On 29.07.14 00:01, Scott Wood wrote:
On Fri, 2014-07-11 at 14:09 +0530, Bharat Bhushan wrote:
When userspace is debugging guest then MSR_DE is always set and
MSRP_DEP is set so that guest cannot change MSR_DE.
Guest debug resources are not yet emulated, So there seems no reason
we should stop guest controlling MSR_DE.
Also a followup patch will enable debug emulation and that requires
guest to control MSR_DE.
Why does it matter whether we emulate debug resources? We still don't
want the guest to be able to clear MSR[DE] and thus break host debug.
The patch description is misleading. This patch changes the default of
DEP to "guest controlled" when it boots up. Once QEMU wants control over
the debug registers, it gets switched to "QEMU controlled" (that code is
already there).
Alex
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