From: Jan Beulich <jbeulich@suse.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
"Wei Liu" <wl@xen.org>, "Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH v2 2/2] x86/desc: Build boot_{, compat_}gdt[] in C
Date: Mon, 12 Aug 2019 09:32:47 +0200 [thread overview]
Message-ID: <3b2ad6fb-d39f-e5b5-b35a-fc4ebfc695f3@suse.com> (raw)
In-Reply-To: <e686a008-1e0f-c82e-e9ab-83e966d11243@suse.com>
On 09.08.2019 12:40, Jan Beulich wrote:
> There is plenty more cleanup which can be done in the future. As we are
> 64-bit, there is no need for load_TR() to keep the TSS in sync between the two
> GDTs, which means it can drop all sgdt/lgdt instructions.
I'm trying to figure what exactly you mean here. Are you suggesting
we run with a TSS selector loaded whose descriptor's busy bit is
clear? I agree this shouldn't cause issues in the 64-bit world, but
it would still not feel right. Question is why they've retained the
avail/busy distinction in the first place.
Jan
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next prev parent reply other threads:[~2019-08-12 7:33 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-09 10:34 [Xen-devel] [PATCH v2 0/2] x86/boot: cleanup Jan Beulich
2019-08-09 10:38 ` [Xen-devel] [PATCH v2 1/2] x86: define a few selector values Jan Beulich
2019-08-09 11:50 ` Andrew Cooper
2019-08-09 12:35 ` Jan Beulich
2019-08-23 2:38 ` Tian, Kevin
2019-08-09 10:40 ` [Xen-devel] [PATCH v2 2/2] x86/desc: Build boot_{, compat_}gdt[] in C Jan Beulich
2019-08-09 12:19 ` Andrew Cooper
2019-08-09 12:43 ` Jan Beulich
2019-08-09 13:07 ` Andrew Cooper
2019-08-09 13:18 ` Jan Beulich
2019-08-09 15:25 ` Andrew Cooper
2019-08-12 7:32 ` Jan Beulich [this message]
2019-08-12 10:36 ` Andrew Cooper
2019-08-09 10:41 ` [Xen-devel] [PATCH v2 0/2] x86/boot: cleanup Jan Beulich
2019-08-09 12:39 ` [Xen-devel] [PATCH 3/2] x86/desc: Drop __HYPERVISOR_CS32 Andrew Cooper
2019-08-09 12:50 ` Jan Beulich
2019-08-09 15:36 ` Andrew Cooper
2019-08-09 15:52 ` Jan Beulich
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