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Re: [Xen-devel] [PATCH v2 5/5] x86: Reorganise and rename debug register fields in struct vcpu


  • To: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Mon, 15 Oct 2018 14:32:18 +0100
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  • Cc: Kevin Tian <kevin.tian@xxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, Brian Woods <brian.woods@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Mon, 15 Oct 2018 13:32:25 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 15/10/18 14:28, Boris Ostrovsky wrote:
> On 10/15/18 6:36 AM, Andrew Cooper wrote:
>>  
>> @@ -567,7 +573,10 @@ struct arch_vcpu
>>      void              *fpu_ctxt;
>>      unsigned long      vgc_flags;
>>      struct cpu_user_regs user_regs;
>> -    unsigned long      debugreg[8];
>> +
>> +    /* Debug registers. */
>> +    unsigned long dr[4], dr7;
>> +    unsigned int dr6;
> Why are dr6 and dr7 different types? They are both MBZ in upper bits in
> 64-bit mode, aren't they?

Correct.  They should both be 32 bits wide, but __vmread() needs to take
dr7 by unsigned long *

~Andrew

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