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kvm: ppc: warn user on PAGE_SIZE mismatch

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On PPC, the default PAGE_SIZE is 64kb. Unfortunately, the hardware
alignments don't match here: There are RAM and MMIO regions within
a single page when it's 64kb in size.

So the only way out for now is to tell the user that he should use 4k
PAGE_SIZE.

This patch gives the user a hint on that, telling him that failing to
register a prefix slot is most likely to be caused by mismatching PAGE_SIZE.

This way it's also more future-proof, as bigger PAGE_SIZE can easily be
supported by other machines then, as long as they stick to 64kb granularities.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2011-04-16 10:15:11 +02:00
parent 64e07be544
commit d4d6868f7b
1 changed files with 5 additions and 0 deletions
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5
kvm-all.c
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@ -603,6 +603,11 @@ static void kvm_set_phys_mem(target_phys_addr_t start_addr, ram_addr_t size,
if (err) { if (err) {
fprintf(stderr, "%s: error registering prefix slot: %s\n", fprintf(stderr, "%s: error registering prefix slot: %s\n",
__func__, strerror(-err)); __func__, strerror(-err));
#ifdef TARGET_PPC
fprintf(stderr, "%s: This is probably because your kernel's " \
"PAGE_SIZE is too big. Please try to use 4k " \
"PAGE_SIZE!\n", __func__);
#endif
abort(); abort();
} }
} }