RISC-V: KVM: Add VM capability to allow userspace get GPA bits
The number of GPA bits supported for a RISC-V Guest/VM is based on the
MMU mode used by the G-stage translation. The KVM RISC-V will detect and
use the best possible MMU mode for the G-stage in kvm_arch_init().
We add a generic VM capability KVM_CAP_VM_GPA_BITS which can be used by
the KVM userspace to get the number of GPA (guest physical address) bits
supported for a Guest/VM.
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-and-tested-by: Atish Patra <atishp@rivosinc.com>
diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
index 5f2736c..9af67db 100644
--- a/arch/riscv/kvm/mmu.c
+++ b/arch/riscv/kvm/mmu.c
@@ -769,3 +769,8 @@ unsigned long kvm_riscv_stage2_mode(void)
{
return stage2_mode >> HGATP_MODE_SHIFT;
}
+
+int kvm_riscv_stage2_gpa_bits(void)
+{
+ return stage2_gpa_bits;
+}