From: Juergen Gross <jgross@suse.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: wei.liu2@citrix.com, George.Dunlap@eu.citrix.com,
andrew.cooper3@citrix.com, ian.jackson@eu.citrix.com,
Dario Faggioli <dfaggioli@suse.com>,
xen-devel@lists.xenproject.org
Subject: Re: [PATCH RFC v2 00/12] xen/x86: use per-vcpu stacks for 64 bit pv domains
Date: Tue, 23 Jan 2018 10:45:38 +0100 [thread overview]
Message-ID: <b364663b-7a2a-c00c-6251-c603f03c551f@suse.com> (raw)
In-Reply-To: <5A67030F02000078001A164B@suse.com>
On 23/01/18 09:40, Jan Beulich wrote:
>>>> On 23.01.18 at 06:50, <jgross@suse.com> wrote:
>> On 22/01/18 17:51, Jan Beulich wrote:
>>> But isn't that model having the same synchronization issues upon
>>> guest L4 updates which Andrew was fighting with?
>>
>> I don't think so, as the number of shadows will always only be max. 1
>> with my approach.
>
> How can I know that? The overview mail doesn't talk about the
> intended shadowing algorithm afaics, and none of the patches
> (judging by their titles) implements any part thereof. In
Right. That's the reason I'm telling you about it.
> particular I'd be curious to know whether what you say will
> hold also for guests not making use of the intended PV ABI
> extension.
Those guests will still be vulnerable to cross-vcpu accesses to Xen
stacks regarding Meltdown. Linux kernel is vulnerable the same way
regarding its own stacks, so there is no new vulnerability added
for Linux running as pv guests (I have to admit I don't know whether
the same applies to BSD).
Juergen
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next prev parent reply other threads:[~2018-01-23 9:45 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-22 12:32 [PATCH RFC v2 00/12] xen/x86: use per-vcpu stacks for 64 bit pv domains Juergen Gross
2018-01-22 12:32 ` [PATCH RFC v2 01/12] x86: cleanup processor.h Juergen Gross
2018-01-22 12:52 ` Jan Beulich
[not found] ` <5A65ECA502000078001A111C@suse.com>
2018-01-22 14:10 ` Juergen Gross
2018-01-22 14:25 ` Andrew Cooper
2018-01-22 14:32 ` Jan Beulich
2018-01-22 12:32 ` [PATCH RFC v2 02/12] x86: don't use hypervisor stack size for dumping guest stacks Juergen Gross
2018-01-23 9:26 ` Jan Beulich
[not found] ` <5A670DEF02000078001A16AF@suse.com>
2018-01-23 9:58 ` Juergen Gross
2018-01-23 10:11 ` Jan Beulich
[not found] ` <5A67187C02000078001A1742@suse.com>
2018-01-23 10:19 ` Juergen Gross
2018-01-22 12:32 ` [PATCH RFC v2 03/12] x86: do a revert of e871e80c38547d9faefc6604532ba3e985e65873 Juergen Gross
2018-01-22 12:32 ` [PATCH RFC v2 04/12] x86: revert 5784de3e2067ed73efc2fe42e62831e8ae7f46c4 Juergen Gross
2018-01-22 12:32 ` [PATCH RFC v2 05/12] x86: don't access saved user regs via rsp in trap handlers Juergen Gross
2018-01-30 14:49 ` Jan Beulich
[not found] ` <5A70941B02000078001A3BF0@suse.com>
2018-01-30 16:33 ` Juergen Gross
2018-01-22 12:32 ` [PATCH RFC v2 06/12] x86: add a xpti command line parameter Juergen Gross
2018-01-30 15:39 ` Jan Beulich
[not found] ` <5A709FDF02000078001A3C2C@suse.com>
