linux-kernel - Re: [PATCH v2] x86/xen: avoid warning in Xen pv guest with CONFIG_AMD_MEM

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Date:   Wed, 27 Jan 2021 11:26:56 +0100
From:   Jürgen Groß <jgross@...e.com>
To:     Andrew Cooper <andrew.cooper3@...rix.com>,
        xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        stable@...r.kernel.org
Subject: Re: [PATCH v2] x86/xen: avoid warning in Xen pv guest with
 CONFIG_AMD_MEM_ENCRYPT enabled

On 27.01.21 10:43, Andrew Cooper wrote:
> On 27/01/2021 09:38, Juergen Gross wrote:
>> diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
>> index 4409306364dc..ca5ac10fcbf7 100644
>> --- a/arch/x86/xen/enlighten_pv.c
>> +++ b/arch/x86/xen/enlighten_pv.c
>> @@ -583,6 +583,12 @@ DEFINE_IDTENTRY_RAW(xenpv_exc_debug)
>>   		exc_debug(regs);
>>   }
>>   
>> +DEFINE_IDTENTRY_RAW(exc_xen_unknown_trap)
>> +{
>> +	/* This should never happen and there is no way to handle it. */
>> +	panic("Unknown trap in Xen PV mode.");
> 
> Looks much better.  How about including regs->entry_vector here, just to
> short circuit the inevitable swearing which will accompany encountering
> this panic() ?

You are aware the regs parameter is struct pt_regs *, not the Xen
struct cpu_user_regs *?

So I have no idea how I should get this information without creating
a per-vector handler.


Juergen

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