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target/ppc: correct htab shift for hash on radix

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KVM HV will soon support running a guest in hash mode on a POWER9 host
running in radix mode (see [1]), however the guest currently fails to
boot.

This is because the "htab_shift" value (the size of the MMU's hash
table) is added to the device tree before KVM has had a chance to
change it. If the host is in hash mode, KVM does not need to change it
and so the problem is not seen, but when the host is in radix mode a
change is required and we see a problem.

To fix this, move the call spapr_setup_hpt_and_vrma() (where
htab_shift could be changed) up a little so that it's called before
spapr_h_cas_compose_response() (where htab_shift is added to the
device tree).

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>

[1] See http://www.spinics.net/lists/kvm-ppc/msg13057.html
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Sam Bobroff 2017-11-06 14:14:35 +11:00 committed by David Gibson
parent 4e8a737c09
commit e05fba5004
1 changed files with 6 additions and 7 deletions
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13
hw/ppc/spapr_hcall.c
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@ -1636,6 +1636,12 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
spapr->cas_legacy_guest_workaround = !spapr_ovec_test(ov1_guest,
OV1_PPC_3_00);
if (!spapr->cas_reboot) {
/* If ppc_spapr_reset() did not set up a HPT but one is necessary
* (because the guest isn't going to use radix) then set it up here. */
if ((spapr->patb_entry & PATBE1_GR) && !guest_radix) {
/* legacy hash or new hash: */
spapr_setup_hpt_and_vrma(spapr);
}
spapr->cas_reboot =
(spapr_h_cas_compose_response(spapr, args[1], args[2],
ov5_updates) != 0);
@ -1644,13 +1650,6 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
if (spapr->cas_reboot) {
qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
} else {
/* If ppc_spapr_reset() did not set up a HPT but one is necessary
* (because the guest isn't going to use radix) then set it up here. */
if ((spapr->patb_entry & PATBE1_GR) && !guest_radix) {
/* legacy hash or new hash: */
spapr_setup_hpt_and_vrma(spapr);
}
}
return H_SUCCESS;