From 78d7bc5a02e1468df53896df354fa80727f35b7d Mon Sep 17 00:00:00 2001 From: Bibo Mao Date: Sat, 8 Mar 2025 13:52:01 +0800 Subject: [PATCH] LoongArch: KVM: Reload guest CSR registers after sleep On host, the HW guest CSR registers are lost after suspend and resume operation. Since last_vcpu of boot CPU still records latest vCPU pointer so that the 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. Cc: stable@vger.kernel.org Signed-off-by: Bibo Mao Signed-off-by: Huacai Chen --- arch/loongarch/kvm/main.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c index f6d3242b9234..b6864d6e5ec8 100644 --- a/arch/loongarch/kvm/main.c +++ b/arch/loongarch/kvm/main.c @@ -317,6 +317,13 @@ 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; }