--- /dev/null
+From stable+bounces-98547-greg=kroah.com@vger.kernel.org Wed Dec 4 21:23:09 2024
+From: Jing Zhang <jingzhangos@google.com>
+Date: Wed, 4 Dec 2024 12:22:59 -0800
+Subject: KVM: arm64: vgic-its: Add a data length check in vgic_its_save_*
+To: stable@vger.kernel.org
+Cc: Marc Zyngier <maz@kernel.org>, Oliver Upton <oliver.upton@linux.dev>, Kunkun Jiang <jiangkunkun@huawei.com>, Jing Zhang <jingzhangos@google.com>
+Message-ID: <20241204202301.2715933-1-jingzhangos@google.com>
+
+From: Jing Zhang <jingzhangos@google.com>
+
+commit 7fe28d7e68f92cc3d0668b8f2fbdf5c303ac3022 upstream.
+
+In all the vgic_its_save_*() functinos, they do not check whether
+the data length is 8 bytes before calling vgic_write_guest_lock.
+This patch adds the check. To prevent the kernel from being blown up
+when the fault occurs, KVM_BUG_ON() is used. And the other BUG_ON()s
+are replaced together.
+
+Cc: stable@vger.kernel.org
+Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
+[Jing: Update with the new entry read/write helpers]
+Signed-off-by: Jing Zhang <jingzhangos@google.com>
+Link: https://lore.kernel.org/r/20241107214137.428439-4-jingzhangos@google.com
+Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ virt/kvm/arm/vgic/vgic-its.c | 20 ++++++++------------
+ virt/kvm/arm/vgic/vgic.h | 24 ++++++++++++++++++++++++
+ 2 files changed, 32 insertions(+), 12 deletions(-)
+
+--- a/virt/kvm/arm/vgic/vgic-its.c
++++ b/virt/kvm/arm/vgic/vgic-its.c
+@@ -2134,7 +2134,6 @@ static int scan_its_table(struct vgic_it
+ static int vgic_its_save_ite(struct vgic_its *its, struct its_device *dev,
+ struct its_ite *ite, gpa_t gpa, int ite_esz)
+ {
+- struct kvm *kvm = its->dev->kvm;
+ u32 next_offset;
+ u64 val;
+
+@@ -2143,7 +2142,8 @@ static int vgic_its_save_ite(struct vgic
+ ((u64)ite->irq->intid << KVM_ITS_ITE_PINTID_SHIFT) |
+ ite->collection->collection_id;
+ val = cpu_to_le64(val);
+- return kvm_write_guest_lock(kvm, gpa, &val, ite_esz);
++
++ return vgic_its_write_entry_lock(its, gpa, val, ite_esz);
+ }
+
+ /**
+@@ -2279,7 +2279,6 @@ static int vgic_its_restore_itt(struct v
+ static int vgic_its_save_dte(struct vgic_its *its, struct its_device *dev,
+ gpa_t ptr, int dte_esz)
+ {
+- struct kvm *kvm = its->dev->kvm;
+ u64 val, itt_addr_field;
+ u32 next_offset;
+
+@@ -2290,7 +2289,8 @@ static int vgic_its_save_dte(struct vgic
+ (itt_addr_field << KVM_ITS_DTE_ITTADDR_SHIFT) |
+ (dev->num_eventid_bits - 1));
+ val = cpu_to_le64(val);
+- return kvm_write_guest_lock(kvm, ptr, &val, dte_esz);
++
++ return vgic_its_write_entry_lock(its, ptr, val, dte_esz);
+ }
+
+ /**
+@@ -2470,7 +2470,8 @@ static int vgic_its_save_cte(struct vgic
+ ((u64)collection->target_addr << KVM_ITS_CTE_RDBASE_SHIFT) |
+ collection->collection_id);
+ val = cpu_to_le64(val);
+- return kvm_write_guest_lock(its->dev->kvm, gpa, &val, esz);
++
++ return vgic_its_write_entry_lock(its, gpa, val, esz);
+ }
+
+ static int vgic_its_restore_cte(struct vgic_its *its, gpa_t gpa, int esz)
+@@ -2481,8 +2482,7 @@ static int vgic_its_restore_cte(struct v
+ u64 val;
+ int ret;
+
