RE: [Xen-devel] [PATCH] small adjustment to asm constraints forc/s19400

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>>> "Lu, Guanqun" <guanqun.lu@xxxxxxxxx> 31.03.09 10:54 >>>
>[before] (XEN)  EFER: d01<0> STAR: e023e00800000000<0> LSTAR: 
>ffff828c8029b000<0> CSTAR: ffff828c8029b080<0>
>SYSCALL_MASK: 34700<0> FS_BASE: 0<0> GS_BASE: b7f4a6c0<0> SH_GS_BASE: 0
>[after] (XEN)  EFER: d01<0> STAR: e023e00800000000<0> LSTAR: 
>ffff828c8029b000<0> CSTAR: ffff828c8029b080<0>
>SYSCALL_MASK: 34700<0> FS_BASE: 0<0> GS_BASE: b7f4a6c0<0> SH_GS_BASE: 0
> 
>They're the same.
>
>And aslo I dump GDT, IDT, LDT and TR register and tss struct, there are no 
>difference seen.
>
>
>So can you give some advice some more registers should be dumped?

Assuming this is an Intel box, the guest is certainly using sysenter (which the 
user mode EIP saved on the stack would also suggest), so you're really after 
the three SYSENTER MSRs. And indeed - restore_rest_processor_state() seems to 
only care for the STAR ones.

Jan


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