Re: [Qemu-devel] [RFC PATCH] cputlb: use uint64_t for interim values for unaligned load

[Igor Mammedov <imammedo@redhat.com>]

On Mon,  3 Jun 2019 16:01:20 +0100
Alex Bennée <alex.bennee@linaro.org> wrote:

> When running on 32 bit TCG backends a wide unaligned load ends up
> truncating data before returning to the guest. We specifically have
> the return type as uint64_t to avoid any premature truncation so we
> should use the same for the interim types.
> 
> Hopefully fixes #1830872
> 
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

Fixes arm/virt bios-tables-test for me, so

Tested-by: Igor Mammedov <imammedo@redhat.com>

> ---
>  accel/tcg/cputlb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c
> index cdcc3771020..b796ab1cbea 100644
> --- a/accel/tcg/cputlb.c
> +++ b/accel/tcg/cputlb.c
> @@ -1303,7 +1303,7 @@ load_helper(CPUArchState *env, target_ulong addr, TCGMemOpIdx oi,
>          && unlikely((addr & ~TARGET_PAGE_MASK) + size - 1
>                      >= TARGET_PAGE_SIZE)) {  
>          target_ulong addr1, addr2;
> -        tcg_target_ulong r1, r2;
> +        uint64_t r1, r2;
>          unsigned shift;
>      do_unaligned_access:
>          addr1 = addr & ~(size - 1);