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KVM: Device assignment framework rework

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After discussion with Marcelo, we decided to rework device assignment framework
together. The old problems are kernel logic is unnecessary complex. So Marcelo
suggest to split it into a more elegant way:

1. Split host IRQ assign and guest IRQ assign. And userspace determine the
combination. Also discard msi2intx parameter, userspace can specific
KVM_DEV_IRQ_HOST_MSI | KVM_DEV_IRQ_GUEST_INTX in assigned_irq->flags to
enable MSI to INTx convertion.

2. Split assign IRQ and deassign IRQ. Import two new ioctls:
KVM_ASSIGN_DEV_IRQ and KVM_DEASSIGN_DEV_IRQ.

This patch also fixed the reversed _IOR vs _IOW in definition(by deprecated the
old interface).

[avi: replace homemade bitcount() by hweight_long()]

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Sheng Yang 2009-03-12 21:45:39 +08:00 • committed by Avi Kivity
parent 386eb6e8b3
commit e56d532f20
4 changed files with 283 additions and 249 deletions
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5
include/linux/kvm_host.h
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@ -339,11 +339,6 @@ struct kvm_assigned_dev_kernel {
struct msix_entry *host_msix_entries;
int guest_irq;
struct kvm_guest_msix_entry *guest_msix_entries;
#define KVM_ASSIGNED_DEV_GUEST_INTX (1 << 0)
#define KVM_ASSIGNED_DEV_GUEST_MSI (1 << 1)
#define KVM_ASSIGNED_DEV_HOST_INTX (1 << 8)
#define KVM_ASSIGNED_DEV_HOST_MSI (1 << 9)
#define KVM_ASSIGNED_DEV_MSIX ((1 << 2) | (1 << 10))
unsigned long irq_requested_type;
int irq_source_id;
int flags;