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KVM: arm/arm64: vgic: GICv2 IGROUPR should read as zero

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We currently don't support grouping in the emulated VGIC, which is a
known defect on KVM (not hurting any currently used guests as far as
we're aware). This is currently handled by treating all interrupts as
group 0 interrupts for an emulated GICv2 and always signaling interrupts
as group 0 to the virtual CPU interface.

However, when reading which group interrupts belongs to in the guest
from the emulated VGIC, the VGIC currently reports group 1 instead of
group 0, which is misleading.  Fix this temporarily before introducing
full group support by changing the hander to _raz instead of _rao.

Fixes: fb848db396 "KVM: arm/arm64: vgic-new: Add GICv2 MMIO handling framework"
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Christoffer Dall 2018-07-16 15:06:20 +02:00 committed by Marc Zyngier
parent aa075b0f30
commit dd6251e463
2 changed files with 8 additions and 2 deletions
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2
virt/kvm/arm/vgic/vgic-init.c
View File

@ -298,7 +298,7 @@ int vgic_init(struct kvm *kvm)
vgic_debug_init(kvm);
dist->implementation_rev = 0;
dist->implementation_rev = 1;
dist->initialized = true;
out:

8
virt/kvm/arm/vgic/vgic-mmio-v2.c
View File

@ -22,6 +22,12 @@
#include "vgic.h"
#include "vgic-mmio.h"
/*
* The Revision field in the IIDR have the following meanings:
*
* Revision 1: Report GICv2 interrupts as group 0 instead of group 1
*/
static unsigned long vgic_mmio_read_v2_misc(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
@ -365,7 +371,7 @@ static const struct vgic_register_region vgic_v2_dist_registers[] = {
vgic_mmio_read_v2_misc, vgic_mmio_write_v2_misc, 12,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_IGROUP,
vgic_mmio_read_rao, vgic_mmio_write_wi, NULL, NULL, 1,
vgic_mmio_read_raz, vgic_mmio_write_wi, NULL, NULL, 1,
VGIC_ACCESS_32bit),
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ENABLE_SET,
vgic_mmio_read_enable, vgic_mmio_write_senable, NULL, NULL, 1,