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Re: [Qemu-devel] [RFC v7 05/16] softmmu: Add new TLB_EXCL flag
From: |
Alex Bennée |
Subject: |
Re: [Qemu-devel] [RFC v7 05/16] softmmu: Add new TLB_EXCL flag |
Date: |
Thu, 11 Feb 2016 13:18:57 +0000 |
User-agent: |
mu4e 0.9.17; emacs 25.0.90.5 |
Alvise Rigo <address@hidden> writes:
> Add a new TLB flag to force all the accesses made to a page to follow
> the slow-path.
>
> The TLB entries referring guest pages with the DIRTY_MEMORY_EXCLUSIVE
> bit clean will have this flag set.
>
> Suggested-by: Jani Kokkonen <address@hidden>
> Suggested-by: Claudio Fontana <address@hidden>
> Signed-off-by: Alvise Rigo <address@hidden>
> ---
> include/exec/cpu-all.h | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
> index 83b1781..f8d8feb 100644
> --- a/include/exec/cpu-all.h
> +++ b/include/exec/cpu-all.h
> @@ -277,6 +277,14 @@ CPUArchState *cpu_copy(CPUArchState *env);
> #define TLB_NOTDIRTY (1 << 4)
> /* Set if TLB entry is an IO callback. */
> #define TLB_MMIO (1 << 5)
> +/* Set if TLB entry references a page that requires exclusive access. */
> +#define TLB_EXCL (1 << 6)
> +
> +/* Do not allow a TARGET_PAGE_MASK which covers one or more bits defined
> + * above. */
> +#if TLB_EXCL >= TARGET_PAGE_SIZE
> +#error TARGET_PAGE_MASK covering the low bits of the TLB virtual address
> +#endif
>
> void dump_exec_info(FILE *f, fprintf_function cpu_fprintf);
> void dump_opcount_info(FILE *f, fprintf_function cpu_fprintf);
Reviewed-by: Alex Bennée <address@hidden>
--
Alex Bennée
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