+- BUG_ON(esz > sizeof(val));
+- ret = kvm_read_guest_lock(kvm, gpa, &val, esz);
++ ret = vgic_its_read_entry_lock(its, gpa, &val, esz);
+ if (ret)
+ return ret;
+ val = le64_to_cpu(val);
+@@ -2516,7 +2516,6 @@ static int vgic_its_save_collection_tabl
+ u64 baser = its->baser_coll_table;
+ gpa_t gpa = GITS_BASER_ADDR_48_to_52(baser);
+ struct its_collection *collection;
+- u64 val;
+ size_t max_size, filled = 0;
+ int ret, cte_esz = abi->cte_esz;
+
+@@ -2540,10 +2539,7 @@ static int vgic_its_save_collection_tabl
+ * table is not fully filled, add a last dummy element
+ * with valid bit unset
+ */
+- val = 0;
+- BUG_ON(cte_esz > sizeof(val));
+- ret = kvm_write_guest_lock(its->dev->kvm, gpa, &val, cte_esz);
+- return ret;
++ return vgic_its_write_entry_lock(its, gpa, 0, cte_esz);
+ }
+
+ /**
+--- a/virt/kvm/arm/vgic/vgic.h
++++ b/virt/kvm/arm/vgic/vgic.h
+@@ -6,6 +6,7 @@
+ #define __KVM_ARM_VGIC_NEW_H__
+
+ #include <linux/irqchip/arm-gic-common.h>
++#include <asm/kvm_mmu.h>
+
+ #define PRODUCT_ID_KVM 0x4b /* ASCII code K */
+ #define IMPLEMENTER_ARM 0x43b
+@@ -126,6 +127,29 @@ static inline bool vgic_irq_is_multi_sgi
+ return vgic_irq_get_lr_count(irq) > 1;
+ }
+
++static inline int vgic_its_read_entry_lock(struct vgic_its *its, gpa_t eaddr,
++ u64 *eval, unsigned long esize)
++{
++ struct kvm *kvm = its->dev->kvm;
++
++ if (KVM_BUG_ON(esize != sizeof(*eval), kvm))
++ return -EINVAL;
++
++ return kvm_read_guest_lock(kvm, eaddr, eval, esize);
++
++}
++
++static inline int vgic_its_write_entry_lock(struct vgic_its *its, gpa_t eaddr,
++ u64 eval, unsigned long esize)
++{
++ struct kvm *kvm = its->dev->kvm;
++
++ if (KVM_BUG_ON(esize != sizeof(eval), kvm))
++ return -EINVAL;
++
++ return kvm_write_guest_lock(kvm, eaddr, &eval, esize);
++}
++
+ /*
+ * This struct provides an intermediate representation of the fields contained
+ * in the GICH_VMCR and ICH_VMCR registers, such that code exporting the GIC
--- /dev/null
+From stable+bounces-98548-greg=kroah.com@vger.kernel.org Wed Dec 4 22:39:42 2024
+From: Jing Zhang <jingzhangos@google.com>
+Date: Wed, 4 Dec 2024 12:23:00 -0800
+Subject: KVM: arm64: vgic-its: Clear DTE when MAPD unmaps a device
+To: stable@vger.kernel.org
+Cc: Marc Zyngier <maz@kernel.org>, Oliver Upton <oliver.upton@linux.dev>, Kunkun Jiang <jiangkunkun@huawei.com>, Shusen Li <lishusen2@huawei.com>, Jing Zhang <jingzhangos@google.com>
+Message-ID: <20241204202301.2715933-2-jingzhangos@google.com>
+
+From: Kunkun Jiang <jiangkunkun@huawei.com>
+
+commit e9649129d33dca561305fc590a7c4ba8c3e5675a upstream.
+
+vgic_its_save_device_tables will traverse its->device_list to
+save DTE for each device. vgic_its_restore_device_tables will
+traverse each entry of device table and check if it is valid.
+Restore if valid.
+
+But when MAPD unmaps a device, it does not invalidate the
+corresponding DTE. In the scenario of continuous saves
+and restores, there may be a situation where a device's DTE
+is not saved but is restored. This is unreasonable and may
+cause restore to fail. This patch clears the corresponding
+DTE when MAPD unmaps a device.
