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Bug-fixes:

Browse source 
- Early bootup issue found on DL380 machines
 - Fix for the timer interrupt not being processed right away.
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Merge tag 'stable/for-linus-3.9-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen

Pull Xen fixes from Konrad Rzeszutek Wilk:
 "Two bug-fixes:
   - Early bootup issue found on DL380 machines
   - Fix for the timer interrupt not being processed right awaym leading
     to quite delayed time skew on certain workloads"

* tag 'stable/for-linus-3.9-rc6-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  xen/mmu: On early bootup, flush the TLB when changing RO->RW bits Xen provided pagetables.
  xen/events: Handle VIRQ_TIMER before any other hardirq in event loop.
This commit is contained in:
Linus Torvalds 2013-04-10 15:57:33 -07:00
commit 722aacb285
2 changed files with 23 additions and 8 deletions
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19
drivers/xen/events.c
View file

@ -1316,7 +1316,7 @@ static void __xen_evtchn_do_upcall(void)
{
int start_word_idx, start_bit_idx;
int word_idx, bit_idx;
int i;
int i, irq;
int cpu = get_cpu();
struct shared_info *s = HYPERVISOR_shared_info;
struct vcpu_info *vcpu_info = __this_cpu_read(xen_vcpu);
@ -1324,6 +1324,8 @@ static void __xen_evtchn_do_upcall(void)
do {
xen_ulong_t pending_words;
xen_ulong_t pending_bits;
struct irq_desc *desc;
vcpu_info->evtchn_upcall_pending = 0;
@ -1335,6 +1337,17 @@ static void __xen_evtchn_do_upcall(void)
* selector flag. xchg_xen_ulong must contain an
* appropriate barrier.
*/
if ((irq = per_cpu(virq_to_irq, cpu)[VIRQ_TIMER]) != -1) {
int evtchn = evtchn_from_irq(irq);
word_idx = evtchn / BITS_PER_LONG;
pending_bits = evtchn % BITS_PER_LONG;
if (active_evtchns(cpu, s, word_idx) & (1ULL << pending_bits)) {
desc = irq_to_desc(irq);
if (desc)
generic_handle_irq_desc(irq, desc);
}
}
pending_words = xchg_xen_ulong(&vcpu_info->evtchn_pending_sel, 0);
start_word_idx = __this_cpu_read(current_word_idx);
@ -1343,7 +1356,6 @@ static void __xen_evtchn_do_upcall(void)
word_idx = start_word_idx;
for (i = 0; pending_words != 0; i++) {
xen_ulong_t pending_bits;
xen_ulong_t words;
words = MASK_LSBS(pending_words, word_idx);
@ -1372,8 +1384,7 @@ static void __xen_evtchn_do_upcall(void)
do {
xen_ulong_t bits;
int port, irq;
struct irq_desc *desc;
int port;
bits = MASK_LSBS(pending_bits, bit_idx);