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openSUSE:Step:15-SP1
xen.14764
5e21ce98-x86-time-update-TSC-stamp-after-deep-C...
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File 5e21ce98-x86-time-update-TSC-stamp-after-deep-C-state.patch of Package xen.14764
# Commit bbf283f853f8c0e4d29248dd44d3b0e0abc07629 # Date 2020-01-17 16:11:20 +0100 # Author Igor Druzhinin <igor.druzhinin@citrix.com> # Committer Jan Beulich <jbeulich@suse.com> x86/time: update TSC stamp on restore from deep C-state If ITSC is not available on CPU (e.g if running nested as PV shim) then X86_FEATURE_NONSTOP_TSC is not advertised in certain cases, i.e. all AMD and some old Intel processors. In which case TSC would need to be restored on CPU from platform time by Xen upon exiting C-states. As platform time might be behind the last TSC stamp recorded for the current CPU, invariant of TSC stamp being always behind local TSC counter is violated. This has an effect of get_s_time() going negative resulting in eventual system hang or crash. Fix this issue by updating local TSC stamp along with TSC counter write. Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com> Acked-by: Jan Beulich <jbeulich@suse.com> --- a/xen/arch/x86/time.c +++ b/xen/arch/x86/time.c @@ -857,10 +857,16 @@ u64 stime2tsc(s_time_t stime) void cstate_restore_tsc(void) { + struct cpu_time *t = &this_cpu(cpu_time); + if ( boot_cpu_has(X86_FEATURE_NONSTOP_TSC) ) return; - write_tsc(stime2tsc(read_platform_stime(NULL))); + t->stamp.master_stime = read_platform_stime(NULL); + t->stamp.local_tsc = stime2tsc(t->stamp.master_stime); + t->stamp.local_stime = t->stamp.master_stime; + + write_tsc(t->stamp.local_tsc); } /***************************************************************************
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