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apic: avoid getting out of halted state on masked PIC interrupts

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After the next patch, if a masked PIC interrupts causes CPU_INTERRUPT_POLL
to be set, the CPU will spuriously get out of halted state.  While this
is technically valid, we should avoid that.

Make CPU_INTERRUPT_POLL run apic_update_irq in the right thread and then
look at CPU_INTERRUPT_HARD.  If CPU_INTERRUPT_HARD does not get set,
do not report the CPU as having work.

Also move the handling of software-disabled APIC from apic_update_irq
to apic_irq_pending, and always trigger CPU_INTERRUPT_POLL.  This will
be important once we will add a case that resets CPU_INTERRUPT_HARD
from apic_update_irq.  We want to run it even if we go through
CPU_INTERRUPT_POLL, and even if the local APIC is software disabled.

Reported-by: Richard Bilson <rbilson@qnx.com>
Tested-by: Richard Bilson <rbilson@qnx.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-11-11 13:14:05 +01:00
parent 0e88f47850
commit 60e68042cf
2 changed files with 13 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
hw/intc/apic.c
View File

@ -349,6 +349,11 @@ static int apic_get_arb_pri(APICCommonState *s)
static int apic_irq_pending(APICCommonState *s)
{
int irrv, ppr;
if (!(s->spurious_vec & APIC_SV_ENABLE)) {
return 0;
}
irrv = get_highest_priority_int(s->irr);
if (irrv < 0) {
return 0;
@ -366,9 +371,6 @@ static void apic_update_irq(APICCommonState *s)
{
CPUState *cpu;
if (!(s->spurious_vec & APIC_SV_ENABLE)) {
return;
}
cpu = CPU(s->cpu);
if (!qemu_cpu_is_self(cpu)) {
cpu_interrupt(cpu, CPU_INTERRUPT_POLL);

10
target-i386/cpu.c
View File

@ -2912,8 +2912,14 @@ static bool x86_cpu_has_work(CPUState *cs)
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
return ((cs->interrupt_request & (CPU_INTERRUPT_HARD |
CPU_INTERRUPT_POLL)) &&
#if !defined(CONFIG_USER_ONLY)
if (cs->interrupt_request & CPU_INTERRUPT_POLL) {
apic_poll_irq(cpu->apic_state);
cpu_reset_interrupt(cs, CPU_INTERRUPT_POLL);
}
#endif
return ((cs->interrupt_request & CPU_INTERRUPT_HARD) &&
(env->eflags & IF_MASK)) ||
(cs->interrupt_request & (CPU_INTERRUPT_NMI |
CPU_INTERRUPT_INIT |