From: Jason Wang <jasowang@xxxxxxxxxx>
We used to have PV version of send_IPI_mask and
send_IPI_mask_allbutself. This patch implements PV send_IPI method to
reduce the number of vmexits.
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
Tested-by: Cindy Lu <lulu@xxxxxxxxxx>
---
arch/x86/kernel/kvm.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 921c1c783bc1..b920cfd10441 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -557,6 +557,11 @@ static void __send_ipi_mask(const struct cpumask *mask, int vector)
local_irq_restore(flags);
}
+static void kvm_send_ipi(int cpu, int vector)
+{
+ __send_ipi_mask(cpumask_of(cpu), vector);
+}
+
static void kvm_send_ipi_mask(const struct cpumask *mask, int vector)
{
__send_ipi_mask(mask, vector);
@@ -628,6 +633,7 @@ late_initcall(setup_efi_kvm_sev_migration);
*/
static __init void kvm_setup_pv_ipi(void)
{
+ apic_update_callback(send_IPI, kvm_send_ipi);
apic_update_callback(send_IPI_mask, kvm_send_ipi_mask);
apic_update_callback(send_IPI_mask_allbutself, kvm_send_ipi_mask_allbutself);
pr_info("setup PV IPIs\n");
--
2.45.0
