On Thu, 2018-12-13 at 21:01 -0600, Richard Henderson wrote:
> On 12/13/18 5:58 PM, Benjamin Herrenschmidt wrote:
> > +#ifdef CONFIG_ATOMIC64
> > +/* This is meant to be used for atomic PTE updates under MT-TCG */
> > +uint32_t glue(address_space_cmpxchgq_notdirty, SUFFIX)(ARG1_DECL,
> > +
On 12/13/18 5:58 PM, Benjamin Herrenschmidt wrote:
> +#ifdef CONFIG_ATOMIC64
> +/* This is meant to be used for atomic PTE updates under MT-TCG */
> +uint32_t glue(address_space_cmpxchgq_notdirty, SUFFIX)(ARG1_DECL,
> +hwaddr addr, uint64_t old, uint64_t new, MemTxAttrs attrs, MemTxResult
>
On some architectures, PTE updates for dirty and changed bits need
to be performed atomically. This adds a couple of address_space_cmpxchg*
helpers for that purpose.
Signed-off-by: Benjamin Herrenschmidt
---
include/exec/memory_ldst.inc.h | 6 +++
memory_ldst.inc.c | 78
