6.12-stable review patch. If anyone has any objections, please let me know.
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From: Bibo Mao maobibo@loongson.cn
commit 78d7bc5a02e1468df53896df354fa80727f35b7d upstream.
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 maobibo@loongson.cn Signed-off-by: Huacai Chen chenhuacai@loongson.cn Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/loongarch/kvm/main.c | 7 +++++++ 1 file changed, 7 insertions(+)
--- a/arch/loongarch/kvm/main.c +++ b/arch/loongarch/kvm/main.c @@ -297,6 +297,13 @@ int kvm_arch_enable_virtualization_cpu(v 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; }