On host HW guest CSR registers are lost after suspend and resume
operation. Since last_vcpu of boot CPU still records latest vCPU pointer
so that guest CSR register skips to reload when boot CPU resumes and
vCPU is scheduled.
Here last_vcpu is cleared so that guest CSR registers will reload from
scheduled vCPU context after suspend and resume.
Signed-off-by: Bibo Mao <maobibo@xxxxxxxxxxx>
---
arch/loongarch/kvm/main.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c
index f6d3242b9234..af4d730196ef 100644
--- a/arch/loongarch/kvm/main.c
+++ b/arch/loongarch/kvm/main.c
@@ -317,6 +317,12 @@ int kvm_arch_enable_virtualization_cpu(void)
kvm_debug("GCFG:%lx GSTAT:%lx GINTC:%lx GTLBC:%lx",
read_csr_gcfg(), read_csr_gstat(), read_csr_gintc(), read_csr_gtlbc());
+ /*
+ * HW Guest CSR registers are lost after CPU suspend and resume.
+ * Clear last_vcpu so that Guest CSR registers forced to reload
+ * from vCPU SW state
+ */
+ this_cpu_ptr(vmcs)->last_vcpu = NULL;
return 0;
}
--
2.39.3
