KVM: PPC: Book3S HV: Speed up wakeups of CPUs on HV KVM

Currently, we wake up a CPU by sending a host IPI with
smp_send_reschedule() to thread 0 of that core, which will take all
threads out of the guest, and cause them to re-evaluate their
interrupt status on the way back in.

This adds a mechanism to differentiate real host IPIs from IPIs sent
by KVM for guest threads to poke each other, in order to target the
guest threads precisely when possible and avoid that global switch of
the core to host state.

We then use this new facility in the in-kernel XICS code.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/xics/icp-native.c b/arch/powerpc/sysdev/xics/icp-native.c
index 48861d3fcd07..20b328bb494d 100644
--- a/arch/powerpc/sysdev/xics/icp-native.c
+++ b/arch/powerpc/sysdev/xics/icp-native.c
@@ -51,6 +51,12 @@ static struct icp_ipl __iomem *icp_native_regs[NR_CPUS];
 static inline unsigned int icp_native_get_xirr(void)
 {
         int cpu = smp_processor_id();
+        unsigned int xirr;
+
+        /* Handled an interrupt latched by KVM */
+        xirr = kvmppc_get_xics_latch();
+        if (xirr)
+                return xirr;
 
         return in_be32(&icp_native_regs[cpu]->xirr.word);
 }
@@ -138,6 +144,7 @@ static unsigned int icp_native_get_irq(void)
 
 static void icp_native_cause_ipi(int cpu, unsigned long data)
 {
+        kvmppc_set_host_ipi(cpu, 1);
         icp_native_set_qirr(cpu, IPI_PRIORITY);
 }
 
@@ -151,6 +158,7 @@ static irqreturn_t icp_native_ipi_action(int irq, void *dev_id)
 {
         int cpu = smp_processor_id();
 
+        kvmppc_set_host_ipi(cpu, 0);
         icp_native_set_qirr(cpu, 0xff);
 
         return smp_ipi_demux();