From 1d3e745f7ada921d544f29fbf84c6f0f63025e61 Mon Sep 17 00:00:00 2001 From: Alex Bennée Date: Tue, 4 Mar 2025 22:24:35 +0000 Subject: plugins/api: split out time control helpers MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit These are only usable in system mode where we control the timer. For user-mode make them NOPs. Reviewed-by: Richard Henderson Signed-off-by: Alex Bennée Message-Id: <20250304222439.2035603-29-alex.bennee@linaro.org> --- plugins/api-system.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) (limited to 'plugins/api-system.c') diff --git a/plugins/api-system.c b/plugins/api-system.c index 38560de342..cc190b167e 100644 --- a/plugins/api-system.c +++ b/plugins/api-system.c @@ -95,3 +95,37 @@ const char *qemu_plugin_hwaddr_device_name(const struct qemu_plugin_hwaddr *h) return g_intern_static_string("RAM"); } } + +/* + * Time control + */ +static bool has_control; +static Error *migration_blocker; + +const void *qemu_plugin_request_time_control(void) +{ + if (!has_control) { + has_control = true; + error_setg(&migration_blocker, + "TCG plugin time control does not support migration"); + migrate_add_blocker(&migration_blocker, NULL); + return &has_control; + } + return NULL; +} + +static void advance_virtual_time__async(CPUState *cpu, run_on_cpu_data data) +{ + int64_t new_time = data.host_ulong; + qemu_clock_advance_virtual_time(new_time); +} + +void qemu_plugin_update_ns(const void *handle, int64_t new_time) +{ + if (handle == &has_control) { + /* Need to execute out of cpu_exec, so bql can be locked. */ + async_run_on_cpu(current_cpu, + advance_virtual_time__async, + RUN_ON_CPU_HOST_ULONG(new_time)); + } +} -- cgit 1.4.1