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accel/tcg: only USE_STATIC_CODE_GEN_BUFFER on 32 bit hosts

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There is no particular reason to use a static codegen buffer on 64 bit
hosts as we have address space to burn. Allow the common CONFIG_USER
case to use the mmap'ed buffers like SoftMMU.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Niek Linnenbank <nieklinnenbank@gmail.com>
Message-Id: <20200228192415.19867-4-alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Alex Bennée 2020-02-28 19:24:14 +00:00 committed by Richard Henderson
parent 47a2def453
commit 21f2f447ad
1 changed files with 6 additions and 5 deletions
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11
accel/tcg/translate-all.c
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@ -892,11 +892,12 @@ static void page_lock_pair(PageDesc **ret_p1, tb_page_addr_t phys1,
}
}
#if defined(CONFIG_USER_ONLY)
/* Currently it is not recommended to allocate big chunks of data in
user mode. It will change when a dedicated libc will be used. */
/* ??? 64-bit hosts ought to have no problem mmaping data outside the
region in which the guest needs to run. Revisit this. */
#if defined(CONFIG_USER_ONLY) && TCG_TARGET_REG_BITS == 32
/*
* For user mode on smaller 32 bit systems we may run into trouble
* allocating big chunks of data in the right place. On these systems
* we utilise a static code generation buffer directly in the binary.
*/
#define USE_STATIC_CODE_GEN_BUFFER
#endif