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KVM: arm/arm64: vgic: Don't rely on the wrong pending table 

It's possible that two LPIs locate in the same "byte_offset" but target
two different vcpus, where their pending status are indicated by two
different pending tables.  In such a scenario, using last_byte_offset
optimization will lead KVM relying on the wrong pending table entry.
Let us use last_ptr instead, which can be treated as a byte index into
a pending table and also, can be vcpu specific.

Fixes: 280771252c ("KVM: arm64: vgic-v3: KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES")
Cc: stable@vger.kernel.org
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20191029071919.177-4-yuzenghui@huawei.com
This commit is contained in:
Zenghui Yu 2019-10-29 15:19:19 +08:00 committed by Marc Zyngier
parent bad36e4e8c
commit ca185b2609
1 changed files with 3 additions and 3 deletions
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6
virt/kvm/arm/vgic/vgic-v3.c
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@ -363,8 +363,8 @@ int vgic_v3_lpi_sync_pending_status(struct kvm *kvm, struct vgic_irq *irq)
int vgic_v3_save_pending_tables(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
int last_byte_offset = -1;
struct vgic_irq *irq;
gpa_t last_ptr = ~(gpa_t)0;
int ret;
u8 val;
@ -384,11 +384,11 @@ int vgic_v3_save_pending_tables(struct kvm *kvm)
bit_nr = irq->intid % BITS_PER_BYTE;
ptr = pendbase + byte_offset;
if (byte_offset != last_byte_offset) {
if (ptr != last_ptr) {
ret = kvm_read_guest_lock(kvm, ptr, &val, 1);
if (ret)
return ret;
last_byte_offset = byte_offset;
last_ptr = ptr;
}
stored = val & (1U << bit_nr);