linux-kernel - Re: [PATCH v7 08/12] x86/tdx: Add HLT support for TDX guest

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Date:   Fri, 24 Sep 2021 13:00:02 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Juergen Gross <jgross@...e.com>, Deep Shah <sdeep@...are.com>,
        VMware Inc <pv-drivers@...are.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, Peter H Anvin <hpa@...or.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 08/12] x86/tdx: Add HLT support for TDX guest



On 9/23/21 12:33 PM, Kuppuswamy, Sathyanarayanan wrote:
>> Is that explained in the comment in _tdx_halt() where irqs_disabled
>> tells the VMM what to do with the guest - to wake it up or to keep it in
>> virtual halt?
> 
> I think it is left in halt state. Sean, any comment?

I inquired about it and found that the guest will be left in halt
state after non-safe halt call. It is mainly used in CPU off-lining
process.

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer