Re: [PATCH v15 1/3] mem_sharing: don't reset vCPU info page during fork reset

2020-04-20 Thread Tamas K Lengyel
On Mon, Apr 20, 2020 at 10:09 AM Tamas K Lengyel wrote: > > On Mon, Apr 20, 2020 at 9:51 AM Jan Beulich wrote: > > > > On 20.04.2020 16:27, Tamas K Lengyel wrote: > > > On Mon, Apr 20, 2020 at 8:19 AM Jan Beulich wrote: > > >> > > >> On 20.04.2020 16:15, Tamas K Lengyel wrote: > > >>> On Mon, Ap

Re: [PATCH v15 1/3] mem_sharing: don't reset vCPU info page during fork reset

2020-04-20 Thread Tamas K Lengyel
On Mon, Apr 20, 2020 at 9:51 AM Jan Beulich wrote: > > On 20.04.2020 16:27, Tamas K Lengyel wrote: > > On Mon, Apr 20, 2020 at 8:19 AM Jan Beulich wrote: > >> > >> On 20.04.2020 16:15, Tamas K Lengyel wrote: > >>> On Mon, Apr 20, 2020 at 1:45 AM Roger Pau Monné > >>> wrote: > > On Fri

Re: [PATCH v15 1/3] mem_sharing: don't reset vCPU info page during fork reset

2020-04-20 Thread Jan Beulich
On 20.04.2020 16:27, Tamas K Lengyel wrote: > On Mon, Apr 20, 2020 at 8:19 AM Jan Beulich wrote: >> >> On 20.04.2020 16:15, Tamas K Lengyel wrote: >>> On Mon, Apr 20, 2020 at 1:45 AM Roger Pau Monné >>> wrote: On Fri, Apr 17, 2020 at 10:06:31AM -0700, Tamas K Lengyel wrote: > When

Re: [PATCH v15 1/3] mem_sharing: don't reset vCPU info page during fork reset

2020-04-20 Thread Tamas K Lengyel
On Mon, Apr 20, 2020 at 8:19 AM Jan Beulich wrote: > > On 20.04.2020 16:15, Tamas K Lengyel wrote: > > On Mon, Apr 20, 2020 at 1:45 AM Roger Pau Monné > > wrote: > >> > >> On Fri, Apr 17, 2020 at 10:06:31AM -0700, Tamas K Lengyel wrote: > >>> When a forked VM is being reset while having vm_event

Re: [PATCH v15 1/3] mem_sharing: don't reset vCPU info page during fork reset

2020-04-20 Thread Jan Beulich
On 20.04.2020 16:15, Tamas K Lengyel wrote: > On Mon, Apr 20, 2020 at 1:45 AM Roger Pau Monné wrote: >> >> On Fri, Apr 17, 2020 at 10:06:31AM -0700, Tamas K Lengyel wrote: >>> When a forked VM is being reset while having vm_events active, re-copying >>> the >>> vCPU info page can lead to events b

Re: [PATCH v15 1/3] mem_sharing: don't reset vCPU info page during fork reset

2020-04-20 Thread Tamas K Lengyel
On Mon, Apr 20, 2020 at 1:45 AM Roger Pau Monné wrote: > > On Fri, Apr 17, 2020 at 10:06:31AM -0700, Tamas K Lengyel wrote: > > When a forked VM is being reset while having vm_events active, re-copying > > the > > vCPU info page can lead to events being lost. This seems to only affect a > > subse

Re: [PATCH v15 1/3] mem_sharing: don't reset vCPU info page during fork reset

2020-04-20 Thread Roger Pau Monné
On Fri, Apr 17, 2020 at 10:06:31AM -0700, Tamas K Lengyel wrote: > When a forked VM is being reset while having vm_events active, re-copying the > vCPU info page can lead to events being lost. This seems to only affect a > subset of events (interrupts), while not others (cpuid, MTF, EPT) thus it wa

[PATCH v15 1/3] mem_sharing: don't reset vCPU info page during fork reset

2020-04-17 Thread Tamas K Lengyel
When a forked VM is being reset while having vm_events active, re-copying the vCPU info page can lead to events being lost. This seems to only affect a subset of events (interrupts), while not others (cpuid, MTF, EPT) thus it was not discovered beforehand. Only copying vCPU info page contents durin