pseries: Stubs for HPT resizing

This introduces stub implementations of the H_RESIZE_HPT_PREPARE and
H_RESIZE_HPT_COMMIT hypercalls which we hope to add in a PAPR
extension to allow run time resizing of a guest's hash page table.  It
also adds a new machine property for controlling whether this new
facility is available.

For now we only allow resizing with TCG, allowing it with KVM will require
kernel changes as well.

Finally, it adds a new string to the hypertas property in the device
tree, advertising to the guest the availability of the HPT resizing
hypercalls.  This is a tentative suggested value, and would need to be
standardized by PAPR before being merged.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 2ddec025d2..10ddb90711 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -42,6 +42,13 @@ typedef struct sPAPRMachineClass sPAPRMachineClass;
 #define SPAPR_MACHINE_CLASS(klass) \
     OBJECT_CLASS_CHECK(sPAPRMachineClass, klass, TYPE_SPAPR_MACHINE)
 
+typedef enum {
+    SPAPR_RESIZE_HPT_DEFAULT = 0,
+    SPAPR_RESIZE_HPT_DISABLED,
+    SPAPR_RESIZE_HPT_ENABLED,
+    SPAPR_RESIZE_HPT_REQUIRED,
+} sPAPRResizeHPT;
+
 /**
  * sPAPRMachineClass:
  */
@@ -58,6 +65,7 @@ struct sPAPRMachineClass {
                           uint64_t *buid, hwaddr *pio, 
                           hwaddr *mmio32, hwaddr *mmio64,
                           unsigned n_dma, uint32_t *liobns, Error **errp);
+    sPAPRResizeHPT resize_hpt_default;
 };
 
 /**
@@ -73,6 +81,7 @@ struct sPAPRMachineState {
     ICSState *ics;
     sPAPRRTCState rtc;
 
+    sPAPRResizeHPT resize_hpt;
     void *htab;
     uint32_t htab_shift;
     uint64_t patb_entry; /* Process tbl registed in H_REGISTER_PROCESS_TABLE */
@@ -367,6 +376,8 @@ struct sPAPRMachineState {
 #define H_XIRR_X                0x2FC
 #define H_RANDOM                0x300
 #define H_SET_MODE              0x31C
+#define H_RESIZE_HPT_PREPARE    0x36C
+#define H_RESIZE_HPT_COMMIT     0x370
 #define H_CLEAN_SLB             0x374
 #define H_INVALIDATE_PID        0x378
 #define H_REGISTER_PROC_TBL     0x37C