linux-kernel - Re: [RFC v2-fix 1/1] x86/boot: Add a trampoline for APs booting in 64-bit mode

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Message-ID: <2977129b-c568-8ce5-9a85-31473096719f@linux.intel.com>
Date:   Wed, 19 May 2021 17:42:44 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Raj Ashok <ashok.raj@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Kai Huang <kai.huang@...el.com>
Subject: Re: [RFC v2-fix 1/1] x86/boot: Add a trampoline for APs booting in
 64-bit mode



On 5/19/21 5:40 PM, Dan Williams wrote:
> I would clarify how the boot code uses this:
> 
> "When a bootloader hands off to the kernel in 32-bit mode an IDT with
> a 2-byte limit and 4-byte base is needed. When a boot loader hands off
> to a kernel 64-bit mode the base address extends to 8-bytes. Reserve
> enough space for either scenario."

I will add it. Thanks.

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer