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| author | Alex Bennée | 2020-02-28 20:24:14 +0100 |
|---|---|---|
| committer | Richard Henderson | 2020-02-29 02:43:25 +0100 |
| commit | 21f2f447ad28d099d3ac5adc8ffe8eeaa56604f4 (patch) | |
| tree | f2322bc547bac30470d8c335fa7f9b1f4314805f | |
| parent | accel/tcg: remove link between guest ram and TCG cache size (diff) | |
| download | qemu-21f2f447ad28d099d3ac5adc8ffe8eeaa56604f4.tar.gz qemu-21f2f447ad28d099d3ac5adc8ffe8eeaa56604f4.tar.xz qemu-21f2f447ad28d099d3ac5adc8ffe8eeaa56604f4.zip | |
accel/tcg: only USE_STATIC_CODE_GEN_BUFFER on 32 bit hosts
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>
| -rw-r--r-- | accel/tcg/translate-all.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c index 5b66af783b..4ce5d1b393 100644 --- a/accel/tcg/translate-all.c +++ b/accel/tcg/translate-all.c @@ -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 |