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From: Juergen Gross <jgross@suse.com>
To: Joao Martins <joao.m.martins@oracle.com>
Cc: sstabellini@kernel.org, konrad.wilk@oracle.com,
	linux-kernel@vger.kernel.org,
	Ankur Arora <ankur.a.arora@oracle.com>,
	pbonzini@redhat.com, xen-devel@lists.xenproject.org,
	boris.ostrovsky@oracle.com
Subject: Re: [Xen-devel] [RFC PATCH 00/16] xenhost support
Date: Fri, 7 Jun 2019 18:21:16 +0200
Message-ID: <c73a6ec5-687e-d3ef-e5d7-5700d240b4ec@suse.com> (raw)
In-Reply-To: <ede6db03-121c-9ec6-f8eb-dbcc605977b4@oracle.com>

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.


Juergen

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  reply index

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 [this message]
2019-06-08  5:50       ` Ankur Arora
2019-06-08  5:33   ` Ankur Arora

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