Re: [Qemu-devel] Tracing guest virtual addresses

[Peter Maydell]

On 26 June 2017 at 10:26, Lluís Vilanova <address@hidden> wrote:
> There's two places where memory access tracing is triggered:
>
> * tcg_gen_qemu_ld/st_...
> * ld/st templates (both softmmu and user)
>
> AFAIK, helpers use the ld/st templates to access guest memory.

Mostly, but there are one or two special cases, for instance
the ARM HELPER(dc_zva) in target/arm/helper.c, which has a
fastpath that uses tlb_vaddr_to_host to look up the host memory
address and then memset to do the clear-to-zeroes operation.

thanks
-- PMM