From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Jan Beulich <jbeulich@suse.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: "Wei Liu" <wl@xen.org>, "Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH 5/7] x86emul: vendor specific SYSENTER/SYSEXIT behavior in long mode
Date: Wed, 25 Mar 2020 14:15:59 +0000 [thread overview]
Message-ID: <91a633e1-ee5a-7903-b61f-e7905931d3b1@citrix.com> (raw)
In-Reply-To: <8cf000a6-a8ac-22b6-422d-c11dc8b6454a@suse.com>
On 24/03/2020 16:28, Jan Beulich wrote:
> Intel CPUs permit both insns there while AMD ones don't.
>
> While at it also
> - drop the ring 0 check from SYSENTER handling - neither Intel's nor
> AMD's insn pages have any indication of #GP(0) getting raised when
> executed from ring 0, and trying it out in practice also confirms
> the check shouldn't be there,
> - move SYSENTER segment register writing until after the (in principle
> able to fail) MSR reads.
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
next prev parent reply other threads:[~2020-03-25 14:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-24 16:18 [Xen-devel] [PATCH 0/7] x86emul: (mainly) vendor specific behavior adjustments Jan Beulich
2020-03-24 16:26 ` [Xen-devel] [PATCH 1/7] x86emul: add wrappers to check for AMD-like behavior Jan Beulich
2020-03-25 13:26 ` Andrew Cooper
2020-03-24 16:26 ` [Xen-devel] [PATCH 2/7] x86emul: vendor specific near RET behavior in 64-bit mode Jan Beulich
2020-03-25 13:36 ` Andrew Cooper
2020-03-24 16:27 ` [Xen-devel] [PATCH 3/7] x86emul: vendor specific direct branch " Jan Beulich
2020-03-25 14:10 ` Andrew Cooper
2020-03-24 16:27 ` [Xen-devel] [PATCH 4/7] x86emul: vendor specific near indirect " Jan Beulich
2020-03-25 14:11 ` Andrew Cooper
2020-03-24 16:28 ` [Xen-devel] [PATCH 5/7] x86emul: vendor specific SYSENTER/SYSEXIT behavior in long mode Jan Beulich
2020-03-25 14:15 ` Andrew Cooper [this message]
2020-03-24 16:28 ` [Xen-devel] [PATCH 6/7] x86emul: vendor specific SYSCALL behavior Jan Beulich
2020-03-25 9:44 ` Andrew Cooper
2020-03-24 16:29 ` [Xen-devel] [PATCH 7/7] x86emul: support SYSRET Jan Beulich
2020-03-25 10:00 ` Andrew Cooper
2020-03-25 10:19 ` Jan Beulich
2020-03-25 10:47 ` Andrew Cooper
2020-03-25 11:55 ` Jan Beulich
2020-03-25 12:25 ` Andrew Cooper
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