Implement kvm hardware enable, disable interface, setting
the guest config register to enable virtualization features
when called the interface.
Signed-off-by: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>
---
arch/loongarch/kvm/main.c | 71 +++++++++++++++++++++++++++++++++++++++
1 file changed, 71 insertions(+)
diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c
index d7969d02a..6afd97823 100644
--- a/arch/loongarch/kvm/main.c
+++ b/arch/loongarch/kvm/main.c
@@ -11,6 +11,77 @@
static struct kvm_context __percpu *vmcs;
+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_check_processor_compat(void *opaque)
+{
+ return 0;
+}
+
+int kvm_arch_hardware_setup(void *opaque)
+{
+ return 0;
+}
+
+int kvm_arch_hardware_enable(void)
+{
+ unsigned long gcfg = 0;
+
+ /* First init gtlbc, gcfg, gstat, gintc. All guest use the same config */
+ clear_csr_gtlbc(CSR_GTLBC_USETGID | CSR_GTLBC_TOTI);
+ write_csr_gcfg(0);
+ write_csr_gstat(0);
+ write_csr_gintc(0);
+
+ /*
+ * 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 (cpu_has_gcip_all)
+ gcfg |= CSR_GCFG_GCI_SECURE;
+ if (cpu_has_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("gtlbc:%llx gintc:%llx gstat:%llx gcfg:%llx",
+ read_csr_gtlbc(), read_csr_gintc(),
+ read_csr_gstat(), read_csr_gcfg());
+
+ return 0;
+}
+
+void kvm_arch_hardware_disable(void)
+{
+ clear_csr_gtlbc(CSR_GTLBC_USETGID | CSR_GTLBC_TOTI);
+ write_csr_gcfg(0);
+ write_csr_gstat(0);
+ write_csr_gintc(0);
+
+ /* Flush any remaining guest TLB entries */
+ kvm_flush_tlb_all();
+}
+
int kvm_arch_init(void *opaque)
{
struct kvm_context *context;
--
2.31.1
