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Re: [PATCH] target/s390x: fix s390_probe_access to check PAGE_WRITE_ORG


From: Richard Henderson
Subject: Re: [PATCH] target/s390x: fix s390_probe_access to check PAGE_WRITE_ORG for writeability
Date: Thu, 22 Apr 2021 09:10:55 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1

On 4/22/21 8:44 AM, Alex Bennée wrote:
We can remove PAGE_WRITE when (internally) marking a page read-only
because it contains translated code. This can get confused when we are
executing signal return code on signal stacks.

Fixes: e56552cf07 ("target/s390x: Implement the MVPG condition-code-option bit")
Found-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: Cornelia Huck <cohuck@redhat.com>
Cc: Thomas Huth <thuth@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Laurent Vivier <laurent@vivier.eu>
---
  target/s390x/mem_helper.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~



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