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Re: [Xen-devel] [RFC PATCH 0/5] x86: Multiple fixes to MSR_TSC_AUX and RDTSCP handling for guests
On 03/09/2018 01:41 PM, Andrew Cooper wrote:
On 09/03/2018 18:05, Boris Ostrovsky wrote:
On 02/26/2018 06:30 PM, Andrew Cooper wrote:
On 26/02/2018 19:44, Boris Ostrovsky wrote:
On 02/26/2018 02:12 PM, Andrew Cooper wrote:
On 20/02/18 11:58, Andrew Cooper wrote:
This rats nest was discovered when finding that MSR_TSC_AUX leaked
into PV
guests. It is RFC because I haven't done extensive testing on the
result, and
because there are some functional changes for the virtualised TSC
modes.
Andrew Cooper (5):
x86/hvm: Don't shadow the domain parameter in hvm_save_cpu_msrs()
x86/pv: Avoid leaking other guests' MSR_TSC_AUX values into PV
context
x86/time: Rework pv_soft_rdtsc() to aid further cleanup
x86/pv: Remove deferred RDTSC{,P} handling in
pv_emulate_privileged_op()
x86: Rework MSR_TSC_AUX handling from scratch.
Konrad/Boris: Can we have any input WRT TSC_MODE_PVRDTSCP usage? Are
you still using the feature, or is it abandoned?
I already asked a few internal teams about, haven't heard back.
Ah ok - thanks. I'll wait to hear back from you then.
Took longer than I hoped, sorry.
Couldn't find anyone who is still using this mode (or perhaps noone
wanted to admit to this ;-)).
Is this your (Oracle's) blessing to purge the feature and pretend that
it never existed?
Not sure about the second part but for the first part (purging) --- sure.
-boris
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