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powerpc: Give hypervisor decrementer interrupts their own handler

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At the moment the handler for hypervisor decrementer interrupts is
the same as for decrementer interrupts, i.e. timer_interrupt().
This is bogus; if we ever do get a hypervisor decrementer interrupt
it won't have anything to do with the next timer event.  In fact
the only time we get hypervisor decrementer interrupts is when one
is left pending on exit from a KVM guest.

When we get a hypervisor decrementer interrupt we don't need to do
anything special to clear it, since they are edge-triggered on the
transition of HDEC from 0 to -1.  Thus this adds an empty handler
function for them.  We don't need to have them masked when interrupts
are soft-disabled, so we use STD_EXCEPTION_HV instead of
MASKABLE_EXCEPTION_HV.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Paul Mackerras 2012-07-26 13:56:11 +00:00 committed by Benjamin Herrenschmidt
parent 79c5fcebfe
commit dabe859ec6
2 changed files with 11 additions and 1 deletions
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3
arch/powerpc/kernel/exceptions-64s.S
View file

@ -186,7 +186,7 @@ hardware_interrupt_hv:
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800)
MASKABLE_EXCEPTION_PSERIES(0x900, 0x900, decrementer)
MASKABLE_EXCEPTION_HV(0x980, 0x982, decrementer)
STD_EXCEPTION_HV(0x980, 0x982, hdecrementer)
STD_EXCEPTION_PSERIES(0xa00, 0xa00, trap_0a)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00)
@ -486,6 +486,7 @@ machine_check_common:
STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ)
STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, .timer_interrupt)
STD_EXCEPTION_COMMON(0x980, hdecrementer, .hdec_interrupt)
STD_EXCEPTION_COMMON(0xa00, trap_0a, .unknown_exception)
STD_EXCEPTION_COMMON(0xb00, trap_0b, .unknown_exception)
STD_EXCEPTION_COMMON(0xd00, single_step, .single_step_exception)

9
arch/powerpc/kernel/time.c
View file

@ -535,6 +535,15 @@ void timer_interrupt(struct pt_regs * regs)
trace_timer_interrupt_exit(regs);
}
/*
* Hypervisor decrementer interrupts shouldn't occur but are sometimes
* left pending on exit from a KVM guest. We don't need to do anything
* to clear them, as they are edge-triggered.
*/
void hdec_interrupt(struct pt_regs *regs)
{
}
#ifdef CONFIG_SUSPEND
static void generic_suspend_disable_irqs(void)
{