@@ -371,6 +371,17 @@ static int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *val)
return -EINVAL;
if (id == LOONGARCH_CSR_ESTAT) {
+ preempt_disable();
+ vcpu_load(vcpu);
+ /*
+ * Sync pending interrupt into estat so that interrupt
+ * remains during migration stage
+ */
+ kvm_deliver_intr(vcpu);
+ vcpu->arch.aux_inuse &= ~KVM_LARCH_SWCSR_LATEST;
+ vcpu_put(vcpu);
+ preempt_enable();
+
/* ESTAT IP0~IP7 get from GINTC */
gintc = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_GINTC) & 0xff;
*val = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_ESTAT) | (gintc << 2);
Currently interrupt is posted and cleared with asynchronous mode, and it is saved in SW state vcpu::arch::irq_pending and vcpu::arch::irq_clear. When vcpu is ready to run, pending interrupt is written back to ESTAT CSR register from SW state vcpu::arch::irq_pending at guest entrance. During VM migration stage, vcpu is put into stopped state, however pending interrupt is not synced to ESTAT CSR register. So there will be interrupt lost when VCPU is migrated to other host machines. Here when ESTAT CSR register is read from VMM user mode, pending interrupt is synchronized to ESTAT also. So that vcpu can get correct pending interrupt. Signed-off-by: Bibo Mao <maobibo@loongson.cn> --- arch/loongarch/kvm/vcpu.c | 11 +++++++++++ 1 file changed, 11 insertions(+)