From: Avi Kivity <avi@redhat.com>
To: Marek Olszewski <mareko@csail.mit.edu>
Cc: kvm@vger.kernel.org
Subject: Re: KVM Page Fault Question
Date: Fri, 02 Apr 2010 09:39:19 +0300 [thread overview]
Message-ID: <4BB59117.2040903@redhat.com> (raw)
In-Reply-To: <4BB57596.6090109@csail.mit.edu>
On 04/02/2010 07:41 AM, Marek Olszewski wrote:
> When a guest OS writes to a shadowed (and therefore page protected)
> guest page table, does the resulting page fault get handled in
> paging_tmpl.h:xxx_page_fault or does it call some rmap related code
> directly?
page faults are dispatched to the page_fault callback.
> Also, what does the "direct" mmu page role mean?
>
It means that the page maps the linear range (gfn << 12)..(((gfn + (1 <<
level*9))) << 12) instead of shadowing a guest page table at gfn.
Useful for real mode, large pages, and tdp.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2010-04-02 6:39 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-10 4:57 Shadow page table questions Marek Olszewski
2010-03-10 9:47 ` Avi Kivity
2010-03-11 0:06 ` Marek Olszewski
2010-03-11 6:39 ` Avi Kivity
2010-03-11 16:14 ` Marek Olszewski
2010-03-13 8:51 ` Avi Kivity
2010-03-18 23:50 ` KVM Page Fault Question Marek Olszewski
2010-03-19 8:39 ` Avi Kivity
2010-04-02 4:41 ` Marek Olszewski
2010-04-02 6:39 ` Avi Kivity [this message]
[not found] ` <4BB614BC.9080608@csail.mit.edu>
2010-04-04 16:59 ` Avi Kivity
2010-04-22 5:26 ` Marek Olszewski
2010-04-22 6:52 ` Avi Kivity
[not found] ` <4BD0DFBE.1090103@csail.mit.edu>
2010-04-26 5:42 ` Marek Olszewski
2010-05-20 2:24 ` Shadow MMU state preserved across kvm_mmu_zap_all? Marek Olszewski
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