This series fixes an issue where the outcome of the migration qtest
relies on the initial memory contents all being the same across the
first 100MiB of RAM, which is a very fragile invariant.

We fix this by making sure we zero the first byte of every testable page
in range beforehand.

Daniil Tatianin (2):
  i386/a-b-bootblock: factor test memory addresses out into constants
  i386/a-b-bootblock: zero the first byte of each page on start

 tests/migration/i386/a-b-bootblock.S | 18 +++++++++++++++---
 tests/migration/i386/a-b-bootblock.h | 16 ++++++++--------
 2 files changed, 23 insertions(+), 11 deletions(-)

-- 
2.34.1

On Thu, Sep 07, 2023 at 10:30:49PM +0300, Daniil Tatianin wrote:
> This series fixes an issue where the outcome of the migration qtest
> relies on the initial memory contents all being the same across the
> first 100MiB of RAM, which is a very fragile invariant.
> 
> We fix this by making sure we zero the first byte of every testable page
> in range beforehand.
> 
> Daniil Tatianin (2):
>   i386/a-b-bootblock: factor test memory addresses out into constants
>   i386/a-b-bootblock: zero the first byte of each page on start

Thanks, sorry for being slow on review.

Reviewed-by: Peter Xu <peterx@redhat.com>

How about other archs (arm/s390)?   It seems to me arm is all fine, but not
sure about s390.

-- 
Peter Xu