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LoongArch: KVM: Implement kvm hardware enable, disable interface

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

Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Tested-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Tianrui Zhao 2023-10-02 10:01:20 +08:00 • committed by Huacai Chen
parent 2bd6ac6872
commit 0d0df3c99d
1 changed files with 62 additions and 0 deletions
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62
arch/loongarch/kvm/main.c
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@ -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;