[PATCH 5.1 36/85] KVM: PPC: Book3S HV: Restore SPRG3 in kvmhv_p9_guest_entry()

[Greg Kroah-Hartman]

From: Suraj Jitindar Singh <sjitindarsingh@xxxxxxxxx>

commit d724c9e54939a597592de3659541da11fc7aa112 upstream.

The sprgs are a set of 4 general purpose sprs provided for software use.
SPRG3 is special in that it can also be read from userspace. Thus it is
used on linux to store the cpu and numa id of the process to speed up
syscall access to this information.

This register is overwritten with the guest value on kvm guest entry,
and so needs to be restored on exit again. Thus restore the value on
the guest exit path in kvmhv_p9_guest_entry().

Cc: stable@xxxxxxxxxxxxxxx # v4.20+
Fixes: 95a6432ce9038 ("KVM: PPC: Book3S HV: Streamlined guest entry/exit path on P9 for radix guests")

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@xxxxxxxxx>
Signed-off-by: Paul Mackerras <paulus@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/powerpc/kvm/book3s_hv.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -3624,6 +3624,7 @@ int kvmhv_p9_guest_entry(struct kvm_vcpu
 	vc->in_guest = 0;
 
 	mtspr(SPRN_DEC, local_paca->kvm_hstate.dec_expires - mftb());
+	mtspr(SPRN_SPRG_VDSO_WRITE, local_paca->sprg_vdso);
 
 	kvmhv_load_host_pmu();