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-rw-r--r--target-ppc/kvm.c30
1 files changed, 25 insertions, 5 deletions
diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
index 546c11604c..1975323eb7 100644
--- a/target-ppc/kvm.c
+++ b/target-ppc/kvm.c
@@ -1127,18 +1127,38 @@ int kvmppc_reset_htab(int shift_hint)
{
uint32_t shift = shift_hint;
- if (kvm_enabled() &&
- kvm_check_extension(kvm_state, KVM_CAP_PPC_ALLOC_HTAB)) {
+ if (!kvm_enabled()) {
+ /* Full emulation, tell caller to allocate htab itself */
+ return 0;
+ }
+ if (kvm_check_extension(kvm_state, KVM_CAP_PPC_ALLOC_HTAB)) {
int ret;
ret = kvm_vm_ioctl(kvm_state, KVM_PPC_ALLOCATE_HTAB, &shift);
- if (ret < 0) {
+ if (ret == -ENOTTY) {
+ /* At least some versions of PR KVM advertise the
+ * capability, but don't implement the ioctl(). Oops.
+ * Return 0 so that we allocate the htab in qemu, as is
+ * correct for PR. */
+ return 0;
+ } else if (ret < 0) {
return ret;
}
return shift;
}
- /* For now.. */
- return 0;
+ /* We have a kernel that predates the htab reset calls. For PR
+ * KVM, we need to allocate the htab ourselves, for an HV KVM of
+ * this era, it has allocated a 16MB fixed size hash table
+ * already. Kernels of this era have the GET_PVINFO capability
+ * only on PR, so we use this hack to determine the right
+ * answer */
+ if (kvm_check_extension(kvm_state, KVM_CAP_PPC_GET_PVINFO)) {
+ /* PR - tell caller to allocate htab */
+ return 0;
+ } else {
+ /* HV - assume 16MB kernel allocated htab */
+ return 24;
+ }
}
static inline uint32_t mfpvr(void)