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sysemu: add set_virtual_time to accel ops

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We are about to remove direct calls to individual accelerators for
this information and will need a central point for plugins to hook
into time changes.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240530220610.1245424-2-pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240620152220.2192768-5-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2024-06-20 16:22:12 +01:00
parent ad59d5caee
commit 113ac1d212
5 changed files with 36 additions and 3 deletions
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18
include/sysemu/accel-ops.h
View file

@ -20,7 +20,12 @@
typedef struct AccelOpsClass AccelOpsClass;
DECLARE_CLASS_CHECKERS(AccelOpsClass, ACCEL_OPS, TYPE_ACCEL_OPS)
/* cpus.c operations interface */
/**
* struct AccelOpsClass - accelerator interfaces
*
* This structure is used to abstract accelerator differences from the
* core CPU code. Not all have to be implemented.
*/
struct AccelOpsClass {
/*< private >*/
ObjectClass parent_class;
@ -44,7 +49,18 @@ struct AccelOpsClass {
void (*handle_interrupt)(CPUState *cpu, int mask);
/**
* @get_virtual_clock: fetch virtual clock
* @set_virtual_clock: set virtual clock
*
* These allow the timer subsystem to defer to the accelerator to
* fetch time. The set function is needed if the accelerator wants
* to track the changes to time as the timer is warped through
* various timer events.
*/
int64_t (*get_virtual_clock)(void);
void (*set_virtual_clock)(int64_t time);
int64_t (*get_elapsed_ticks)(void);
/* gdbstub hooks */

3
include/sysemu/cpu-timers.h
View file

@ -96,8 +96,9 @@ int64_t cpu_get_clock(void);
void qemu_timer_notify_cb(void *opaque, QEMUClockType type);
/* get the VIRTUAL clock and VM elapsed ticks via the cpus accel interface */
/* get/set VIRTUAL clock and VM elapsed ticks via the cpus accel interface */
int64_t cpus_get_virtual_clock(void);
void cpus_set_virtual_clock(int64_t new_time);
int64_t cpus_get_elapsed_ticks(void);
#endif /* SYSEMU_CPU_TIMERS_H */

5
stubs/cpus-get-virtual-clock.c → stubs/cpus-virtual-clock.c
View file

@ -6,3 +6,8 @@ int64_t cpus_get_virtual_clock(void)
{
return cpu_get_clock();
}
void cpus_set_virtual_clock(int64_t new_time)
{
/* do nothing */
}

2
stubs/meson.build
View file

@ -29,7 +29,7 @@ endif
if have_block or have_ga
stub_ss.add(files('replay-tools.c'))
# stubs for hooks in util/main-loop.c, util/async.c etc.
stub_ss.add(files('cpus-get-virtual-clock.c'))
stub_ss.add(files('cpus-virtual-clock.c'))
stub_ss.add(files('icount.c'))
stub_ss.add(files('graph-lock.c'))
if linux_io_uring.found()

11
system/cpus.c
View file

@ -229,6 +229,17 @@ int64_t cpus_get_virtual_clock(void)
return cpu_get_clock();
}
/*
* Signal the new virtual time to the accelerator. This is only needed
* by accelerators that need to track the changes as we warp time.
*/
void cpus_set_virtual_clock(int64_t new_time)
{
if (cpus_accel && cpus_accel->set_virtual_clock) {
cpus_accel->set_virtual_clock(new_time);
}
}
/*
* return the time elapsed in VM between vm_start and vm_stop. Unless
* icount is active, cpus_get_elapsed_ticks() uses units of the host CPU cycle