x86/vPMU: do not clobber IA32_MISC_ENABLE
The VMX RDMSR intercept for MSR_IA32_MISC_ENABLE falls through into
vpmu_do_rdmsr(), so that core2_vpmu_do_rdmsr() may play with the PTS and PEBS
UNAVAIL bits.
Some 64bit Windows include IA32_MISC_ENABLE in the set of items checked by
PatchGuard, and will suffer a BSOD 0x109 CRITICAL_STRUCTURE_CORRUPTION if the
contents change on migrate.
The vPMU infrastructure should not clobber IA32_MISC_ENABLE at all.
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
projects / xen.git / commit