diff options
| author | Emilio G. Cota <cota@braap.org> | 2017-11-13 13:55:27 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2017-11-13 13:55:27 +0000 |
| commit | 7264961934130df50d151def5eb415efa2e28ec5 (patch) | |
| tree | 7e2e4c7036a2a2e20a083ee83169413d68af12f7 /vl.c | |
| parent | 1342b0355ed943ca4ad4e67e03390b69476b8a6b (diff) | |
hw: add .min_cpus and .default_cpus fields to machine_class
max_cpus needs to be an upper bound on the number of vCPUs
initialized; otherwise TCG region initialization breaks.
Some boards initialize a hard-coded number of vCPUs, which is not
captured by the global max_cpus and therefore breaks TCG initialization.
Fix it by adding the .min_cpus field to machine_class.
This commit also changes some user-facing behaviour: we now die if
-smp is below this hard-coded vCPU minimum instead of silently
ignoring the passed -smp value (sometimes announcing this by printing
a warning). However, the introduction of .default_cpus lessens the
likelihood that users will notice this: if -smp isn't set, we now
assign the value in .default_cpus to both smp_cpus and max_cpus. IOW,
if a user does not set -smp, they always get a correct number of vCPUs.
This change fixes 3468b59 ("tcg: enable multiple TCG contexts in
softmmu", 2017-10-24), which broke TCG initialization for some
ARM boards.
Fixes: 3468b59e18b179bc63c7ce934de912dfa9596122
Reported-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-id: 1510343626-25861-6-git-send-email-cota@braap.org
Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'vl.c')
| -rw-r--r-- | vl.c | 21 |
1 files changed, 18 insertions, 3 deletions
@@ -160,8 +160,8 @@ Chardev *virtcon_hds[MAX_VIRTIO_CONSOLES]; Chardev *sclp_hds[MAX_SCLP_CONSOLES]; int win2k_install_hack = 0; int singlestep = 0; -int smp_cpus = 1; -unsigned int max_cpus = 1; +int smp_cpus; +unsigned int max_cpus; int smp_cores = 1; int smp_threads = 1; int acpi_enabled = 1; @@ -4327,9 +4327,24 @@ int main(int argc, char **argv, char **envp) exit(0); } + /* machine_class: default to UP */ + machine_class->max_cpus = machine_class->max_cpus ?: 1; + machine_class->min_cpus = machine_class->min_cpus ?: 1; + machine_class->default_cpus = machine_class->default_cpus ?: 1; + + /* default to machine_class->default_cpus */ + smp_cpus = machine_class->default_cpus; + max_cpus = machine_class->default_cpus; + smp_parse(qemu_opts_find(qemu_find_opts("smp-opts"), NULL)); - machine_class->max_cpus = machine_class->max_cpus ?: 1; /* Default to UP */ + /* sanity-check smp_cpus and max_cpus against machine_class */ + if (smp_cpus < machine_class->min_cpus) { + error_report("Invalid SMP CPUs %d. The min CPUs " + "supported by machine '%s' is %d", smp_cpus, + machine_class->name, machine_class->min_cpus); + exit(1); + } if (max_cpus > machine_class->max_cpus) { error_report("Invalid SMP CPUs %d. The max CPUs " "supported by machine '%s' is %d", max_cpus, |