subject:"\[Xen\-devel\] \[PATCH\] x86\/boot\: Disable IBRS in intr\/nmi exit path at bootup stage"

Re: [Xen-devel] [PATCH] x86/boot: Disable IBRS in intr/nmi exit path at bootup stage

2018-03-26 Thread Zhenzhong Duan

在 2018/3/26 21:39, Jan Beulich 写道: On 21.03.18 at 03:58, wrote: After reset, IBRS is disabled by processor, but a coming intr/nmi leave IBRS enabled after their exit. It's not necessory for bootup code to run in low performance with IBRS enabled. On ORACLE

Re: [Xen-devel] [PATCH] x86/boot: Disable IBRS in intr/nmi exit path at bootup stage

2018-03-26 Thread Jan Beulich

>>> On 21.03.18 at 03:58, wrote: > After reset, IBRS is disabled by processor, but a coming intr/nmi leave IBRS > enabled after their exit. It's not necessory for bootup code to run in low > performance with IBRS enabled. > > On ORACLE X6-2(500GB/88 cpus, dom0 11GB/20

[Xen-devel] [PATCH] x86/boot: Disable IBRS in intr/nmi exit path at bootup stage

2018-03-20 Thread Zhenzhong Duan

After reset, IBRS is disabled by processor, but a coming intr/nmi leave IBRS enabled after their exit. It's not necessory for bootup code to run in low performance with IBRS enabled. On ORACLE X6-2(500GB/88 cpus, dom0 11GB/20 vcpus), we observed an 200s+ delay in construct_dom0. By initializing