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spapr_iommu: Migrate full state

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The source guest could have reallocated the default TCE table and
migrate bigger/smaller table. This adds reallocation in post_load()
if the default table size is different on source and destination.

This adds @bus_offset, @page_shift to the migration stream as
a subsection so when DDW is added, migration to older machines will
still be possible. As @bus_offset and @page_shift are not used yet,
this makes no change in behavior.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Alexey Kardashevskiy 2016-06-01 18:57:34 +10:00 • committed by David Gibson
parent df7625d422
commit a26fdf3934
3 changed files with 67 additions and 3 deletions
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65
hw/ppc/spapr_iommu.c
View file

@ -138,33 +138,92 @@ static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr,
return ret;
}
static void spapr_tce_table_pre_save(void *opaque)
{
sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque);
tcet->mig_table = tcet->table;
tcet->mig_nb_table = tcet->nb_table;
trace_spapr_iommu_pre_save(tcet->liobn, tcet->mig_nb_table,
tcet->bus_offset, tcet->page_shift);
}
static int spapr_tce_table_post_load(void *opaque, int version_id)
{
sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque);
uint32_t old_nb_table = tcet->nb_table;
uint64_t old_bus_offset = tcet->bus_offset;
uint32_t old_page_shift = tcet->page_shift;
if (tcet->vdev) {
spapr_vio_set_bypass(tcet->vdev, tcet->bypass);
}
if (tcet->mig_nb_table != tcet->nb_table) {
spapr_tce_table_disable(tcet);
}
if (tcet->mig_nb_table) {
if (!tcet->nb_table) {
spapr_tce_table_enable(tcet, old_page_shift, old_bus_offset,
tcet->mig_nb_table);
}
memcpy(tcet->table, tcet->mig_table,
tcet->nb_table * sizeof(tcet->table[0]));
free(tcet->mig_table);
tcet->mig_table = NULL;
}
trace_spapr_iommu_post_load(tcet->liobn, old_nb_table, tcet->nb_table,
tcet->bus_offset, tcet->page_shift);
return 0;
}
static bool spapr_tce_table_ex_needed(void *opaque)
{
sPAPRTCETable *tcet = opaque;
return tcet->bus_offset || tcet->page_shift != 0xC;
}
static const VMStateDescription vmstate_spapr_tce_table_ex = {
.name = "spapr_iommu_ex",
.version_id = 1,
.minimum_version_id = 1,
.needed = spapr_tce_table_ex_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64(bus_offset, sPAPRTCETable),
VMSTATE_UINT32(page_shift, sPAPRTCETable),
VMSTATE_END_OF_LIST()
},
};
static const VMStateDescription vmstate_spapr_tce_table = {
.name = "spapr_iommu",
.version_id = 2,
.minimum_version_id = 2,
.pre_save = spapr_tce_table_pre_save,
.post_load = spapr_tce_table_post_load,
.fields = (VMStateField []) {
/* Sanity check */
VMSTATE_UINT32_EQUAL(liobn, sPAPRTCETable),
VMSTATE_UINT32_EQUAL(nb_table, sPAPRTCETable),
/* IOMMU state */
VMSTATE_UINT32(mig_nb_table, sPAPRTCETable),
VMSTATE_BOOL(bypass, sPAPRTCETable),
VMSTATE_VARRAY_UINT32(table, sPAPRTCETable, nb_table, 0, vmstate_info_uint64, uint64_t),
VMSTATE_VARRAY_UINT32_ALLOC(mig_table, sPAPRTCETable, mig_nb_table, 0,
vmstate_info_uint64, uint64_t),
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription*[]) {
&vmstate_spapr_tce_table_ex,
NULL
}
};
static MemoryRegionIOMMUOps spapr_iommu_ops = {
@ -264,7 +323,7 @@ void spapr_tce_table_enable(sPAPRTCETable *tcet,
(uint64_t)tcet->nb_table << tcet->page_shift);
}
static void spapr_tce_table_disable(sPAPRTCETable *tcet)
void spapr_tce_table_disable(sPAPRTCETable *tcet)
{
if (!tcet->nb_table) {
return;