[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 7/8] docs: Document start_info changes in Xen 4.2.
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 <konrad.wilk@xxxxxxxxxx> --- 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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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