| |
|
 |
|
 |
|
|
|
| |
|
|
xen-devel
Re: [Xen-devel] System Calls in x86_32
>The reason why Xen wants to intercept the
>interrupts is that we could be executing 32bit guest, or an HVM guest
>etc (look through the definition of int80_direct_trap for details).
Not exactly. First of all, HVM guests are don't-care here - they handle
int 0x80 with their own IDT. 64-bit guests must go through Xen because
guest and kernel run in ring 3, and the kernel mode flag must be set
correctly, which can only be donein Xen. 32-bit guest must go through
Xen because x84-64 doesn't know 32-bit gates (i.e. the target code
selector of any gate must be a 64-bit code segment).
Jan
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
|
|
| |
|
Home