Commit 0d0df3c9 authored by Tianrui Zhao's avatar Tianrui Zhao Committed by Huacai Chen
Browse files

LoongArch: KVM: Implement kvm hardware enable, disable interface 



Implement kvm hardware enable, disable interface, setting the
guest config register to enable virtualization features when called
the interface.

Reviewed-by: default avatarBibo Mao <maobibo@loongson.cn>
Tested-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
Signed-off-by: default avatarTianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 2bd6ac68

arch/loongarch/kvm/main.c

+62 −0
Original line number Diff line number Diff line
@@ -249,6 +249,68 @@ void kvm_check_vpid(struct kvm_vcpu *vcpu) 
	change_csr_gstat(vpid_mask << CSR_GSTAT_GID_SHIFT, vpid);

}



void kvm_init_vmcs(struct kvm *kvm)

{

	kvm->arch.vmcs = vmcs;

}



long kvm_arch_dev_ioctl(struct file *filp,

			unsigned int ioctl, unsigned long arg)

{

	return -ENOIOCTLCMD;

}



int kvm_arch_hardware_enable(void)

{

	unsigned long env, gcfg = 0;



	env = read_csr_gcfg();



	/* First init gcfg, gstat, gintc, gtlbc. All guest use the same config */

	write_csr_gcfg(0);

	write_csr_gstat(0);

	write_csr_gintc(0);

	clear_csr_gtlbc(CSR_GTLBC_USETGID | CSR_GTLBC_TOTI);



	/*

	 * Enable virtualization features granting guest direct control of

	 * certain features:

	 * GCI=2:       Trap on init or unimplement cache instruction.

	 * TORU=0:      Trap on Root Unimplement.

	 * CACTRL=1:    Root control cache.

	 * TOP=0:       Trap on Previlege.

	 * TOE=0:       Trap on Exception.

	 * TIT=0:       Trap on Timer.

	 */

	if (env & CSR_GCFG_GCIP_ALL)

		gcfg |= CSR_GCFG_GCI_SECURE;

	if (env & CSR_GCFG_MATC_ROOT)

		gcfg |= CSR_GCFG_MATC_ROOT;



	gcfg |= CSR_GCFG_TIT;

	write_csr_gcfg(gcfg);



	kvm_flush_tlb_all();



	/* Enable using TGID  */

	set_csr_gtlbc(CSR_GTLBC_USETGID);

	kvm_debug("GCFG:%lx GSTAT:%lx GINTC:%lx GTLBC:%lx",

		  read_csr_gcfg(), read_csr_gstat(), read_csr_gintc(), read_csr_gtlbc());



	return 0;

}



void kvm_arch_hardware_disable(void)

{

	write_csr_gcfg(0);

	write_csr_gstat(0);

	write_csr_gintc(0);

	clear_csr_gtlbc(CSR_GTLBC_USETGID | CSR_GTLBC_TOTI);



	/* Flush any remaining guest TLB entries */

	kvm_flush_tlb_all();

}



static int kvm_loongarch_env_init(void)

{

	int cpu, order;