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From: Ankur Arora <ankur.a.arora@oracle.com>
To: Juergen Gross <jgross@suse.com>,
	Joao Martins <joao.m.martins@oracle.com>
Cc: sstabellini@kernel.org, konrad.wilk@oracle.com,
	linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org,
	pbonzini@redhat.com, boris.ostrovsky@oracle.com
Subject: Re: [Xen-devel] [RFC PATCH 00/16] xenhost support
Date: Fri, 7 Jun 2019 22:50:32 -0700
Message-ID: <29e94cec-66ae-baf0-d189-f9487ce162a7@oracle.com> (raw)
In-Reply-To: <c73a6ec5-687e-d3ef-e5d7-5700d240b4ec@suse.com>

On 2019-06-07 9:21 a.m., Juergen Gross wrote:
> On 07.06.19 17:22, Joao Martins wrote:
>> On 6/7/19 3:51 PM, Juergen Gross wrote:
>>> On 09.05.19 19:25, Ankur Arora wrote:
>>>> Hi all,
>>>>
>>>> This is an RFC for xenhost support, outlined here by Juergen here:
>>>> https://lkml.org/lkml/2019/4/8/67.
>>>
>>> First: thanks for all the effort you've put into this series!
>>>
>>>> The high level idea is to provide an abstraction of the Xen
>>>> communication interface, as a xenhost_t.
>>>>
>>>> xenhost_t expose ops for communication between the guest and Xen
>>>> (hypercall, cpuid, shared_info/vcpu_info, evtchn, grant-table and on 
>>>> top
>>>> of those, xenbus, ballooning), and these can differ based on the kind
>>>> of underlying Xen: regular, local, and nested.
>>>
>>> I'm not sure we need to abstract away hypercalls and cpuid. I believe in
>>> case of nested Xen all contacts to the L0 hypervisor should be done via
>>> the L1 hypervisor. So we might need to issue some kind of passthrough
>>> hypercall when e.g. granting a page to L0 dom0, but this should be
>>> handled via the grant abstraction (events should be similar).
>>>
>> Just to be clear: By "kind of passthrough hypercall" you mean (e.g. 
>> for every
>> access/modify of grant table frames) you would proxy hypercall to L0 
>> Xen via L1 Xen?
> 
> It might be possible to spare some hypercalls by directly writing to
> grant frames mapped into L1 dom0, but in general you are right.
Wouldn't we still need map/unmap_grant_ref?
AFAICS, both the xenhost_direct and the xenhost_indirect cases should be
very similar (apart from the need to proxy in the indirect case.)

Ankur

> 
> 
> Juergen
> 
> _______________________________________________
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> https://lists.xenproject.org/mailman/listinfo/xen-devel


