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| author | Feng Wu <feng.wu@intel.com> | 2015-05-19 17:07:16 +0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-05-19 15:51:17 +0200 |
| commit | f6b3c72c23661e5534cd2eede16e9bac7ebb761c (patch) | |
| tree | 9a4033e16059ae731bd8fc5420a942b9dcecaadc /arch/x86/kernel/irq.c | |
| parent | a2f1c8bdc02bfcaa5a658283b883fdb54e328b36 (diff) | |
| download | linux-f6b3c72c23661e5534cd2eede16e9bac7ebb761c.tar.bz2 | |
x86/irq: Define a global vector for VT-d Posted-Interrupts
Currently, we use a global vector as the Posted-Interrupts
Notification Event for all the vCPUs in the system. We need
to introduce another global vector for VT-d Posted-Interrtups,
which will be used to wakeup the sleep vCPU when an external
interrupt from a direct-assigned device happens for that vCPU.
[ tglx: Removed a gazillion of extra newlines ]
Signed-off-by: Feng Wu <feng.wu@intel.com>
Cc: jiang.liu@linux.intel.com
Link: http://lkml.kernel.org/r/1432026437-16560-4-git-send-email-feng.wu@intel.com
Suggested-by: Yang Zhang <yang.z.zhang@intel.com>
Acked-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/irq.c')
| -rw-r--r-- | arch/x86/kernel/irq.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c index be3894512820..90b2f7052f5b 100644 --- a/arch/x86/kernel/irq.c +++ b/arch/x86/kernel/irq.c @@ -242,6 +242,18 @@ __visible void smp_x86_platform_ipi(struct pt_regs *regs) } #ifdef CONFIG_HAVE_KVM +static void dummy_handler(void) {} +static void (*kvm_posted_intr_wakeup_handler)(void) = dummy_handler; + +void kvm_set_posted_intr_wakeup_handler(void (*handler)(void)) +{ + if (handler) + kvm_posted_intr_wakeup_handler = handler; + else + kvm_posted_intr_wakeup_handler = dummy_handler; +} +EXPORT_SYMBOL_GPL(kvm_set_posted_intr_wakeup_handler); + /* * Handler for POSTED_INTERRUPT_VECTOR. */ @@ -254,6 +266,20 @@ __visible void smp_kvm_posted_intr_ipi(struct pt_regs *regs) exiting_irq(); set_irq_regs(old_regs); } + +/* + * Handler for POSTED_INTERRUPT_WAKEUP_VECTOR. + */ +__visible void smp_kvm_posted_intr_wakeup_ipi(struct pt_regs *regs) +{ + struct pt_regs *old_regs = set_irq_regs(regs); + + entering_ack_irq(); + inc_irq_stat(kvm_posted_intr_wakeup_ipis); + kvm_posted_intr_wakeup_handler(); + exiting_irq(); + set_irq_regs(old_regs); +} #endif __visible void smp_trace_x86_platform_ipi(struct pt_regs *regs) |