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From: Razvan Cojocaru <rzvncj@gmail.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: RIP register value in p2m_mem_access_check()
Date: Wed, 06 Mar 2013 13:35:04 +0200	[thread overview]
Message-ID: <513729E8.2060007@gmail.com> (raw)
In-Reply-To: <5137335602000078000C3815@nat28.tlf.novell.com>

> v->arch.user_regs.eip is what you should look at. It's
> expected to be in sync with the VMCS value as long as
> nothing (e.g. emulation) modified the value. There's code in
> vmx_asm_vmexit_handler to sync the fields, and in
> vmx_asm_do_vmentry to sync them back in the opposite
> direction.

Thank you for your answer. Isn't it possible that emulation is indeed 
involved, since in p2m_mem_access_check() a page fault has occured, and 
RIP might point to _after_ the offending instruction?


Thanks,
Razvan Cojocaru

  reply	other threads:[~2013-03-06 11:35 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-06 10:55 RIP register value in p2m_mem_access_check() Razvan Cojocaru
2013-03-06 11:15 ` Jan Beulich
2013-03-06 11:35   ` Razvan Cojocaru [this message]
2013-03-06 13:22     ` Jan Beulich
2013-03-06 13:25       ` Razvan Cojocaru
2013-03-06 13:49       ` Razvan Cojocaru
2013-03-06 14:26         ` Razvan Cojocaru
2013-03-06 14:33         ` Jan Beulich
2013-03-06 14:47           ` Razvan Cojocaru
2013-03-07 16:49           ` Tim Deegan
2013-03-07 17:04             ` Jan Beulich
2013-03-07 17:31             ` Razvan Cojocaru

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