diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2024-02-15 11:30:44 +0000 |
|---|---|---|
| committer | Michael Tokarev <mjt@tls.msk.ru> | 2024-02-16 14:00:19 +0300 |
| commit | bbeeed7102c9c20565a0bcab8175b0ed3a3327f1 (patch) | |
| tree | 6a20e276893f6ae6a4905d72678850f9181c0bd3 /linux-user | |
| parent | 4971891b37520c389345531ca66f77eb8f89a1e6 (diff) | |
linux-user/aarch64: Choose SYNC as the preferred MTE mode
The API does not generate an error for setting ASYNC | SYNC; that merely
constrains the selection vs the per-cpu default. For qemu linux-user,
choose SYNC as the default.
Cc: qemu-stable@nongnu.org
Reported-by: Gustavo Romero <gustavo.romero@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Tested-by: Gustavo Romero <gustavo.romero@linaro.org>
Message-id: 20240207025210.8837-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
(cherry picked from commit 681dfc0d552963d4d598350d26097a692900b408)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Diffstat (limited to 'linux-user')
| -rw-r--r-- | linux-user/aarch64/target_prctl.h | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/linux-user/aarch64/target_prctl.h b/linux-user/aarch64/target_prctl.h index 907c314146..d9f6648e27 100644 --- a/linux-user/aarch64/target_prctl.h +++ b/linux-user/aarch64/target_prctl.h @@ -171,21 +171,26 @@ static abi_long do_prctl_set_tagged_addr_ctrl(CPUArchState *env, abi_long arg2) env->tagged_addr_enable = arg2 & PR_TAGGED_ADDR_ENABLE; if (cpu_isar_feature(aa64_mte, cpu)) { - switch (arg2 & PR_MTE_TCF_MASK) { - case PR_MTE_TCF_NONE: - case PR_MTE_TCF_SYNC: - case PR_MTE_TCF_ASYNC: - break; - default: - return -EINVAL; - } - /* * Write PR_MTE_TCF to SCTLR_EL1[TCF0]. - * Note that the syscall values are consistent with hw. + * + * The kernel has a per-cpu configuration for the sysadmin, + * /sys/devices/system/cpu/cpu<N>/mte_tcf_preferred, + * which qemu does not implement. + * + * Because there is no performance difference between the modes, and + * because SYNC is most useful for debugging MTE errors, choose SYNC + * as the preferred mode. With this preference, and the way the API + * uses only two bits, there is no way for the program to select + * ASYMM mode. */ - env->cp15.sctlr_el[1] = - deposit64(env->cp15.sctlr_el[1], 38, 2, arg2 >> PR_MTE_TCF_SHIFT); + unsigned tcf = 0; + if (arg2 & PR_MTE_TCF_SYNC) { + tcf = 1; + } else if (arg2 & PR_MTE_TCF_ASYNC) { + tcf = 2; + } + env->cp15.sctlr_el[1] = deposit64(env->cp15.sctlr_el[1], 38, 2, tcf); /* * Write PR_MTE_TAG to GCR_EL1[Exclude]. |