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KVM: arm64: Make ICC_*SGI*_EL1 undef in the absence of a vGICv3

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commit 3e6245ebe7 upstream.

On a system with a GICv3, if a guest hasn't been configured with
GICv3 and that the host is not capable of GICv2 emulation,
a write to any of the ICC_*SGI*_EL1 registers is trapped to EL2.

We therefore try to emulate the SGI access, only to hit a NULL
pointer as no private interrupt is allocated (no GIC, remember?).

The obvious fix is to give the guest what it deserves, in the
shape of a UNDEF exception.

Reported-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240820100349.3544850-2-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marc Zyngier 2024-08-20 11:03:38 +01:00 committed by Greg Kroah-Hartman
parent 2d7cb80bff
commit 9d7629bec5
2 changed files with 13 additions and 0 deletions
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6
arch/arm64/kvm/sys_regs.c
View File

@ -32,6 +32,7 @@
#include <trace/events/kvm.h>
#include "sys_regs.h"
#include "vgic/vgic.h"
#include "trace.h"
@ -301,6 +302,11 @@ static bool access_gic_sgi(struct kvm_vcpu *vcpu,
{
bool g1;
if (!kvm_has_gicv3(vcpu->kvm)) {
kvm_inject_undefined(vcpu);
return false;
}
if (!p->is_write)
return read_from_write_only(vcpu, p, r);

7
arch/arm64/kvm/vgic/vgic.h
View File

@ -343,4 +343,11 @@ void vgic_v4_configure_vsgis(struct kvm *kvm);
void vgic_v4_get_vlpi_state(struct vgic_irq *irq, bool *val);
int vgic_v4_request_vpe_irq(struct kvm_vcpu *vcpu, int irq);
static inline bool kvm_has_gicv3(struct kvm *kvm)
{
return (static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif) &&
irqchip_in_kernel(kvm) &&
kvm->arch.vgic.vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3);
}
#endif