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kvm: Decouple 'MSI routing via irqfds' from 'kernel irqchip' 

Decouple another x86-specific assumption about what irqchips imply.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Avi Kivity <avi@redhat.com>
master
Peter Maydell 2012-07-26 15:35:15 +01:00 committed by Avi Kivity
parent cc7e0ddf5a
commit 614e41bc26
5 changed files with 18 additions and 3 deletions
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4
hw/virtio-pci.c
View File

@ -627,7 +627,7 @@ static int virtio_pci_set_guest_notifiers(void *opaque, bool assign)
int r, n;
/* Must unset vector notifier while guest notifier is still assigned */
if (kvm_irqchip_in_kernel() && !assign) {
if (kvm_msi_via_irqfd_enabled() && !assign) {
msix_unset_vector_notifiers(&proxy->pci_dev);
g_free(proxy->vector_irqfd);
proxy->vector_irqfd = NULL;
@ -645,7 +645,7 @@ static int virtio_pci_set_guest_notifiers(void *opaque, bool assign)
}
/* Must set vector notifier after guest notifier has been assigned */
if (kvm_irqchip_in_kernel() && assign) {
if (kvm_msi_via_irqfd_enabled() && assign) {
proxy->vector_irqfd =
g_malloc0(sizeof(*proxy->vector_irqfd) *
msix_nr_vectors_allocated(&proxy->pci_dev));

1
kvm-all.c
View File

@ -102,6 +102,7 @@ KVMState *kvm_state;
bool kvm_kernel_irqchip;
bool kvm_async_interrupts_allowed;
bool kvm_irqfds_allowed;
bool kvm_msi_via_irqfd_allowed;
static const KVMCapabilityInfo kvm_required_capabilites[] = {
KVM_CAP_INFO(USER_MEMORY),

1
kvm-stub.c
View File

@ -21,6 +21,7 @@ KVMState *kvm_state;
bool kvm_kernel_irqchip;
bool kvm_async_interrupts_allowed;
bool kvm_irqfds_allowed;
bool kvm_msi_via_irqfd_allowed;
int kvm_init_vcpu(CPUArchState *env)
{

11
kvm.h
View File

@ -26,6 +26,7 @@ extern int kvm_allowed;
extern bool kvm_kernel_irqchip;
extern bool kvm_async_interrupts_allowed;
extern bool kvm_irqfds_allowed;
extern bool kvm_msi_via_irqfd_allowed;
#if defined CONFIG_KVM || !defined NEED_CPU_H
#define kvm_enabled() (kvm_allowed)
@ -50,11 +51,21 @@ extern bool kvm_irqfds_allowed;
*/
#define kvm_irqfds_enabled() (kvm_irqfds_allowed)
/**
* kvm_msi_via_irqfd_enabled:
*
* Returns: true if we can route a PCI MSI (Message Signaled Interrupt)
* to a KVM CPU via an irqfd. This requires that the kernel supports
* this and that we're running in a configuration that permits it.
*/
#define kvm_msi_via_irqfd_enabled() (kvm_msi_via_irqfd_allowed)
#else
#define kvm_enabled() (0)
#define kvm_irqchip_in_kernel() (false)
#define kvm_async_interrupts_enabled() (false)
#define kvm_irqfds_enabled() (false)
#define kvm_msi_via_irqfd_enabled() (false)
#endif
struct kvm_run;

4
target-i386/kvm.c
View File

@ -2048,7 +2048,9 @@ void kvm_arch_init_irq_routing(KVMState *s)
no_hpet = 1;
}
/* We know at this point that we're using the in-kernel
* irqchip, so we can use irqfds.
* irqchip, so we can use irqfds, and on x86 we know
* we can use msi via irqfd.
*/
kvm_irqfds_allowed = true;
kvm_msi_via_irqfd_allowed = true;
}