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List:       qemu-devel
Subject:    Re: [PATCH 2/3] target/hppa: mask offset bits in gva
From:       Helge Deller <deller () gmx ! de>
Date:       2024-03-24 16:24:33
Message-ID: e6fe525c-06b7-4cec-8a77-745cbfffee4a () gmx ! de
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On 3/24/24 09:09, Sven Schnelle wrote:
> The CPU seems to mask a few bits in the offset when running
> under HP-UX. ISR/IOR register contents for an address in
> the processor HPA (0xfffffffffffa0000) on my C8000 and J6750:
>
> running on Linux: 000000003fffffff c0000000fffa0500
> running on HP-UX: 00000000301fffff c0000000fffa0500
>
> I haven't found how this is switched (guess some diag in the
> firmware), but linux + seabios seems to handle that as well,
> so lets mask out the additional bits.
>
> Signed-off-by: Sven Schnelle <svens@stackframe.org>

I've seen the issue on HP-UX too, and can confirm the patch does
not break existing 32- and 64-bit Linux installations, so:

Tested-by: Helge Deller <deller@gmx.de>

Thanks!
Helge


> ---
>   target/hppa/cpu.h | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/target/hppa/cpu.h b/target/hppa/cpu.h
> index a072d0bb63..9bc4d208fa 100644
> --- a/target/hppa/cpu.h
> +++ b/target/hppa/cpu.h
> @@ -283,12 +283,13 @@ static inline int HPPA_BTLB_ENTRIES(CPUHPPAState *=
env)
>
>   void hppa_translate_init(void);
>
> +#define HPPA_GVA_OFFSET_MASK64 0x301fffffffffffff
>   #define CPU_RESOLVING_TYPE TYPE_HPPA_CPU
>
>   static inline uint64_t gva_offset_mask(target_ulong psw)
>   {
>       return (psw & PSW_W
> -            ? MAKE_64BIT_MASK(0, 62)
> +            ? HPPA_GVA_OFFSET_MASK64
>               : MAKE_64BIT_MASK(0, 32));
>   }
>


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