From: Bibo Mao Date: Sat, 8 Mar 2025 05:52:01 +0000 (+0800) Subject: LoongArch: KVM: Reload guest CSR registers after sleep X-Git-Tag: v6.14-rc6~8^2~1 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=78d7bc5a02e1468df53896df354fa80727f35b7d;p=thirdparty%2Fkernel%2Flinux.git 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 --- diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c index f6d3242b9234a..b6864d6e5ec8d 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; }