[Xen-changelog] [linux-2.6.18-xen] blktap2: add tlb flush properly.

["Xen patchbot-linux-2.6.18-xen" <patchbot-linux-2.6.18-xen@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1243501466 -3600
# Node ID a4b49dff3387153b990c95b33eb56a04eeefea33
# Parent  c7c92f868aa15fd352a3469dbc54b2c90b79724f
blktap2: add tlb flush properly.

xen_invlpg() flushes tlb on its cpu, but tlb flush is needed on
all cpus. So replace xen_invlpg() with more proper ones.
Maybe it would be possible to make tlb flush less.
this patch also makes blktap2 compile on ia64 because xen_invlpg()
is x86 specific.

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 drivers/xen/blktap2/device.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff -r c7c92f868aa1 -r a4b49dff3387 drivers/xen/blktap2/device.c
--- a/drivers/xen/blktap2/device.c      Thu May 28 10:00:03 2009 +0100
+++ b/drivers/xen/blktap2/device.c      Thu May 28 10:04:26 2009 +0100
@@ -3,6 +3,7 @@
 #include <linux/cdrom.h>
 #include <linux/hdreg.h>
 #include <linux/module.h>
+#include <asm/tlbflush.h>
 
 #include <scsi/scsi.h>
 #include <scsi/scsi_ioctl.h>
@@ -163,7 +164,6 @@ blktap_map_uaddr_fn(pte_t *ptep, struct 
 
        BTDBG("ptep %p -> %012llx\n", ptep, pte_val(*pte));
        set_pte(ptep, *pte);
-       xen_invlpg(addr);
        return 0;
 }
 
@@ -182,7 +182,6 @@ blktap_umap_uaddr_fn(pte_t *ptep, struct
 
        BTDBG("ptep %p\n", ptep);
        pte_clear(mm, addr, ptep);
-       xen_invlpg(addr);
        return 0;
 }
 
@@ -322,6 +321,7 @@ blktap_unmap(struct blktap *tap, struct 
                if (request->handles[i].kernel == INVALID_GRANT_HANDLE) {
                        kvaddr = request_to_kaddr(request, i);
                        blktap_umap_uaddr(&init_mm, kvaddr);
+                       flush_tlb_kernel_range(kvaddr, kvaddr + PAGE_SIZE);
                        set_phys_to_machine(__pa(kvaddr) >> PAGE_SHIFT,
                                            INVALID_P2M_ENTRY);
                }
@@ -551,7 +551,9 @@ blktap_map(struct blktap *tap,
 
        pte = mk_pte(page, ring->vma->vm_page_prot);
        blktap_map_uaddr(ring->vma->vm_mm, uvaddr, pte_mkwrite(pte));
+       flush_tlb_mm(ring->vma->vm_mm);
        blktap_map_uaddr(&init_mm, kvaddr, mk_pte(page, PAGE_KERNEL));
+       flush_tlb_kernel_range(kvaddr, kvaddr + PAGE_SIZE);
 
        set_phys_to_machine(__pa(kvaddr) >> PAGE_SHIFT, pte_mfn(pte));
        request->handles[seg].kernel = INVALID_GRANT_HANDLE;

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