linux-kernel - Re: [PATCH] x86/xen: fix booting 32-bit pv guest

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Date:   Thu, 9 Apr 2020 16:52:53 +0200
From:   Jürgen Groß <jgross@...e.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86/xen: fix booting 32-bit pv guest

On 09.04.20 16:44, Boris Ostrovsky wrote:
> 
> On 4/9/20 3:00 AM, Juergen Gross wrote:
>> Commit 2f62f36e62daec ("x86/xen: Make the boot CPU idle task reliable")
>> introduced a regression for booting 32 bit Xen PV guests: the address
>> of the initial stack needs to be a virtual one.
>>
>> Fixes: 2f62f36e62daec ("x86/xen: Make the boot CPU idle task reliable")
>> Signed-off-by: Juergen Gross <jgross@...e.com>
> 
> 
> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> 
> 
>> ---
>>   arch/x86/xen/xen-head.S | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
>> index 7d1c4fcbe8f7..1ba601df3a37 100644
>> --- a/arch/x86/xen/xen-head.S
>> +++ b/arch/x86/xen/xen-head.S
>> @@ -38,7 +38,7 @@ SYM_CODE_START(startup_xen)
>>   #ifdef CONFIG_X86_64
> 
> 
> While at it, I'd swap the ifdefs and fold x86_64 case into the one below.

I wanted to remove 32-bit PV support from the kernel soon, so I think
this can wait until then. :-)


Juergen