From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: [PATCH 7/8] docs: Document start_info changes in Xen 4.2. Date: Mon, 28 Jan 2013 13:32:09 -0500 Message-ID: <1359397930-9311-8-git-send-email-konrad.wilk@oracle.com> References: <1359397930-9311-1-git-send-email-konrad.wilk@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1359397930-9311-1-git-send-email-konrad.wilk@oracle.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xen.org Cc: Konrad Rzeszutek Wilk List-Id: xen-devel@lists.xenproject.org The git commit 7a9d7646307b7c872b8dbd7546579acd3b54223d "x86/32-on-64: adjust Dom0 initial page table layout" fixes a bug in the reported value of pt_base versus what is stored in the %cr3 register. This documents this in the start of the world header note. Signed-off-by: Konrad Rzeszutek Wilk --- xen/include/public/xen.h | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h index c50bbfc..1685317 100644 --- a/xen/include/public/xen.h +++ b/xen/include/public/xen.h @@ -705,6 +705,13 @@ typedef struct shared_info shared_info_t; * 8. There is guaranteed to be at least 512kB padding after the final * bootstrap element. If necessary, the bootstrap virtual region is * extended by an extra 4MB to ensure this. + * + * Note: Prior to 7a9d7646307b7c872b8dbd7546579acd3b54223d ("x86/32-on-64: + * adjust Dom0 initial page table layout") the 3.e) contained two different + * values with a 64-bit hypervisor and a 32-bit initial domain kernel. The + * pt_base pointed to the L4 (setup by the hypervisor and not used by + * the guest) and the %cr3 pointed to the L3. This meant an difference of + * one page. */ #define MAX_GUEST_CMDLINE 1024 -- 1.7.11.7