From: Wei Liu <wl@xen.org>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Xen-devel <xen-devel@lists.xenproject.org>,
"Wei Liu" <wl@xen.org>, "Jan Beulich" <JBeulich@suse.com>,
"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH] x86/boot: Clean up the trampoline transition into Long mode
Date: Thu, 2 Jan 2020 16:55:15 +0000 [thread overview]
Message-ID: <20200102165515.4brbqceseurokvp3@debian> (raw)
In-Reply-To: <20200102145953.6503-1-andrew.cooper3@citrix.com>
On Thu, Jan 02, 2020 at 02:59:53PM +0000, Andrew Cooper wrote:
> The jmp after setting %cr0 is redundant with the following ljmp.
>
> The CPUID to protect the jump to higher mappings was inserted due to an
> abundance of caution/paranoia before Spectre was public. There is not a
> matching protection in the S3 resume path, and there is nothing
> interesting in memory at this point.
What do you mean by "there is nothing interesting in memory" here?
As far as I can tell idel page table has been loaded. During AP
bring-up it contains runtime data, no?
Wei.
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next prev parent reply other threads:[~2020-01-02 16:55 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-02 14:59 [Xen-devel] [PATCH] x86/boot: Clean up the trampoline transition into Long mode Andrew Cooper
2020-01-02 16:55 ` Wei Liu [this message]
2020-01-02 17:20 ` Andrew Cooper
2020-01-02 18:45 ` Wei Liu
2020-01-03 13:36 ` Jan Beulich
2020-01-03 13:44 ` Andrew Cooper
2020-01-03 13:52 ` Jan Beulich
2020-01-03 14:25 ` Andrew Cooper
2020-01-03 14:34 ` Jan Beulich
2020-01-03 18:55 ` Andrew Cooper
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