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arm_gicv3_kvm: kvm_dist_get/put: skip the registers banked by GICR

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While we skip the GIC_INTERNAL irqs, we don't change the register offset
accordingly. This will overlap the GICR registers value and leave the
last GIC_INTERNAL irq's registers out of update.

Fix this by skipping the registers banked by GICR.

Also for migration compatibility if the migration source (old version
qemu) doesn't send gicd_no_migration_shift_bug = 1 to destination, then
we shift the data of PPI to get the right data for SPI.

Fixes: 367b9f527b
Cc: qemu-stable@nongnu.org
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Shannon Zhao <zhaoshenglong@huawei.com>
Message-id: 1527816987-16108-1-git-send-email-zhaoshenglong@huawei.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Shannon Zhao 2018-06-08 13:15:32 +01:00 • committed by Peter Maydell
parent bac5ba3dc5
commit 910e204841
3 changed files with 118 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

79
hw/intc/arm_gicv3_common.c
View file

@ -27,6 +27,7 @@
#include "hw/intc/arm_gicv3_common.h"
#include "gicv3_internal.h"
#include "hw/arm/linux-boot-if.h"
#include "sysemu/kvm.h"
static int gicv3_pre_save(void *opaque)
{
@ -141,6 +142,79 @@ static const VMStateDescription vmstate_gicv3_cpu = {
}
};
static int gicv3_gicd_no_migration_shift_bug_pre_load(void *opaque)
{
GICv3State *cs = opaque;
/*
* The gicd_no_migration_shift_bug flag is used for migration compatibility
* for old version QEMU which may have the GICD bmp shift bug under KVM mode.
* Strictly, what we want to know is whether the migration source is using
* KVM. Since we don't have any way to determine that, we look at whether the
* destination is using KVM; this is close enough because for the older QEMU
* versions with this bug KVM -> TCG migration didn't work anyway. If the
* source is a newer QEMU without this bug it will transmit the migration
* subsection which sets the flag to true; otherwise it will remain set to
* the value we select here.
*/
if (kvm_enabled()) {
cs->gicd_no_migration_shift_bug = false;
}
return 0;
}
static int gicv3_gicd_no_migration_shift_bug_post_load(void *opaque,
int version_id)
{
GICv3State *cs = opaque;
if (cs->gicd_no_migration_shift_bug) {
return 0;
}
/* Older versions of QEMU had a bug in the handling of state save/restore
* to the KVM GICv3: they got the offset in the bitmap arrays wrong,
* so that instead of the data for external interrupts 32 and up
* starting at bit position 32 in the bitmap, it started at bit
* position 64. If we're receiving data from a QEMU with that bug,
* we must move the data down into the right place.
*/
memmove(cs->group, (uint8_t *)cs->group + GIC_INTERNAL / 8,
sizeof(cs->group) - GIC_INTERNAL / 8);
memmove(cs->grpmod, (uint8_t *)cs->grpmod + GIC_INTERNAL / 8,
sizeof(cs->grpmod) - GIC_INTERNAL / 8);
memmove(cs->enabled, (uint8_t *)cs->enabled + GIC_INTERNAL / 8,
sizeof(cs->enabled) - GIC_INTERNAL / 8);
memmove(cs->pending, (uint8_t *)cs->pending + GIC_INTERNAL / 8,
sizeof(cs->pending) - GIC_INTERNAL / 8);
memmove(cs->active, (uint8_t *)cs->active + GIC_INTERNAL / 8,
sizeof(cs->active) - GIC_INTERNAL / 8);
memmove(cs->edge_trigger, (uint8_t *)cs->edge_trigger + GIC_INTERNAL / 8,
sizeof(cs->edge_trigger) - GIC_INTERNAL / 8);
/*
* While this new version QEMU doesn't have this kind of bug as we fix it,
* so it needs to set the flag to true to indicate that and it's necessary
* for next migration to work from this new version QEMU.
*/
cs->gicd_no_migration_shift_bug = true;
return 0;
}
const VMStateDescription vmstate_gicv3_gicd_no_migration_shift_bug = {
.name = "arm_gicv3/gicd_no_migration_shift_bug",
.version_id = 1,
.minimum_version_id = 1,
.pre_load = gicv3_gicd_no_migration_shift_bug_pre_load,
.post_load = gicv3_gicd_no_migration_shift_bug_post_load,
.fields = (VMStateField[]) {
VMSTATE_BOOL(gicd_no_migration_shift_bug, GICv3State),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_gicv3 = {
.name = "arm_gicv3",
.version_id = 1,
@ -165,6 +239,10 @@ static const VMStateDescription vmstate_gicv3 = {
VMSTATE_STRUCT_VARRAY_POINTER_UINT32(cpu, GICv3State, num_cpu,
vmstate_gicv3_cpu, GICv3CPUState),
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription * []) {
&vmstate_gicv3_gicd_no_migration_shift_bug,
NULL
}
};
@ -364,6 +442,7 @@ static void arm_gicv3_common_reset(DeviceState *dev)
gicv3_gicd_group_set(s, i);
}
}
s->gicd_no_migration_shift_bug = true;
}
static void arm_gic_common_linux_init(ARMLinuxBootIf *obj,