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Re: [Xen-devel] [PATCH v8 3/5] xen/mem_sharing: VM forking
- To: Tamas K Lengyel <tamas.lengyel@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 21 Feb 2020 14:02:01 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 21 Feb 2020 14:02:31 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 21/02/2020 13:43, Andrew Cooper wrote:
> On 10/02/2020 19:21, Tamas K Lengyel wrote:
>> diff --git a/xen/arch/x86/mm/mem_sharing.c b/xen/arch/x86/mm/mem_sharing.c
>> index 3835bc928f..ccf338918d 100644
>> --- a/xen/arch/x86/mm/mem_sharing.c
>> +++ b/xen/arch/x86/mm/mem_sharing.c
>> @@ -36,6 +37,9 @@
>> #include <asm/altp2m.h>
>> #include <asm/atomic.h>
>> #include <asm/event.h>
>> +#include <asm/hap.h>
>> +#include <asm/hvm/hvm.h>
>> +#include <asm/hvm/save.h>
> This include is stale, I think.
>
>> +static void fork_tsc(struct domain *cd, struct domain *d)
>> +{
>> + uint32_t tsc_mode;
>> + uint32_t gtsc_khz;
>> + uint32_t incarnation;
>> + uint64_t elapsed_nsec;
>> +
>> + tsc_get_info(d, &tsc_mode, &elapsed_nsec, >sc_khz, &incarnation);
>> + tsc_set_info(cd, tsc_mode, elapsed_nsec, gtsc_khz, incarnation);
> Sadly, get and set are asymetric. For reasons best understood by the
> original authors, incarnation gets automatically incremented on set,
> rather than happing as part of migration where it logically lives.
>
> As a result, you probably want to set incarnation - 1, and leave a
> comment saying "Don't bump the incarnation" or similar.
P.S. Can both be fixed on commit if you agree. Seems pointless sending
a v9 just for these two.
~Andrew
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