commit ecbc25fa86ce44cf5aea94adaf79ea8428f12f4b
author David Gibson <david@gibson.dropbear.id.au> Thu Jan 21 14:48:43 2016 +1100
committer David Gibson <david@gibson.dropbear.id.au> Sat Jan 30 23:37:38 2016 +1100
tree 4c248af1b43be98aa37e5e81fa85956f354efea7
parent 1438eff302cbc6c85d477fd7181b8a9aeea2efd7

pseries: Allow TCG h_enter to work with hotplugged memory

The implementation of the H_ENTER hypercall for PAPR guests needs to
enforce correct access attributes on the inserted HPTE.  This means
determining if the HPTE's real address is a regular RAM address (which
requires attributes for coherent access) or an IO address (which requires
attributes for cache-inhibited access).

At the moment this check is implemented with (raddr < machine->ram_size),
but that only handles addresses in the base RAM area, not any hotplugged
RAM.

This patch corrects the problem with a new helper.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>

hw/ppc/spapr_hcall.c

diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 655c433..093d426 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -85,10 +85,25 @@
     return true;
 }
 
+static bool is_ram_address(sPAPRMachineState *spapr, hwaddr addr)
+{
+    MachineState *machine = MACHINE(spapr);
+    MemoryHotplugState *hpms = &spapr->hotplug_memory;
+
+    if (addr < machine->ram_size) {
+        return true;
+    }
+    if ((addr >= hpms->base)
+        && ((addr - hpms->base) < memory_region_size(&hpms->mr))) {
+        return true;
+    }
+
+    return false;
+}
+
 static target_ulong h_enter(PowerPCCPU *cpu, sPAPRMachineState *spapr,
                             target_ulong opcode, target_ulong *args)
 {
-    MachineState *machine = MACHINE(spapr);
     CPUPPCState *env = &cpu->env;
     target_ulong flags = args[0];
     target_ulong pte_index = args[1];
@@ -120,7 +135,7 @@
 
     raddr = (ptel & HPTE64_R_RPN) & ~((1ULL << page_shift) - 1);
 
-    if (raddr < machine->ram_size) {
+    if (is_ram_address(spapr, raddr)) {
         /* Regular RAM - should have WIMG=0010 */
         if ((ptel & HPTE64_R_WIMG) != HPTE64_R_M) {
             return H_PARAMETER;