji Watanabe
2021-05-10 8:08 ` Maxim Levitsky
2021-05-04 17:17 ` [PATCH 04/15] KVM: x86: Move RDPID emulation intercept to its own enum Sean Christopherson
2021-05-04 23:24 ` Jim Mattson
2021-05-10 8:14 ` Maxim Levitsky
2021-05-04 17:17 ` [PATCH 05/15] KVM: VMX: Disable preemption when probing user return MSRs Sean Christopherson
2021-05-04 23:36 ` Jim Mattson
2021-05-10 8:18 ` Maxim Levitsky
2021-05-04 17:17 ` [PATCH 06/15] KVM: SVM: Probe and load MSR_TSC_AUX regardless of RDTSCP support in host Sean Christopherson
2021-05-10 8:20 ` Maxim Levitsky
2021-05-04 17:17 ` [PATCH 07/15] KVM: x86: Add support for RDPID without RDTSCP Sean Christopherson
2021-05-10 8:20 ` Maxim Levitsky
2021-05-04 17:17 ` [PATCH 08/15] KVM: VMX: Configure list of user return MSRs at module init Sean Christopherson
2021-05-10 8:23 ` Maxim Levitsky
2021-05-10 15:13 ` Sean Christopherson
2021-05-11 12:34 ` Maxim Levitsky
2021-05-11 20:10 ` Sean Christopherson
2021-05-04 17:17 ` [PATCH 09/15] KVM: VMX: Use flag to indicate "active" uret MSRs instead of sorting list Sean Christopherson
2021-05-08 3:31 ` Reiji Watanabe [this message]
2021-05-10 16:43 ` Sean Christopherson
2021-05-10 17:55 ` Reiji Watanabe
2021-05-10 8:25 ` Maxim Levitsky
2021-05-04 17:17 ` [PATCH 10/15] KVM: VMX: Use common x86's uret MSR list as the one true list Sean Christopherson
2021-05-10 8:25 ` Maxim Levitsky
2021-05-04 17:17 ` [PATCH 11/15] KVM: VMX: Disable loading of TSX_CTRL MSR the more conventional way Sean Christopherson
2021-05-05 8:49 ` Paolo Bonzini
2021-05-05 15:36 ` Sean Christopherson
2021-05-05 15:50 ` Paolo Bonzini
2021-05-10 8:26 ` Maxim Levitsky
2021-05-04 17:17 ` [PATCH 12/15] KVM: x86: Export the number of uret MSRs to vendor modules Sean Christopherson
2021-05-10 8:27 ` Maxim Levitsky
2021-05-04 17:17 ` [PATCH 13/15] KVM: x86: Move uret MSR slot management to common x86 Sean Christopherson
2021-05-10 8:28 ` Maxim Levitsky
2021-05-04 17:17 ` [PATCH 14/15] KVM: x86: Tie Intel and AMD behavior for MSR_TSC_AUX to guest CPU model Sean Christopherson
2021-05-10 8:29 ` Maxim Levitsky
2021-05-10 16:50 ` Sean Christopherson
2021-05-10 17:11 ` Jim Mattson
2021-05-11 12:34 ` Maxim Levitsky
2021-05-04 17:17 ` [PATCH 15/15] KVM: x86: Hide RDTSCP and RDPID if MSR_TSC_AUX probing failed Sean Christopherson
2021-05-10 8:29 ` Maxim Levitsky
2021-05-05 8:51 ` [PATCH 00/15] KVM: x86: RDPID/RDTSCP fixes and uret MSR cleanups Paolo Bonzini
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