On Tue, Aug 20, 2024 at 01:35:41PM +0900, Suleiman Souhlal wrote:
>It returns the cumulative nanoseconds that the host has been suspended.
>It is intended to be used for reporting host suspend time to the guest.
>
>Signed-off-by: Suleiman Souhlal <suleiman@xxxxxxxxxx>
Reviewed-by: Chao Gao <chao.gao@xxxxxxxxx>
one nit below
>---
> include/linux/kvm_host.h | 2 ++
> virt/kvm/kvm_main.c | 13 +++++++++++++
> 2 files changed, 15 insertions(+)
>
>diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
>index b23c6d48392f7c..8fec37b372d8c0 100644
>--- a/include/linux/kvm_host.h
>+++ b/include/linux/kvm_host.h
>@@ -2494,4 +2494,6 @@ long kvm_arch_vcpu_pre_fault_memory(struct kvm_vcpu *vcpu,
> struct kvm_pre_fault_memory *range);
> #endif
>
>+u64 kvm_total_suspend_ns(void);
>+
> #endif
>diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
>index cb2b78e92910fb..2235933d9247bc 100644
>--- a/virt/kvm/kvm_main.c
>+++ b/virt/kvm/kvm_main.c
>@@ -5720,6 +5720,15 @@ static void kvm_shutdown(void)
> on_each_cpu(hardware_disable_nolock, NULL, 1);
> }
>
>+static u64 last_suspend;
>+static u64 total_suspend_ns;
>+
>+u64
>+kvm_total_suspend_ns(void)
nit: don't wrap before the function name.
>+{
>+ return total_suspend_ns;
>+}
>+
> static int kvm_suspend(void)
> {
> /*
>@@ -5735,6 +5744,8 @@ static int kvm_suspend(void)
>
> if (kvm_usage_count)
> hardware_disable_nolock(NULL);
>+
>+ last_suspend = ktime_get_boottime_ns();
> return 0;
> }
>
>@@ -5745,6 +5756,8 @@ static void kvm_resume(void)
>
> if (kvm_usage_count)
> WARN_ON_ONCE(__hardware_enable_nolock());
>+
>+ total_suspend_ns += ktime_get_boottime_ns() - last_suspend;
> }
>
> static struct syscore_ops kvm_syscore_ops = {
>--
>2.46.0.184.g6999bdac58-goog
>
