That is of course completely dependent on the target page size. So,
yes, a target with a very small page size cannot use large alignments.
The assert makes sure.
Is this comment simply by inspection, or did you have an actual bug to
report?
** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1868527
Title:
alignment may overlap the TLB flags
Status in QEMU:
Incomplete
Bug description:
Hi,
In QEMU-4.2.0, or git-9b26a610936deaf436af9b7e39e4b7f0a35e4409, alignment may
overlap the TLB flags.
For example, the alignment: MO_ALIGN_32,
MO_ALIGN_32 = 5 << MO_ASHIFT,
and the TLB flag: TLB_DISCARD_WRITE
#define TLB_DISCARD_WRITE (1 << (TARGET_PAGE_BITS_MIN - 6))
then, in the function "get_alignment_bits", the assert may fail:
#if defined(CONFIG_SOFTMMU)
/* The requested alignment cannot overlap the TLB flags. */
tcg_debug_assert((TLB_FLAGS_MASK & ((1 << a) - 1)) == 0);
#endif
However, the alignment of MO_ALIGN_32 is not used for now, so the
assert cannot be triggered in current version. Anyway it seems like a
potential conflict.
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