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spapr: Workaround for broken radix guests

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For a little while around 4.9, Linux kernels that saw the radix bit in
ibm,pa-features would attempt to set up the MMU as if they were a
hypervisor, even if they were a guest, which would cause them to
crash.

Work around this by detecting pre-ISA 3.0 guests by their lack of that
bit in option vector 1, and then removing the radix bit from
ibm,pa-features. Note: This now requires regeneration of that node
after CAS negotiation.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
[dwg: Fix style nits]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Sam Bobroff 2017-03-20 10:46:49 +11:00 • committed by David Gibson
parent 9fb4541f58
commit e957f6a9b9
4 changed files with 21 additions and 4 deletions
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1
include/hw/ppc/spapr.h
View file

@ -89,6 +89,7 @@ struct sPAPRMachineState {
sPAPROptionVector *ov5; /* QEMU-supported option vectors */
sPAPROptionVector *ov5_cas; /* negotiated (via CAS) option vectors */
bool cas_reboot;
bool cas_legacy_guest_workaround;
Notifier epow_notifier;
QTAILQ_HEAD(, sPAPREventLogEntry) pending_events;

3
include/hw/ppc/spapr_ovec.h
View file

@ -43,6 +43,9 @@ typedef struct sPAPROptionVector sPAPROptionVector;
#define OV_BIT(byte, bit) ((byte - 1) * BITS_PER_BYTE + bit)
/* option vector 1 */
#define OV1_PPC_3_00 OV_BIT(3, 0) /* guest supports PowerPC 3.00? */
/* option vector 5 */
#define OV5_DRCONF_MEMORY OV_BIT(2, 2)
#define OV5_FORM1_AFFINITY OV_BIT(5, 0)