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Re: [Qemu-devel] [PATCH] cputlb: cast size_t to target_ulong before usin
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [Qemu-devel] [PATCH] cputlb: cast size_t to target_ulong before using for address masks |
Date: |
Fri, 7 Jun 2019 01:08:01 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 |
On 6/6/19 5:43 PM, Alex Bennée wrote:
> While size_t is defined to happily access the biggest host object this
> isn't the case when generating masks for 64 bit guests on 32 bit
> hosts. Otherwise we end up truncating the address when we fall back to
> our unaligned helper.
>
> Cc: Andrew Randrianasulu <address@hidden>
Fixes: https://bugs.launchpad.net/qemu/+bug/1831545
> Signed-off-by: Alex Bennée <address@hidden>
> ---
> 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 b796ab1cbe..8f814a1a2c 100644
> --- a/accel/tcg/cputlb.c
> +++ b/accel/tcg/cputlb.c
> @@ -1306,7 +1306,7 @@ load_helper(CPUArchState *env, target_ulong addr,
> TCGMemOpIdx oi,
> uint64_t r1, r2;
> unsigned shift;
> do_unaligned_access:
> - addr1 = addr & ~(size - 1);
> + addr1 = addr & ~((target_ulong)size - 1);
Tricky...
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
> addr2 = addr1 + size;
> r1 = full_load(env, addr1, oi, retaddr);
> r2 = full_load(env, addr2, oi, retaddr);
>