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path: root/virt/kvm/arm/vgic/vgic-its.c
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Diffstat (limited to 'virt/kvm/arm/vgic/vgic-its.c')
-rw-r--r--virt/kvm/arm/vgic/vgic-its.c73
1 files changed, 48 insertions, 25 deletions
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index f51c1e1b3f70..547f12dc4d54 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -1466,6 +1466,16 @@ static void vgic_mmio_write_its_ctlr(struct kvm *kvm, struct vgic_its *its,
{
mutex_lock(&its->cmd_lock);
+ /*
+ * It is UNPREDICTABLE to enable the ITS if any of the CBASER or
+ * device/collection BASER are invalid
+ */
+ if (!its->enabled && (val & GITS_CTLR_ENABLE) &&
+ (!(its->baser_device_table & GITS_BASER_VALID) ||
+ !(its->baser_coll_table & GITS_BASER_VALID) ||
+ !(its->cbaser & GITS_CBASER_VALID)))
+ goto out;
+
its->enabled = !!(val & GITS_CTLR_ENABLE);
/*
@@ -1474,6 +1484,7 @@ static void vgic_mmio_write_its_ctlr(struct kvm *kvm, struct vgic_its *its,
*/
vgic_its_process_commands(kvm, its);
+out:
mutex_unlock(&its->cmd_lock);
}
@@ -1801,37 +1812,33 @@ typedef int (*entry_fn_t)(struct vgic_its *its, u32 id, void *entry,
static int scan_its_table(struct vgic_its *its, gpa_t base, int size, int esz,
int start_id, entry_fn_t fn, void *opaque)
{
- void *entry = kzalloc(esz, GFP_KERNEL);
struct kvm *kvm = its->dev->kvm;
unsigned long len = size;
int id = start_id;
gpa_t gpa = base;
+ char entry[esz];
int ret;
+ memset(entry, 0, esz);
+
while (len > 0) {
int next_offset;
size_t byte_offset;
ret = kvm_read_guest(kvm, gpa, entry, esz);
if (ret)
- goto out;
+ return ret;
next_offset = fn(its, id, entry, opaque);
- if (next_offset <= 0) {
- ret = next_offset;
- goto out;
- }
+ if (next_offset <= 0)
+ return next_offset;
byte_offset = next_offset * esz;
id += next_offset;
gpa += byte_offset;
len -= byte_offset;
}
- ret = 1;
-
-out:
- kfree(entry);
- return ret;
+ return 1;
}
/**
@@ -1940,6 +1947,14 @@ static int vgic_its_save_itt(struct vgic_its *its, struct its_device *device)
return 0;
}
+/**
+ * vgic_its_restore_itt - restore the ITT of a device
+ *
+ * @its: its handle
+ * @dev: device handle
+ *
+ * Return 0 on success, < 0 on error
+ */
static int vgic_its_restore_itt(struct vgic_its *its, struct its_device *dev)
{
const struct vgic_its_abi *abi = vgic_its_get_abi(its);
@@ -1951,6 +1966,10 @@ static int vgic_its_restore_itt(struct vgic_its *its, struct its_device *dev)
ret = scan_its_table(its, base, max_size, ite_esz, 0,
vgic_its_restore_ite, dev);
+ /* scan_its_table returns +1 if all ITEs are invalid */
+ if (ret > 0)
+ ret = 0;
+
return ret;
}
@@ -2048,11 +2067,12 @@ static int vgic_its_device_cmp(void *priv, struct list_head *a,
static int vgic_its_save_device_tables(struct vgic_its *its)
{
const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+ u64 baser = its->baser_device_table;
struct its_device *dev;
int dte_esz = abi->dte_esz;
- u64 baser;
- baser = its->baser_device_table;
+ if (!(baser & GITS_BASER_VALID))
+ return 0;
list_sort(NULL, &its->device_list, vgic_its_device_cmp);
@@ -2107,10 +2127,7 @@ static int handle_l1_dte(struct vgic_its *its, u32 id, void *addr,
ret = scan_its_table(its, gpa, SZ_64K, dte_esz,
l2_start_id, vgic_its_restore_dte, NULL);
- if (ret <= 0)
- return ret;
-
- return 1;
+ return ret;
}
/**
@@ -2140,8 +2157,9 @@ static int vgic_its_restore_device_tables(struct vgic_its *its)
vgic_its_restore_dte, NULL);
}
+ /* scan_its_table returns +1 if all entries are invalid */
if (ret > 0)
- ret = -EINVAL;
+ ret = 0;
return ret;
}
@@ -2198,17 +2216,17 @@ static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz)
static int vgic_its_save_collection_table(struct vgic_its *its)
{
const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+ u64 baser = its->baser_coll_table;
+ gpa_t gpa = BASER_ADDRESS(baser);
struct its_collection *collection;
u64 val;
- gpa_t gpa;
size_t max_size, filled = 0;
int ret, cte_esz = abi->cte_esz;
- gpa = BASER_ADDRESS(its->baser_coll_table);
- if (!gpa)
+ if (!(baser & GITS_BASER_VALID))
return 0;
- max_size = GITS_BASER_NR_PAGES(its->baser_coll_table) * SZ_64K;
+ max_size = GITS_BASER_NR_PAGES(baser) * SZ_64K;
list_for_each_entry(collection, &its->collection_list, coll_list) {
ret = vgic_its_save_cte(its, collection, gpa, cte_esz);
@@ -2239,17 +2257,18 @@ static int vgic_its_save_collection_table(struct vgic_its *its)
static int vgic_its_restore_collection_table(struct vgic_its *its)
{
const struct vgic_its_abi *abi = vgic_its_get_abi(its);
+ u64 baser = its->baser_coll_table;
int cte_esz = abi->cte_esz;
size_t max_size, read = 0;
gpa_t gpa;
int ret;
- if (!(its->baser_coll_table & GITS_BASER_VALID))
+ if (!(baser & GITS_BASER_VALID))
return 0;
- gpa = BASER_ADDRESS(its->baser_coll_table);
+ gpa = BASER_ADDRESS(baser);
- max_size = GITS_BASER_NR_PAGES(its->baser_coll_table) * SZ_64K;
+ max_size = GITS_BASER_NR_PAGES(baser) * SZ_64K;
while (read < max_size) {
ret = vgic_its_restore_cte(its, gpa, cte_esz);
@@ -2258,6 +2277,10 @@ static int vgic_its_restore_collection_table(struct vgic_its *its)
gpa += cte_esz;
read += cte_esz;
}
+
+ if (ret > 0)
+ return 0;
+
return ret;
}