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Commit 722aacb2 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'stable/for-linus-3.9-rc6-tag' of... 

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.
parents 9baba666 b2222794

arch/x86/xen/mmu.c

+8 −4
Original line number Diff line number Diff line
@@ -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)--;

	}

drivers/xen/events.c

+15 −4
Original line number Diff line number Diff line
@@ -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);