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Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-09 17:25 Ankur Arora
2019-05-09 17:25 ` [Xen-devel] [RFC PATCH 01/16] x86/xen: add xenhost_t interface Ankur Arora
2019-06-07 15:04   ` Juergen Gross
2019-06-11  7:16     ` Ankur Arora
2019-06-14 11:52       ` Juergen Gross
2019-05-09 17:25 ` Ankur Arora
2019-05-09 17:25 ` [RFC PATCH 02/16] x86/xen: cpuid support in xenhost_t Ankur Arora
2019-05-09 17:25   ` [Xen-devel] " Ankur Arora
2019-06-12 21:09   ` Andrew Cooper
2019-05-09 17:25 ` [Xen-devel] [RFC PATCH 03/16] x86/xen: make hypercall_page generic Ankur Arora
2019-05-09 17:25 ` Ankur Arora
2019-05-09 17:25 ` [RFC PATCH 04/16] x86/xen: hypercall support for xenhost_t Ankur Arora
2019-05-09 17:25 ` [Xen-devel] " Ankur Arora
2019-06-12 21:15   ` Andrew Cooper
2019-06-14  7:20     ` Ankur Arora
2019-06-14  7:35       ` Juergen Gross
2019-06-14  8:00         ` Andrew Cooper
2019-05-09 17:25 ` [RFC PATCH 05/16] x86/xen: add feature support in xenhost_t Ankur Arora
2019-05-09 17:25 ` [Xen-devel] " Ankur Arora
2019-05-09 17:25 ` [Xen-devel] [RFC PATCH 06/16] x86/xen: add shared_info support to xenhost_t Ankur Arora
2019-06-07 15:08   ` Juergen Gross
2019-06-08  5:01     ` Ankur Arora
2019-05-09 17:25 ` Ankur Arora
2019-05-09 17:25 ` [RFC PATCH 07/16] x86/xen: make vcpu_info part of xenhost_t Ankur Arora
2019-05-09 17:25   ` [Xen-devel] " Ankur Arora
2019-06-14 11:53   ` Juergen Gross
2019-06-17  6:28     ` Ankur Arora
2019-05-09 17:25 ` [RFC PATCH 08/16] x86/xen: irq/upcall handling with multiple xenhosts Ankur Arora
2019-05-09 17:25 ` [Xen-devel] " Ankur Arora
2019-06-14 12:01   ` Juergen Gross
2019-05-09 17:25 ` [RFC PATCH 09/16] xen/evtchn: support evtchn in xenhost_t Ankur Arora
2019-05-09 17:25 ` [Xen-devel] " Ankur Arora
2019-06-14 12:04   ` Juergen Gross
2019-06-17  6:09     ` Ankur Arora
2019-05-09 17:25 ` [RFC PATCH 10/16] xen/balloon: support ballooning " Ankur Arora
2019-05-09 17:25 ` [Xen-devel] " Ankur Arora
2019-06-17  9:28   ` Juergen Gross
2019-06-19  2:24     ` Ankur Arora
2019-05-09 17:25 ` [RFC PATCH 11/16] xen/grant-table: make grant-table xenhost aware Ankur Arora
2019-05-09 17:25   ` [Xen-devel] " Ankur Arora
2019-06-17  9:36   ` Juergen Gross
2019-06-19  2:25     ` Ankur Arora
2019-05-09 17:25 ` [RFC PATCH 12/16] xen/xenbus: support xenbus frontend/backend with xenhost_t Ankur Arora
2019-05-09 17:25 ` [Xen-devel] " Ankur Arora
2019-06-17  9:50   ` Juergen Gross
2019-06-19  2:38     ` Ankur Arora
2019-05-09 17:25 ` [Xen-devel] [RFC PATCH 13/16] drivers/xen: gnttab, evtchn, xenbus API changes Ankur Arora
2019-06-17 10:07   ` Juergen Gross
2019-06-19  2:55     ` Ankur Arora
2019-05-09 17:25 ` Ankur Arora
2019-05-09 17:25 ` [Xen-devel] [RFC PATCH 14/16] xen/blk: " Ankur Arora
2019-06-17 10:14   ` Juergen Gross
2019-06-19  2:59     ` Ankur Arora
2019-05-09 17:25 ` Ankur Arora
2019-05-09 17:25 ` [RFC PATCH 15/16] xen/net: " Ankur Arora
2019-05-09 17:25 ` [Xen-devel] " Ankur Arora
2019-06-17 10:14   ` Juergen Gross
2019-05-09 17:25 ` [Xen-devel] [RFC PATCH 16/16] xen/grant-table: host_addr fixup in mapping on xenhost_r0 Ankur Arora
2019-06-17 10:55   ` Juergen Gross
2019-06-19  3:02     ` Ankur Arora
2019-05-09 17:25 ` Ankur Arora
2019-06-07 14:51 ` [Xen-devel] [RFC PATCH 00/16] xenhost support Juergen Gross
2019-06-07 15:22   ` Joao Martins
2019-06-07 16:21     ` Juergen Gross
2019-06-08  5:50       ` Ankur Arora [this message]
2019-06-08  5:33   ` Ankur Arora

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