2018-01-30 16:51 ` Juergen Gross
2018-01-22 12:32 ` [PATCH RFC v2 07/12] x86: allow per-domain mappings without NX bit or with specific mfn Juergen Gross
2018-01-29 17:06 ` Jan Beulich
[not found] ` <5A6F62B602000078001A3810@suse.com>
2018-01-30 8:02 ` Juergen Gross
2018-01-30 8:41 ` Jan Beulich
2018-01-31 10:30 ` Jan Beulich
2018-01-22 12:32 ` [PATCH RFC v2 08/12] xen/x86: use dedicated function for tss initialization Juergen Gross
2018-01-22 12:32 ` [PATCH RFC v2 09/12] x86: enhance syscall stub to work in per-domain mapping Juergen Gross
2018-01-30 15:11 ` Jan Beulich
[not found] ` <5A70991902000078001A3C16@suse.com>
2018-01-30 16:50 ` Juergen Gross
2018-01-22 12:32 ` [PATCH RFC v2 10/12] x86: allocate per-vcpu stacks for interrupt entries Juergen Gross
2018-01-30 15:40 ` Jan Beulich
2018-02-09 12:35 ` Juergen Gross
2018-02-13 9:10 ` Jan Beulich
[not found] ` <5A70A01402000078001A3C30@suse.com>
2018-01-30 17:12 ` Juergen Gross
2018-01-31 10:18 ` Jan Beulich
2018-01-22 12:32 ` [PATCH RFC v2 11/12] x86: modify interrupt handlers to support stack switching Juergen Gross
2018-01-30 16:07 ` Jan Beulich
[not found] ` <5A70A63D02000078001A3C7C@suse.com>
2018-01-30 17:19 ` Juergen Gross
2018-01-31 10:36 ` Jan Beulich
[not found] ` <5A71AA4202000078001A3F56@suse.com>
2018-02-02 15:42 ` Juergen Gross
2018-01-22 12:32 ` [PATCH RFC v2 12/12] x86: activate per-vcpu stacks in case of xpti Juergen Gross
2018-01-30 16:33 ` Jan Beulich
[not found] ` <5A70AC7F02000078001A3CA6@suse.com>
2018-01-30 17:33 ` Juergen Gross
2018-01-31 10:40 ` Jan Beulich
2018-01-22 12:50 ` [PATCH RFC v2 00/12] xen/x86: use per-vcpu stacks for 64 bit pv domains Jan Beulich
[not found] ` <5A65EC0A02000078001A1118@suse.com>
2018-01-22 14:18 ` Juergen Gross
2018-01-22 14:22 ` Jan Beulich
[not found] ` <5A6601D302000078001A1230@suse.com>
2018-01-22 14:38 ` Juergen Gross
2018-01-22 14:48 ` Jan Beulich
[not found] ` <5A6607DB02000078001A127B@suse.com>
2018-01-22 15:00 ` Juergen Gross
2018-01-22 16:51 ` Jan Beulich
2018-01-22 18:39 ` Andrew Cooper
2018-01-22 18:48 ` George Dunlap
2018-01-22 19:02 ` Andrew Cooper
2018-01-23 8:36 ` Jan Beulich
2018-01-23 11:23 ` Andrew Cooper
2018-01-23 11:06 ` George Dunlap
2018-01-23 6:34 ` Juergen Gross
2018-01-23 7:21 ` Juergen Gross
2018-01-23 8:53 ` Jan Beulich
[not found] ` <5A67061F02000078001A1669@suse.com>
2018-01-23 9:24 ` Juergen Gross
2018-01-23 9:31 ` Jan Beulich
[not found] ` <5A670F0E02000078001A16C9@suse.com>
2018-01-23 10:10 ` Juergen Gross
2018-01-23 11:45 ` Andrew Cooper
2018-01-23 13:31 ` Juergen Gross
2018-01-23 13:24 ` Dario Faggioli
2018-01-23 16:45 ` George Dunlap
2018-01-23 16:56 ` Juergen Gross
2018-01-23 17:33 ` George Dunlap
2018-01-24 7:37 ` Jan Beulich
[not found] ` <5A6624A602000078001A1375@suse.com>
2018-01-23 5:50 ` Juergen Gross
2018-01-23 8:40 ` Jan Beulich
[not found] ` <5A67030F02000078001A164B@suse.com>
2018-01-23 9:45 ` Juergen Gross [this message]
2018-01-22 21:45 ` Konrad Rzeszutek Wilk
2018-01-23 6:38 ` Juergen Gross
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