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KVM: PPC: Enable IRQFD support for the XICS interrupt controller 

This makes it possible to use IRQFDs on platforms that use the XICS
interrupt controller.  To do this we implement kvm_irq_map_gsi() and
kvm_irq_map_chip_pin() in book3s_xics.c, so as to provide a 1-1 mapping
between global interrupt numbers and XICS interrupt source numbers.
For now, all interrupts are mapped as "IRQCHIP" interrupts, and no
MSI support is provided.

This means that kvm_set_irq can now get called with level == 0 or 1
as well as the powerpc-specific values KVM_INTERRUPT_SET,
KVM_INTERRUPT_UNSET and KVM_INTERRUPT_SET_LEVEL.  We change
ics_deliver_irq() to accept all those values, and remove its
report_status argument, as it is always false, given that we don't
support KVM_IRQ_LINE_STATUS.

This also adds support for interrupt ack notifiers to the XICS code
so that the IRQFD resampler functionality can be supported.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Tested-by: Eric Auger <eric.auger@linaro.org>
Tested-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paul Mackerras 2014-06-30 20:51:14 +10:00 committed by Paolo Bonzini
parent 297e21053a
commit 25a2150bee
4 changed files with 55 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/kvm/Kconfig
View File

@ -170,6 +170,8 @@ config KVM_MPIC
config KVM_XICS
bool "KVM in-kernel XICS emulation"
depends on KVM_BOOK3S_64 && !KVM_MPIC
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQFD
---help---
Include support for the XICS (eXternal Interrupt Controller
Specification) interrupt controller architecture used on

5
arch/powerpc/kvm/book3s_hv_rm_xics.c
View File

@ -401,6 +401,11 @@ int kvmppc_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
icp->rm_action |= XICS_RM_REJECT;
icp->rm_reject = irq;
}
if (!hlist_empty(&vcpu->kvm->irq_ack_notifier_list)) {
icp->rm_action |= XICS_RM_NOTIFY_EOI;
icp->rm_eoied_irq = irq;
}
bail:
return check_too_hard(xics, icp);
}

55
arch/powerpc/kvm/book3s_xics.c
View File

@ -64,8 +64,12 @@
static void icp_deliver_irq(struct kvmppc_xics *xics, struct kvmppc_icp *icp,
u32 new_irq);
static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level,
bool report_status)
/*
* Return value ideally indicates how the interrupt was handled, but no
* callers look at it (given that we don't implement KVM_IRQ_LINE_STATUS),
* so just return 0.
*/
static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level)
{
struct ics_irq_state *state;
struct kvmppc_ics *ics;
@ -82,17 +86,14 @@ static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level,
if (!state->exists)
return -EINVAL;
if (report_status)
return state->asserted;
/*
* We set state->asserted locklessly. This should be fine as
* we are the only setter, thus concurrent access is undefined
* to begin with.
*/
if (level == KVM_INTERRUPT_SET_LEVEL)
if (level == 1 || level == KVM_INTERRUPT_SET_LEVEL)
state->asserted = 1;
else if (level == KVM_INTERRUPT_UNSET) {
else if (level == 0 || level == KVM_INTERRUPT_UNSET) {
state->asserted = 0;
return 0;
}
@ -100,7 +101,7 @@ static int ics_deliver_irq(struct kvmppc_xics *xics, u32 irq, u32 level,
/* Attempt delivery */
icp_deliver_irq(xics, NULL, irq);
return state->asserted;
return 0;
}
static void ics_check_resend(struct kvmppc_xics *xics, struct kvmppc_ics *ics,
@ -772,6 +773,8 @@ static noinline int kvmppc_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr)
if (state->asserted)
icp_deliver_irq(xics, icp, irq);
kvm_notify_acked_irq(vcpu->kvm, 0, irq);
return H_SUCCESS;
}
@ -789,6 +792,8 @@ static noinline int kvmppc_xics_rm_complete(struct kvm_vcpu *vcpu, u32 hcall)
icp_check_resend(xics, icp);
if (icp->rm_action & XICS_RM_REJECT)
icp_deliver_irq(xics, icp, icp->rm_reject);
if (icp->rm_action & XICS_RM_NOTIFY_EOI)
kvm_notify_acked_irq(vcpu->kvm, 0, icp->rm_eoied_irq);
icp->rm_action = 0;
@ -1170,7 +1175,16 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
{
struct kvmppc_xics *xics = kvm->arch.xics;
return ics_deliver_irq(xics, irq, level, line_status);
return ics_deliver_irq(xics, irq, level);
}
int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
int irq_source_id, int level, bool line_status)
{
if (!level)
return -1;
return kvm_set_irq(kvm, irq_source_id, irq_entry->gsi,
level, line_status);
}
static int xics_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
@ -1301,3 +1315,26 @@ void kvmppc_xics_free_icp(struct kvm_vcpu *vcpu)
vcpu->arch.icp = NULL;
vcpu->arch.irq_type = KVMPPC_IRQ_DEFAULT;
}
static int xics_set_irq(struct kvm_kernel_irq_routing_entry *e,
struct kvm *kvm, int irq_source_id, int level,
bool line_status)
{
return kvm_set_irq(kvm, irq_source_id, e->gsi, level, line_status);
}
int kvm_irq_map_gsi(struct kvm *kvm,
struct kvm_kernel_irq_routing_entry *entries, int gsi)
{
entries->gsi = gsi;
entries->type = KVM_IRQ_ROUTING_IRQCHIP;
entries->set = xics_set_irq;
entries->irqchip.irqchip = 0;
entries->irqchip.pin = gsi;
return 1;
}
int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin)
{
return pin;
}

2
arch/powerpc/kvm/book3s_xics.h
View File

@ -71,9 +71,11 @@ struct kvmppc_icp {
#define XICS_RM_KICK_VCPU 0x1
#define XICS_RM_CHECK_RESEND 0x2
#define XICS_RM_REJECT 0x4
#define XICS_RM_NOTIFY_EOI 0x8
u32 rm_action;
struct kvm_vcpu *rm_kick_target;
u32 rm_reject;
u32 rm_eoied_irq;
/* Debug stuff for real mode */
union kvmppc_icp_state rm_dbgstate;