[v1] accel/tcg: Improve disassembly for target and plugin

[PATCH 05/32] accel/tcg: Cap the translation block when we encounter mmio

Richard Henderson posted 32 patches 1 year, 10 months ago

Diff against v2
Download mbox

Maintainers: Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, "Alex Bennée" <alex.bennee@linaro.org>, Alexandre Iooss <erdnaxe@crans.org>, Mahmoud Mandour <ma.mandourr@gmail.com>, Pierrick Bouvier <pierrick.bouvier@linaro.org>, Peter Maydell <peter.maydell@linaro.org>, Michael Rolnik <mrolnik@gmail.com>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, Brian Cain <bcain@quicinc.com>, Eduardo Habkost <eduardo@habkost.net>, Song Gao <gaosong@loongson.cn>, Laurent Vivier <laurent@vivier.eu>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Aurelien Jarno <aurelien@aurel32.net>, Jiaxun Yang <jiaxun.yang@flygoat.com>, Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>, Chris Wulff <crwulff@gmail.com>, Marek Vasut <marex@denx.de>, Stafford Horne <shorne@gmail.com>, Nicholas Piggin <npiggin@gmail.com>, Daniel Henrique Barboza <danielhb413@gmail.com>, Palmer Dabbelt <palmer@dabbelt.com>, Alistair Francis <alistair.francis@wdc.com>, Bin Meng <bin.meng@windriver.com>, Weiwei Li <liwei1518@gmail.com>, Liu Zhiwei <zhiwei_liu@linux.alibaba.com>, Yoshinori Sato <ysato@users.sourceforge.jp>, David Hildenbrand <david@redhat.com>, Ilya Leoshkevich <iii@linux.ibm.com>, Thomas Huth <thuth@redhat.com>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, Artyom Tarasenko <atar4qemu@gmail.com>, Bastian Koppelmann <kbastian@mail.uni-paderborn.de>, Max Filippov <jcmvbkbc@gmail.com>

There is a newer version of this series

Expand all Fold all

[PATCH 05/32] accel/tcg: Cap the translation block when we encounter mmio

Posted by Richard Henderson 1 year, 10 months ago

Do not allow translation to proceed beyond one insn with mmio,
as we will not be caching the TranslationBlock.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 accel/tcg/translator.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/accel/tcg/translator.c b/accel/tcg/translator.c
index 42beb1c9b7..438b6d4cba 100644
--- a/accel/tcg/translator.c
+++ b/accel/tcg/translator.c
@@ -236,6 +236,8 @@ static bool translator_ld(CPUArchState *env, DisasContextBase *db,
 
     /* Use slow path if first page is MMIO. */
     if (unlikely(tb_page_addr0(tb) == -1)) {
+        /* We capped translation with first page MMIO in tb_gen_code. */
+        tcg_debug_assert(db->max_insns == 1);
         return false;
     }
 
@@ -284,6 +286,8 @@ static bool translator_ld(CPUArchState *env, DisasContextBase *db,
         if (unlikely(new_page1 == -1)) {
             tb_unlock_pages(tb);
             tb_set_page_addr0(tb, -1);
+            /* Require that this be the final insn. */
+            db->max_insns = db->num_insns;
             return false;
         }
 
-- 
2.34.1

Re: [PATCH 05/32] accel/tcg: Cap the translation block when we encounter mmio

Posted by Philippe Mathieu-Daudé 1 year, 10 months ago

On 5/4/24 12:24, Richard Henderson wrote:
> Do not allow translation to proceed beyond one insn with mmio,
> as we will not be caching the TranslationBlock.
> 
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>   accel/tcg/translator.c | 4 ++++
>   1 file changed, 4 insertions(+)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>