linux-kernel - Re: [PATCH v4 17/20] KVM:x86: Enable CET virtualization for VMX and advertise to userspace

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Message-ID: <ZMIPeAHn5aN2HVS4@chao-email>
Date:   Thu, 27 Jul 2023 14:32:24 +0800
From:   Chao Gao <chao.gao@...el.com>
To:     Yang Weijiang <weijiang.yang@...el.com>
CC:     <seanjc@...gle.com>, <pbonzini@...hat.com>, <peterz@...radead.org>,
        <john.allen@....com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <rick.p.edgecombe@...el.com>,
        <binbin.wu@...ux.intel.com>
Subject: Re: [PATCH v4 17/20] KVM:x86: Enable CET virtualization for VMX and
 advertise to userspace

On Thu, Jul 20, 2023 at 11:03:49PM -0400, Yang Weijiang wrote:
> 	vmcs_conf->size = vmx_msr_high & 0x1fff;
>-	vmcs_conf->basic_cap = vmx_msr_high & ~0x1fff;
>+	vmcs_conf->basic_cap = vmx_msr_high & ~0x7fff;

why bit 13 and 14 are masked here?