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Re: [Xen-devel] [PATCH v2] x86/vm_event: add gdtr_base to the vm_event structure
- To: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 3 May 2019 00:42:41 +0100
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- Cc: Wei Liu <wei.liu2@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Thu, 02 May 2019 23:42:52 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 02/05/2019 23:40, Tamas K Lengyel wrote:
>> @@ -211,13 +212,14 @@ struct vm_event_regs_x86 {
>> struct vm_event_x86_selector_reg fs;
>> struct vm_event_x86_selector_reg gs;
>> uint64_t shadow_gs;
>> + uint16_t gdtr_limit;
> Whoops, just noticed that limit actually needs 20-bits. I'll just grow
> this to 32 and drop the pad at the end.
There is no such thing as a GDT or an IDT with a limit beyond 16 bits.
(Furthermore, an IDT with a limit beyond 12 bits is just a waste of memory).
VT-x performs a consistency check on every vmentry that the
VMCS_{G,I}DTR_LIMIT fields are within 16 bits, despite being encoded as
32bit fields. SVM specifies the higher 16 bits as ignored.
~Andrew
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