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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>
(cherry picked from commit bac3bf287a)
This commit is contained in:
Thomas Huth 2016-09-28 13:16:30 +02:00 committed by David Gibson
parent 45a4f18e2e
commit 2e68f28854
3 changed files with 17 additions and 1 deletions
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5
hw/ppc/spapr.c
View File

@ -603,7 +603,7 @@ 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;
@ -632,6 +632,9 @@ 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)));
}

7
target-ppc/kvm.c
View File

@ -79,6 +79,7 @@ static int cap_ppc_watchdog;
static int cap_papr;
static int cap_htab_fd;
static int cap_fixup_hcalls;
static int cap_htm; /* Hardware transactional memory support */
static uint32_t debug_inst_opcode;
@ -121,6 +122,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
* only activated after this by kvmppc_set_papr() */
cap_htab_fd = kvm_check_extension(s, KVM_CAP_PPC_HTAB_FD);
cap_fixup_hcalls = kvm_check_extension(s, KVM_CAP_PPC_FIXUP_HCALL);
cap_htm = kvm_vm_check_extension(s, KVM_CAP_PPC_HTM);
if (!cap_interrupt_level) {
fprintf(stderr, "KVM: Couldn't find level irq capability. Expect the "
@ -2339,6 +2341,11 @@ bool kvmppc_has_cap_fixup_hcalls(void)
return cap_fixup_hcalls;
}
bool kvmppc_has_cap_htm(void)
{
return cap_htm;
}
static PowerPCCPUClass *ppc_cpu_get_family_class(PowerPCCPUClass *pcc)
{
ObjectClass *oc = OBJECT_CLASS(pcc);

6
target-ppc/kvm_ppc.h
View File

@ -54,6 +54,7 @@ void kvmppc_hash64_free_pteg(uint64_t token);
void kvmppc_hash64_write_pte(CPUPPCState *env, target_ulong pte_index,
target_ulong pte0, target_ulong pte1);
bool kvmppc_has_cap_fixup_hcalls(void);
bool kvmppc_has_cap_htm(void);
int kvmppc_enable_hwrng(void);
int kvmppc_put_books_sregs(PowerPCCPU *cpu);
PowerPCCPUClass *kvm_ppc_get_host_cpu_class(void);
@ -244,6 +245,11 @@ static inline bool kvmppc_has_cap_fixup_hcalls(void)
abort();
}
static inline bool kvmppc_has_cap_htm(void)
{
return false;
}
static inline int kvmppc_enable_hwrng(void)
{
return -1;