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KVM: arm/arm64: vgic-its: Free caches when GITS_BASER Valid bit is cleared

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When the GITS_BASER<n>.Valid gets cleared, the data structures in
guest RAM are not valid anymore. The device, collection
and LPI lists stored in the in-kernel ITS represent the same
information in some form of cache. So let's void the cache.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Eric Auger 2017-10-26 17:23:09 +02:00 committed by Christoffer Dall
parent 2f609a0339
commit 36d6961c2b
1 changed files with 18 additions and 4 deletions
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22
virt/kvm/arm/vgic/vgic-its.c
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@ -1431,7 +1431,7 @@ static void vgic_mmio_write_its_baser(struct kvm *kvm,
unsigned long val)
{
const struct vgic_its_abi *abi = vgic_its_get_abi(its);
u64 entry_size, device_type;
u64 entry_size, table_type;
u64 reg, *regptr, clearbits = 0;
/* When GITS_CTLR.Enable is 1, we ignore write accesses. */
@ -1442,12 +1442,12 @@ static void vgic_mmio_write_its_baser(struct kvm *kvm,
case 0:
regptr = &its->baser_device_table;
entry_size = abi->dte_esz;
device_type = GITS_BASER_TYPE_DEVICE;
table_type = GITS_BASER_TYPE_DEVICE;
break;
case 1:
regptr = &its->baser_coll_table;
entry_size = abi->cte_esz;
device_type = GITS_BASER_TYPE_COLLECTION;
table_type = GITS_BASER_TYPE_COLLECTION;
clearbits = GITS_BASER_INDIRECT;
break;
default:
@ -1459,10 +1459,24 @@ static void vgic_mmio_write_its_baser(struct kvm *kvm,
reg &= ~clearbits;
reg |= (entry_size - 1) << GITS_BASER_ENTRY_SIZE_SHIFT;
reg |= device_type << GITS_BASER_TYPE_SHIFT;
reg |= table_type << GITS_BASER_TYPE_SHIFT;
reg = vgic_sanitise_its_baser(reg);
*regptr = reg;
if (!(reg & GITS_BASER_VALID)) {
/* Take the its_lock to prevent a race with a save/restore */
mutex_lock(&its->its_lock);
switch (table_type) {
case GITS_BASER_TYPE_DEVICE:
vgic_its_free_device_list(kvm, its);
break;
case GITS_BASER_TYPE_COLLECTION:
vgic_its_free_collection_list(kvm, its);
break;
}
mutex_unlock(&its->its_lock);
}
}
static unsigned long vgic_mmio_read_its_ctlr(struct kvm *vcpu,