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From: "Jan Beulich" <JBeulich@suse.com>
To: Julien Grall <julien.grall@arm.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
	Xen-devel <xen-devel@lists.xen.org>
Subject: Re: [PATCH 1/9] x86/hypercall: Move some of the hvm hypercall infrastructure into hypercall.h
Date: Tue, 02 Aug 2016 09:05:47 -0600	[thread overview]
Message-ID: <57A0D2EB0200007800101E3E@prv-mh.provo.novell.com> (raw)
In-Reply-To: <b10b325b-d4a7-6d84-e2b7-fb82c8f8f04f@citrix.com>

>>> On 02.08.16 at 16:59, <andrew.cooper3@citrix.com> wrote:
> On 02/08/16 15:54, Jan Beulich wrote:
>>>>> On 02.08.16 at 16:26, <julien.grall@arm.com> wrote:
>>> On 02/08/16 15:17, Jan Beulich wrote:
>>>> Well, I find it quite odd for hypercall argument counts to differ
>>>> between arches. I.e. I'd conclude the ABI was mis-specified.
>>> Is it documented somewhere for the x86 code? Looking at Linux, the 
>>> privcmd call is only passing 5 arguments on both ARM and x86.
>> arch-x86/xen-x86_32.h has
>>
>>  * Hypercall interface:
>>  *  Input:  %ebx, %ecx, %edx, %esi, %edi, %ebp (arguments 1-6)
>>  *  Output: %eax
>>
>> while arch-x86/xen-x86_64.h has
>>
>>  * Hypercall interface:
>>  *  Input:  %rdi, %rsi, %rdx, %r10, %r8, %r9 (arguments 1-6)
>>  *  Output: %rax
> 
> The only actual 6 argument hypercall is the v4v hypercall, better known
> as __HYPERVISOR_xc_reserved_op at index 39, but that isn't implemented
> anywhere upstream.

But it serves as an example what now wouldn't work on ARM.

Jan


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  reply	other threads:[~2016-08-02 15:05 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-18  9:51 [PATCH 0/9] x86: Move the pv hypercall into C Andrew Cooper
2016-07-18  9:51 ` [PATCH 1/9] x86/hypercall: Move some of the hvm hypercall infrastructure into hypercall.h Andrew Cooper
2016-08-02 12:50   ` Jan Beulich
2016-08-02 13:14     ` Andrew Cooper
2016-08-02 13:28       ` Jan Beulich
2016-08-02 14:04         ` Julien Grall
2016-08-02 14:17           ` Jan Beulich
2016-08-02 14:26             ` Julien Grall
2016-08-02 14:54               ` Jan Beulich
2016-08-02 14:59                 ` Andrew Cooper
2016-08-02 15:05                   ` Jan Beulich [this message]
2016-08-02 18:43                     ` Stefano Stabellini
2016-08-03  8:53                       ` Jan Beulich
2016-08-03 10:55                         ` Julien Grall
2016-08-03 18:20                           ` Stefano Stabellini
2016-08-04 11:27                             ` Julien Grall
2016-07-18  9:51 ` [PATCH 2/9] x86/pv: Support do_set_segment_base() for compat guests Andrew Cooper
2016-08-02 12:52   ` Jan Beulich
2016-08-02 13:25     ` Andrew Cooper
2016-08-02 13:31       ` Jan Beulich
2016-08-02 13:39         ` Andrew Cooper
2016-08-02 13:47           ` Jan Beulich
2016-07-18  9:51 ` [PATCH 3/9] x86/hypercall: Move the hypercall arg tables into C Andrew Cooper
2016-08-02 12:59   ` Jan Beulich
2016-07-18  9:51 ` [PATCH 4/9] x86/pv: Implement pv_hypercall() in C Andrew Cooper
2016-08-02 13:12   ` Jan Beulich
2016-08-02 14:06     ` Andrew Cooper
2016-08-02 14:19       ` Jan Beulich
2016-08-11 11:57     ` Andrew Cooper
2016-08-11 12:20       ` Jan Beulich
2016-07-18  9:51 ` [PATCH 5/9] x86/hypercall: Move the hypercall tables into C Andrew Cooper
2016-08-02 13:23   ` Jan Beulich
2016-08-02 13:30     ` Andrew Cooper
2016-08-02 13:40       ` Jan Beulich
2016-08-11 12:00         ` Andrew Cooper
2016-07-18  9:51 ` [PATCH 6/9] xen/multicall: Rework arch multicall handling Andrew Cooper
2016-07-20 12:35   ` Julien Grall
2016-08-03 15:02   ` Jan Beulich
2016-08-03 15:12     ` Andrew Cooper
2016-07-18  9:51 ` [PATCH 7/9] x86/pv: Merge the pv hypercall tables Andrew Cooper
2016-08-03 15:07   ` Jan Beulich
2016-08-11 12:36     ` Andrew Cooper
2016-07-18  9:51 ` [PATCH 8/9] x86/hypercall: Merge the hypercall arg tables Andrew Cooper
2016-08-03 15:12   ` Jan Beulich
2016-08-03 15:15     ` Andrew Cooper
2016-08-03 15:28       ` Jan Beulich
2016-07-18  9:51 ` [PATCH 9/9] x86/hypercall: Reduce the size of the hypercall tables Andrew Cooper
2016-08-03 15:17   ` Jan Beulich

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