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Re: [Xen-devel] [PATCH v2 14/16] x86: make entry point code build when !CONFIG_PV
- To: Jan Beulich <JBeulich@xxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 2 Nov 2018 14:14:23 +0000
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 02 Nov 2018 14:14:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 02/11/18 13:45, Jan Beulich wrote:
>>>> On 02.11.18 at 14:08, <wei.liu2@xxxxxxxxxx> wrote:
>> On Mon, Oct 29, 2018 at 09:03:18AM -0600, Jan Beulich wrote:
>>>>>> On 19.10.18 at 16:28, <wei.liu2@xxxxxxxxxx> wrote:
>>>> @@ -548,10 +550,14 @@ ENTRY(ret_from_intr)
>>>> GET_CURRENT(bx)
>>>> testb $3, UREGS_cs(%rsp)
>>>> jz restore_all_xen
>>>> +#ifdef CONFIG_PV
>>>> movq VCPU_domain(%rbx), %rax
>>>> cmpb $0, DOMAIN_is_32bit_pv(%rax)
>>>> je test_all_events
>>>> jmp compat_test_all_events
>>>> +#else
>>>> + BUG
>>>> +#endif
>>> Hmm, not sure here (and elsewhere): Another option is to
>>> streamline execution by replacing the conditional branch with an
>>> unconditional one in the !PV case. Andrew, do you have any
>>> thoughts either way?
>> My original thought was to catch potential issues in Xen code which
>> messes up with the permission level. Using unconditional jump is fine
>> by me, too. But in that case I will seek to at least add an assertion
>> for debug build.
> Assertion additions are definitely fine with me.
Yeah - I'd also err on the side of an assertion and an unconditional jump.
~Andrew
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