From: Richard Henderson <richard.henderson@linaro.org>
To: "Ilya Leoshkevich" <iii@linux.ibm.com>,
"Laurent Vivier" <laurent@vivier.eu>,
"Eduardo Habkost" <eduardo@habkost.net>,
"Marcel Apfelbaum" <marcel.apfelbaum@gmail.com>,
"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
"Yanan Wang" <wangyanan55@huawei.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"David Hildenbrand" <david@redhat.com>,
"Peter Maydell" <peter.maydell@linaro.org>
Cc: qemu-devel@nongnu.org, qemu-s390x@nongnu.org,
Christian Borntraeger <borntraeger@linux.ibm.com>
Subject: Re: [PATCH v4 4/5] target/i386: Make translator stop before the end of a page
Date: Thu, 11 Aug 2022 09:58:52 -0700 [thread overview]
Message-ID: <9d15064f-3580-49a8-596b-019663b084fb@linaro.org> (raw)
In-Reply-To: <20220811095534.241224-5-iii@linux.ibm.com>
On 8/11/22 02:55, Ilya Leoshkevich wrote:
> Right now translator stops right *after* the end of a page, which
> breaks reporting of fault locations when the last instruction of a
> multi-insn translation block crosses a page boundary.
>
> An implementation, like the one arm and s390x have, would require an
> i386 length disassembler, which is burdensome to maintain. Another
> alternative would be to single-step at the end of a guest page, but
> this may come with a performance impact.
>
> Fix by snapshotting disassembly state and restoring it after we figured
> out we crossed a page boundary. This includes rolling back cc_op
> updates and emitted ops.
>
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
> ---
> target/i386/tcg/translate.c | 25 ++++++++++++++++++++++++-
> 1 file changed, 24 insertions(+), 1 deletion(-)
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
r~
next prev parent reply other threads:[~2022-08-11 17:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-11 9:55 [PATCH v4 0/5] linux-user: Fix siginfo_t contents when jumping to non-readable pages Ilya Leoshkevich
2022-08-11 9:55 ` [PATCH v4 1/5] accel/tcg: Invalidate translations when clearing PAGE_EXEC Ilya Leoshkevich
2022-08-11 9:55 ` [PATCH v4 2/5] accel/tcg: Introduce is_same_page() Ilya Leoshkevich
2022-08-11 16:59 ` Richard Henderson
2022-08-11 9:55 ` [PATCH v4 3/5] target/s390x: Make translator stop before the end of a page Ilya Leoshkevich
2022-08-11 16:59 ` Richard Henderson
2022-08-11 9:55 ` [PATCH v4 4/5] target/i386: " Ilya Leoshkevich
2022-08-11 16:58 ` Richard Henderson [this message]
2022-08-11 17:22 ` Richard Henderson
2022-08-11 9:55 ` [PATCH v4 5/5] tests/tcg: Test siginfo_t contents when jumping to non-readable pages Ilya Leoshkevich
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