[PATCH 2/4] spapr: Simplify selection of radix/hash during CAS

Greg Kurz posted 4 patches 8 weeks ago
Maintainers: David Gibson <david@gibson.dropbear.id.au>

[PATCH 2/4] spapr: Simplify selection of radix/hash during CAS

Posted by Greg Kurz 8 weeks ago
The guest can select the MMU mode by setting bits 0-1 of byte 24
in OV5 to to 0b00 for hash or 0b01 for radix. As required by the
architecture, we terminate the boot process if any other value
is found there.

The usual way to negotiate features in OV5 is basically ANDing
the bitfield provided by the guest and the bitfield of features
supported by QEMU, previously populated at machine init.

For some not documented reason, MMU is treated differently : bit 1
of byte 24 (the radix/hash bit) is cleared from the guest OV5 and
explicitely set in the final negotiated OV5 if radix was requested.

Since the only expected input from the guest is the radix/hash bit
being set or not, it seems more appropriate to handle this like we
do for XIVE.

Set the radix bit in spapr->ov5 at machine init if it has a chance
to work (ie. power9, either TCG or a radix capable KVM) and rely
exclusively on spapr_ovec_intersect() to set the radix bit in

Signed-off-by: Greg Kurz <groug@kaod.org>
 hw/ppc/spapr.c       |    1 +
 hw/ppc/spapr_hcall.c |    6 +-----
 2 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 9a2bd501aa6e..91f8cfe7a8b1 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -2837,6 +2837,7 @@ static void spapr_machine_init(MachineState *machine)
     if ((!kvm_enabled() || kvmppc_has_cap_mmu_radix()) &&
         ppc_type_check_compat(machine->cpu_type, CPU_POWERPC_LOGICAL_3_00, 0,
                               spapr->max_compat_pvr)) {
+        spapr_ovec_set(spapr->ov5, OV5_MMU_RADIX_300);
         /* KVM and TCG always allow GTSE with radix... */
         spapr_ovec_set(spapr->ov5, OV5_MMU_RADIX_GTSE);
diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 1f123a68e46c..9bed659b1a94 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -1738,9 +1738,7 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
-    /* The radix/hash bit in byte 24 requires special handling: */
     guest_radix = spapr_ovec_test(ov5_guest, OV5_MMU_RADIX_300);
-    spapr_ovec_clear(ov5_guest, OV5_MMU_RADIX_300);
     guest_xive = spapr_ovec_test(ov5_guest, OV5_XIVE_EXPLOIT);
@@ -1785,14 +1783,12 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
     /* full range of negotiated ov5 capabilities */
     spapr_ovec_intersect(spapr->ov5_cas, spapr->ov5, ov5_guest);
-    /* Now that processing is finished, set the radix/hash bit for the
-     * guest if it requested a valid mode; otherwise terminate the boot. */
     if (guest_radix) {
         if (kvm_enabled() && !kvmppc_has_cap_mmu_radix()) {
             error_report("Guest requested unavailable MMU mode (radix).");
-        spapr_ovec_set(spapr->ov5_cas, OV5_MMU_RADIX_300);
     } else {
         if (kvm_enabled() && kvmppc_has_cap_mmu_radix()
             && !kvmppc_has_cap_mmu_hash_v3()) {