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| author | Marc Zyngier <marc.zyngier@arm.com> | 2013-08-29 11:08:23 +0100 |
|---|---|---|
| committer | Gleb Natapov <gleb@redhat.com> | 2013-08-30 16:12:16 +0300 |
| commit | 6545eae3d7a1b6dc2edb8ede9107998aee1207ef (patch) | |
| tree | c7d47b4095192db5a10f4b3c91937d42c89c88f6 /virt | |
| parent | 986af8e0789a41ac4844e6eefed4a33e86524918 (diff) | |
| download | lwn-6545eae3d7a1b6dc2edb8ede9107998aee1207ef.tar.gz lwn-6545eae3d7a1b6dc2edb8ede9107998aee1207ef.zip | |
ARM: KVM: vgic: fix GICD_ICFGRn access
All the code in handle_mmio_cfg_reg() assumes the offset has
been shifted right to accomodate for the 2:1 bit compression,
but this is only done when getting the register address.
Shift the offset early so the code works mostly unchanged.
Reported-by: Zhaobo (Bob, ERC) <zhaobo@huawei.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/vgic.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c index a2d478aec046..902789ff4abb 100644 --- a/virt/kvm/arm/vgic.c +++ b/virt/kvm/arm/vgic.c @@ -541,8 +541,12 @@ static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu, struct kvm_exit_mmio *mmio, phys_addr_t offset) { u32 val; - u32 *reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg, - vcpu->vcpu_id, offset >> 1); + u32 *reg; + + offset >>= 1; + reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg, + vcpu->vcpu_id, offset); + if (offset & 2) val = *reg >> 16; else |