From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Paolo Bonzini <pbonzini@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 10/10] KVM: VMX: Convert vcpu_vmx.exit_reason to a union
Date: Mon, 16 Mar 2020 22:28:21 -0700 [thread overview]
Message-ID: <20200317052821.GP24267@linux.intel.com> (raw)
In-Reply-To: <87eetwnxsu.fsf@vitty.brq.redhat.com>
On Fri, Mar 13, 2020 at 03:18:09PM +0100, Vitaly Kuznetsov wrote:
> Sean Christopherson <sean.j.christopherson@intel.com> writes:
> > diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
> > index e64da06c7009..2d9a005d11ab 100644
> > --- a/arch/x86/kvm/vmx/vmx.h
> > +++ b/arch/x86/kvm/vmx/vmx.h
> > @@ -93,6 +93,29 @@ struct pt_desc {
> > struct pt_ctx guest;
> > };
> >
> > +union vmx_exit_reason {
> > + struct {
> > + u32 basic : 16;
> > + u32 reserved16 : 1;
> > + u32 reserved17 : 1;
> > + u32 reserved18 : 1;
> > + u32 reserved19 : 1;
> > + u32 reserved20 : 1;
> > + u32 reserved21 : 1;
> > + u32 reserved22 : 1;
> > + u32 reserved23 : 1;
> > + u32 reserved24 : 1;
> > + u32 reserved25 : 1;
> > + u32 reserved26 : 1;
> > + u32 enclave_mode : 1;
> > + u32 smi_pending_mtf : 1;
> > + u32 smi_from_vmx_root : 1;
> > + u32 reserved30 : 1;
> > + u32 failed_vmentry : 1;
>
> Just wondering, is there any particular benefit in using 'u32' instead
> of 'u16' here?
Not that I know of. Paranoia that the compiler will do something weird?
> > + };
> > + u32 full;
> > +};
> > +
> > /*
> > * The nested_vmx structure is part of vcpu_vmx, and holds information we need
> > * for correct emulation of VMX (i.e., nested VMX) on this vcpu.
> > @@ -263,7 +286,7 @@ struct vcpu_vmx {
> > int vpid;
> > bool emulation_required;
> >
> > - u32 exit_reason;
> > + union vmx_exit_reason exit_reason;
> >
> > /* Posted interrupt descriptor */
> > struct pi_desc pi_desc;
>
> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
>
> --
> Vitaly
>
next prev parent reply other threads:[~2020-03-17 5:28 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-12 18:45 [PATCH 00/10] KVM: VMX: Unionize vcpu_vmx.exit_reason Sean Christopherson
2020-03-12 18:45 ` [PATCH 01/10] KVM: nVMX: Move reflection check into nested_vmx_reflect_vmexit() Sean Christopherson
2020-03-13 12:12 ` Vitaly Kuznetsov
2020-03-17 5:33 ` Sean Christopherson
2020-03-17 16:16 ` Sean Christopherson
2020-03-17 17:00 ` Vitaly Kuznetsov
2020-03-17 17:38 ` Paolo Bonzini
2020-03-17 18:01 ` Sean Christopherson
2020-03-12 18:45 ` [PATCH 02/10] KVM: nVMX: Drop a superfluous WARN on reflecting EXTERNAL_INTERRUPT Sean Christopherson
2020-03-13 12:14 ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 03/10] KVM: nVMX: Pull exit_reason from vcpu_vmx in nested_vmx_exit_reflected() Sean Christopherson
2020-03-13 12:38 ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 04/10] KVM: VMX: Convert local exit_reason to u16 " Sean Christopherson
2020-03-13 12:47 ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 05/10] KVM: VMX: Convert local exit_reason to u16 in vmx_handle_exit() Sean Christopherson
2020-03-13 13:48 ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 06/10] KVM: nVMX: Convert local exit_reason to u16 in ...enter_non_root_mode() Sean Christopherson
2020-03-13 13:55 ` Vitaly Kuznetsov
2020-03-13 14:00 ` David Laight
2020-03-17 5:29 ` Sean Christopherson
2020-03-17 17:40 ` Paolo Bonzini
2020-03-12 18:45 ` [PATCH 07/10] KVM: nVMX: Cast exit_reason to u16 to check for nested EXTERNAL_INTERRUPT Sean Christopherson
2020-03-13 13:56 ` Vitaly Kuznetsov
2020-03-12 18:45 ` [PATCH 08/10] KVM: nVMX: Rename exit_reason to vm_exit_reason for nested VM-Exit Sean Christopherson
2020-03-13 14:01 ` Vitaly Kuznetsov
2020-03-13 16:17 ` Sean Christopherson
2020-03-12 18:45 ` [PATCH 09/10] KVM: VMX: Cache vmx->exit_reason in local u16 in vmx_handle_exit_irqoff() Sean Christopherson
2020-03-13 14:09 ` Vitaly Kuznetsov
2020-03-17 17:50 ` Paolo Bonzini
2020-03-12 18:45 ` [PATCH 10/10] KVM: VMX: Convert vcpu_vmx.exit_reason to a union Sean Christopherson
2020-03-13 14:18 ` Vitaly Kuznetsov
2020-03-17 5:28 ` Sean Christopherson [this message]
2020-03-17 17:51 ` Paolo Bonzini
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