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.

2 files changed, 23 insertions, 8 deletions

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 6afbb2ca9a0a..a4ea92477e01 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1748,14 +1748,18 @@ static void *m2v(phys_addr_t maddr)
 }
 
 /* Set the page permissions on an identity-mapped pages */
-static void set_page_prot(void *addr, pgprot_t prot)
+static void set_page_prot_flags(void *addr, pgprot_t prot, unsigned long flags)
 {
 	unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
 	pte_t pte = pfn_pte(pfn, prot);
 
-	if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, 0))
+	if (HYPERVISOR_update_va_mapping((unsigned long)addr, pte, flags))
 		BUG();
 }
+static void set_page_prot(void *addr, pgprot_t prot)
+{
+	return set_page_prot_flags(addr, prot, UVMF_NONE);
+}
 #ifdef CONFIG_X86_32
 static void __init xen_map_identity_early(pmd_t *pmd, unsigned long max_pfn)
 {
@@ -1839,12 +1843,12 @@ static void __init check_pt_base(unsigned long *pt_base, unsigned long *pt_end,
 				 unsigned long addr)
 {
 	if (*pt_base == PFN_DOWN(__pa(addr))) {
-		set_page_prot((void *)addr, PAGE_KERNEL);
+		set_page_prot_flags((void *)addr, PAGE_KERNEL, UVMF_INVLPG);
 		clear_page((void *)addr);
 		(*pt_base)++;
 	}
 	if (*pt_end == PFN_DOWN(__pa(addr))) {
-		set_page_prot((void *)addr, PAGE_KERNEL);
+		set_page_prot_flags((void *)addr, PAGE_KERNEL, UVMF_INVLPG);
 		clear_page((void *)addr);
 		(*pt_end)--;
 	}
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index aa85881d17b2..2647ad8e1f19 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -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);