From: Richard Henderson <richard.henderson@linaro.org>
To: "Rémi Denis-Courmont" <remi@remlab.net>, qemu-arm@nongnu.org
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCHv2 1/3] target/arm: fix AArch64 virtual address space size
Date: Sun, 27 Jan 2019 10:47:44 -0800 [thread overview]
Message-ID: <670acf7b-d0ce-63a0-a4e4-94b95cbab099@linaro.org> (raw)
In-Reply-To: <20190126065211.3587-1-remi@remlab.net>
On 1/25/19 10:52 PM, Rémi Denis-Courmont wrote:
> From: Remi Denis-Courmont <remi.denis.courmont@huawei.com>
>
> Since QEMU does not support the ARMv8.2-LVA, Large Virtual Address,
> extension (yet), the VA address space is 48-bits plus a sign bit. User
> mode can only handle the positive half of the address space, so that
> makes a limit of 48 bits.
>
> (With LVA, it would be 53 and 52 bits respectively.)
>
> The incorrectly large address space conflicts with PAuth instructions,
> which bits 48-54 and 56-63 for the pointer authentication code. This
> also conflicts with (as yet unsupported by QEMU) data tagging and with
> the ARMv8.5-MTE extension.
>
> Signed-off-by: Remi Denis-Courmont <remi.denis.courmont@huawei.com>
> ---
> target/arm/cpu.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
r~
next prev parent reply other threads:[~2019-01-27 18:47 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-25 21:48 [Qemu-devel] [PATCH 0/3] target/arm: fix PAuth in user mode Rémi Denis-Courmont
2019-01-25 21:49 ` [Qemu-devel] [PATCH 1/3] target/arm: fix AArch64 virtual address space size Rémi Denis-Courmont
2019-01-25 23:29 ` Richard Henderson
2019-01-26 6:36 ` [Qemu-devel] [Qemu-arm] " Rémi Denis-Courmont
2019-01-26 6:46 ` Rémi Denis-Courmont
2019-01-26 20:00 ` Richard Henderson
2019-01-25 21:49 ` [Qemu-devel] [PATCH 2/3] target/arm: actually enable PAuth in user mode Rémi Denis-Courmont
2019-01-25 23:34 ` Richard Henderson
2019-01-25 21:49 ` [Qemu-devel] [PATCH 3/3] target/arm: fix decoding of B{,L}RA{A,B} Rémi Denis-Courmont
2019-01-25 23:40 ` [Qemu-devel] [PATCH 3/3] target/arm: fix decoding of B{, L}RA{A, B} Richard Henderson
2019-01-27 19:06 ` Richard Henderson
2019-01-26 6:52 ` [Qemu-devel] [PATCHv2 1/3] target/arm: fix AArch64 virtual address space size Rémi Denis-Courmont
2019-01-27 18:47 ` Richard Henderson [this message]
2019-01-26 6:52 ` [Qemu-devel] [PATCHv2 2/3] target/arm: actually enable PAuth in user mode Rémi Denis-Courmont
2019-01-27 18:48 ` Richard Henderson
2019-02-01 15:27 ` [Qemu-devel] [Qemu-arm] [PATCH 0/3] target/arm: fix " Peter Maydell
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