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ppc: Check the availability of transactional memory

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KVM-PR currently does not support transactional memory, and the
implementation in TCG is just a fake. We should not announce TM
support in the ibm,pa-features property when running on such a
system, so disable it by default and only enable it if the KVM
implementation supports it (i.e. recent versions of KVM-HV).
These changes are based on some earlier work from Anton Blanchard
(thanks!).

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Thomas Huth 2016-09-28 13:16:30 +02:00 • committed by David Gibson
parent 4cbec30d76
commit bac3bf287a
3 changed files with 17 additions and 1 deletions
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5
hw/ppc/spapr.c
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@ -555,7 +555,7 @@ static void spapr_populate_pa_features(CPUPPCState *env, void *fdt, int offset)
0xf6, 0x1f, 0xc7, 0xc0, 0x80, 0xf0,
0x80, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00, 0x80, 0x00 };
0x80, 0x00, 0x80, 0x00, 0x00, 0x00 };
uint8_t *pa_features;
size_t pa_size;
@ -584,6 +584,9 @@ static void spapr_populate_pa_features(CPUPPCState *env, void *fdt, int offset)
*/
pa_features[3] |= 0x20;
}
if (kvmppc_has_cap_htm() && pa_size > 24) {
pa_features[24] |= 0x80; /* Transactional memory support */
}
_FDT((fdt_setprop(fdt, offset, "ibm,pa-features", pa_features, pa_size)));
}