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author | Andre Przywara <andre.przywara@arm.com> | 2015-12-01 14:34:02 +0000 |
---|---|---|
committer | Christoffer Dall <christoffer.dall@linaro.org> | 2016-05-20 15:39:53 +0200 |
commit | 055658bf48fcc6afdf90810e7e8f4e98f486c0d2 (patch) | |
tree | b1d8fe657ecbf820c1687ae4316a205e77670b1a /virt | |
parent | 69b6fe0c6e7f560165d655bbb127f8d69b7358ea (diff) | |
download | linux-055658bf48fcc6afdf90810e7e8f4e98f486c0d2.tar.gz linux-055658bf48fcc6afdf90810e7e8f4e98f486c0d2.tar.bz2 linux-055658bf48fcc6afdf90810e7e8f4e98f486c0d2.zip |
KVM: arm/arm64: vgic-new: Add PRIORITY registers handlers
The priority register handlers are shared between the v2 and v3
emulation, so their implementation goes into vgic-mmio.c, to be
easily referenced from the v3 emulation as well later.
There is a corner case when we change the priority of a pending
interrupt which we don't handle at the moment.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt')
-rw-r--r-- | virt/kvm/arm/vgic/vgic-mmio-v2.c | 2 | ||||
-rw-r--r-- | virt/kvm/arm/vgic/vgic-mmio.c | 40 | ||||
-rw-r--r-- | virt/kvm/arm/vgic/vgic-mmio.h | 7 | ||||
-rw-r--r-- | virt/kvm/arm/vgic/vgic.h | 2 |
4 files changed, 50 insertions, 1 deletions
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v2.c b/virt/kvm/arm/vgic/vgic-mmio-v2.c index 12e101b8fd52..d564a3068fcd 100644 --- a/virt/kvm/arm/vgic/vgic-mmio-v2.c +++ b/virt/kvm/arm/vgic/vgic-mmio-v2.c @@ -90,7 +90,7 @@ static const struct vgic_register_region vgic_v2_dist_registers[] = { vgic_mmio_read_active, vgic_mmio_write_cactive, 1, VGIC_ACCESS_32bit), REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PRI, - vgic_mmio_read_raz, vgic_mmio_write_wi, 8, + vgic_mmio_read_priority, vgic_mmio_write_priority, 8, VGIC_ACCESS_32bit | VGIC_ACCESS_8bit), REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_TARGET, vgic_mmio_read_raz, vgic_mmio_write_wi, 8, diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c index 79a4622dad04..6f4e05bada17 100644 --- a/virt/kvm/arm/vgic/vgic-mmio.c +++ b/virt/kvm/arm/vgic/vgic-mmio.c @@ -236,6 +236,46 @@ void vgic_mmio_write_sactive(struct kvm_vcpu *vcpu, } } +unsigned long vgic_mmio_read_priority(struct kvm_vcpu *vcpu, + gpa_t addr, unsigned int len) +{ + u32 intid = VGIC_ADDR_TO_INTID(addr, 8); + int i; + u64 val = 0; + + for (i = 0; i < len; i++) { + struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i); + + val |= (u64)irq->priority << (i * 8); + } + + return val; +} + +/* + * We currently don't handle changing the priority of an interrupt that + * is already pending on a VCPU. If there is a need for this, we would + * need to make this VCPU exit and re-evaluate the priorities, potentially + * leading to this interrupt getting presented now to the guest (if it has + * been masked by the priority mask before). + */ +void vgic_mmio_write_priority(struct kvm_vcpu *vcpu, + gpa_t addr, unsigned int len, + unsigned long val) +{ + u32 intid = VGIC_ADDR_TO_INTID(addr, 8); + int i; + + for (i = 0; i < len; i++) { + struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i); + + spin_lock(&irq->irq_lock); + /* Narrow the priority range to what we actually support */ + irq->priority = (val >> (i * 8)) & GENMASK(7, 8 - VGIC_PRI_BITS); + spin_unlock(&irq->irq_lock); + } +} + static int match_region(const void *key, const void *elt) { const unsigned int offset = (unsigned long)key; diff --git a/virt/kvm/arm/vgic/vgic-mmio.h b/virt/kvm/arm/vgic/vgic-mmio.h index 50b4464a0730..7e73f10bf646 100644 --- a/virt/kvm/arm/vgic/vgic-mmio.h +++ b/virt/kvm/arm/vgic/vgic-mmio.h @@ -129,6 +129,13 @@ void vgic_mmio_write_sactive(struct kvm_vcpu *vcpu, gpa_t addr, unsigned int len, unsigned long val); +unsigned long vgic_mmio_read_priority(struct kvm_vcpu *vcpu, + gpa_t addr, unsigned int len); + +void vgic_mmio_write_priority(struct kvm_vcpu *vcpu, + gpa_t addr, unsigned int len, + unsigned long val); + unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev); #endif diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h index cf620157e1e4..e57f8d54c792 100644 --- a/virt/kvm/arm/vgic/vgic.h +++ b/virt/kvm/arm/vgic/vgic.h @@ -19,6 +19,8 @@ #define PRODUCT_ID_KVM 0x4b /* ASCII code K */ #define IMPLEMENTER_ARM 0x43b +#define VGIC_PRI_BITS 5 + #define vgic_irq_is_sgi(intid) ((intid) < VGIC_NR_SGIS) struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu, |