Hi Mohamed, On 21/7/25 17:29, Mohamed Mediouni wrote:
On Apple M3 and later, the timer frequency within apps and VM guests are different from each other.
Also M1/M2, so all Apple Silicon chipsets IMO. This might be the issue I fixed here: https://lore.kernel.org/qemu-devel/20250620130709.31073-18-phi...@linaro.org/
Note that app binaries compiled with older SDKs continue to retain a non-1 GHz timer frequency on Apple M3/M4. Signed-off-by: Mohamed Mediouni <moha...@unpredictable.fr> --- target/arm/hvf/hvf.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c index c9cfcdc08b..4331a3386a 100644 --- a/target/arm/hvf/hvf.c +++ b/target/arm/hvf/hvf.c @@ -1018,6 +1018,13 @@ int hvf_arch_init_vcpu(CPUState *cpu) int i;env->aarch64 = true;+ /* + * TODO: This does not correspond to the exposed generic + * timer frequency to the guest on Apple M3/M4. + * This is due to a scaled 1GHz counter being exposed + * to applications built with newer SDKs when running + * on that silicon, while VMs get an unscaled counter. + */ asm volatile("mrs %0, cntfrq_el0" : "=r"(arm_cpu->gt_cntfrq_hz));
