Commit 78d7bc5a authored by Bibo Mao's avatar Bibo Mao Committed by Huacai Chen
Browse files

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: default avatarBibo Mao <maobibo@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 6fb1867d

arch/loongarch/kvm/main.c

+7 −0
Original line number Diff line number Diff line
@@ -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;

}