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Revert "xen/balloon: Fix crash when ballooning on x86 32 bit PAE"

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This reverts commit dfd74a1edf.

This has been fixed by commit dca4436d1c which added the out
of bounds check to __add_memory, so that trying to add blocks past
MAX_PHYSMEM_BITS will fail.

Note the check in the Xen balloon driver was bogus anyway, as it
checked the start address of the resource, but it should instead test
the end address to assert the whole resource falls below
MAX_PHYSMEM_BITS.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20200727091342.52325-4-roger.pau@citrix.com
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Roger Pau Monne 2020-07-27 11:13:41 +02:00 committed by Juergen Gross
parent 88a479ff6e
commit f5ec672326
1 changed files with 0 additions and 14 deletions
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14
drivers/xen/balloon.c
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@ -266,20 +266,6 @@ static struct resource *additional_memory_resource(phys_addr_t size)
return NULL;
}
#ifdef CONFIG_SPARSEMEM
{
unsigned long limit = 1UL << (MAX_PHYSMEM_BITS - PAGE_SHIFT);
unsigned long pfn = res->start >> PAGE_SHIFT;
if (pfn > limit) {
pr_err("New System RAM resource outside addressable RAM (%lu > %lu)\n",
pfn, limit);
release_memory_resource(res);
return NULL;
}
}
#endif
return res;
}