+
+Cc: stable@vger.kernel.org
+Fixes: 57a9a117154c ("KVM: arm64: vgic-its: Device table save/restore")
+Co-developed-by: Shusen Li <lishusen2@huawei.com>
+Signed-off-by: Shusen Li <lishusen2@huawei.com>
+Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
+[Jing: Update with entry write helper]
+Signed-off-by: Jing Zhang <jingzhangos@google.com>
+Link: https://lore.kernel.org/r/20241107214137.428439-5-jingzhangos@google.com
+Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ virt/kvm/arm/vgic/vgic-its.c | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+--- a/virt/kvm/arm/vgic/vgic-its.c
++++ b/virt/kvm/arm/vgic/vgic-its.c
+@@ -1181,9 +1181,11 @@ static int vgic_its_cmd_handle_mapd(stru
+ bool valid = its_cmd_get_validbit(its_cmd);
+ u8 num_eventid_bits = its_cmd_get_size(its_cmd);
+ gpa_t itt_addr = its_cmd_get_ittaddr(its_cmd);
++ int dte_esz = vgic_its_get_abi(its)->dte_esz;
+ struct its_device *device;
++ gpa_t gpa;
+
+- if (!vgic_its_check_id(its, its->baser_device_table, device_id, NULL))
++ if (!vgic_its_check_id(its, its->baser_device_table, device_id, &gpa))
+ return E_ITS_MAPD_DEVICE_OOR;
+
+ if (valid && num_eventid_bits > VITS_TYPER_IDBITS)
+@@ -1204,7 +1206,7 @@ static int vgic_its_cmd_handle_mapd(stru
+ * is an error, so we are done in any case.
+ */
+ if (!valid)
+- return 0;
++ return vgic_its_write_entry_lock(its, gpa, 0, dte_esz);
+
+ device = vgic_its_alloc_device(its, device_id, itt_addr,
+ num_eventid_bits);
--- /dev/null
+From stable+bounces-98549-greg=kroah.com@vger.kernel.org Wed Dec 4 21:23:12 2024
+From: Jing Zhang <jingzhangos@google.com>
+Date: Wed, 4 Dec 2024 12:23:01 -0800
+Subject: KVM: arm64: vgic-its: Clear ITE when DISCARD frees an ITE
+To: stable@vger.kernel.org
+Cc: Marc Zyngier <maz@kernel.org>, Oliver Upton <oliver.upton@linux.dev>, Kunkun Jiang <jiangkunkun@huawei.com>, Jing Zhang <jingzhangos@google.com>
+Message-ID: <20241204202301.2715933-3-jingzhangos@google.com>
+
+From: Kunkun Jiang <jiangkunkun@huawei.com>
+
+commit 7602ffd1d5e8927fadd5187cb4aed2fdc9c47143 upstream.
+
+When DISCARD frees an ITE, it does not invalidate the
+corresponding ITE. In the scenario of continuous saves and
+restores, there may be a situation where an ITE is not saved
+but is restored. This is unreasonable and may cause restore
+to fail. This patch clears the corresponding ITE when DISCARD
+frees an ITE.
+
+Cc: stable@vger.kernel.org
+Fixes: eff484e0298d ("KVM: arm64: vgic-its: ITT save and restore")
+Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
+[Jing: Update with entry write helper]
+Signed-off-by: Jing Zhang <jingzhangos@google.com>
+Link: https://lore.kernel.org/r/20241107214137.428439-6-jingzhangos@google.com
+Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ virt/kvm/arm/vgic/vgic-its.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+--- a/virt/kvm/arm/vgic/vgic-its.c
++++ b/virt/kvm/arm/vgic/vgic-its.c
+@@ -854,6 +854,9 @@ static int vgic_its_cmd_handle_discard(s
+
+ ite = find_ite(its, device_id, event_id);
+ if (ite && ite->collection) {
++ struct its_device *device = find_its_device(its, device_id);
++ int ite_esz = vgic_its_get_abi(its)->ite_esz;
++ gpa_t gpa = device->itt_addr + ite->event_id * ite_esz;
+ /*
+ * Though the spec talks about removing the pending state, we
+ * don't bother here since we clear the ITTE anyway and the
+@@ -862,7 +865,8 @@ static int vgic_its_cmd_handle_discard(s
+ vgic_its_invalidate_cache(kvm);
+
+ its_free_ite(kvm, ite);
+- return 0;
++
++ return vgic_its_write_entry_lock(its, gpa, 0, ite_esz);
+ }
+
+ return E_ITS_DISCARD_UNMAPPED_INTERRUPT;
projects / thirdparty / kernel / stable-queue.git / commitdiff
