[Xen-devel] [tip:core/percpu] xen: deal with virtually mapped percpu data

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Commit-ID:  9976b39b5031bbf76f715893cf080b6a17683881
Gitweb:     http://git.kernel.org/tip/9976b39b5031bbf76f715893cf080b6a17683881
Author:     Jeremy Fitzhardinge <jeremy@xxxxxxxx>
AuthorDate: Fri, 27 Feb 2009 09:19:26 -0800
Commit:     Ingo Molnar <mingo@xxxxxxx>
CommitDate: Mon, 2 Mar 2009 12:58:19 +0100

xen: deal with virtually mapped percpu data

The virtually mapped percpu space causes us two problems:

 - for hypercalls which take an mfn, we need to do a full pagetable
   walk to convert the percpu va into an mfn, and

 - when a hypercall requires a page to be mapped RO via all its aliases,
   we need to make sure its RO in both the percpu mapping and in the
   linear mapping

This primarily affects the gdt and the vcpu info structure.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Tejun Heo <htejun@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>


---
 arch/x86/include/asm/xen/page.h |    1 +
 arch/x86/xen/enlighten.c        |   10 ++++++----
 arch/x86/xen/mmu.c              |    7 +++++++
 arch/x86/xen/smp.c              |    6 +++++-
 4 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index 4bd990e..1a918dd 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -164,6 +164,7 @@ static inline pte_t __pte_ma(pteval_t x)
 
 
 xmaddr_t arbitrary_virt_to_machine(void *address);
+unsigned long arbitrary_virt_to_mfn(void *vaddr);
 void make_lowmem_page_readonly(void *vaddr);
 void make_lowmem_page_readwrite(void *vaddr);
 
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 86497d5..352ea68 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -103,7 +103,7 @@ static void xen_vcpu_setup(int cpu)
 
        vcpup = &per_cpu(xen_vcpu_info, cpu);
 
-       info.mfn = virt_to_mfn(vcpup);
+       info.mfn = arbitrary_virt_to_mfn(vcpup);
        info.offset = offset_in_page(vcpup);
 
        printk(KERN_DEBUG "trying to map vcpu_info %d at %p, mfn %llx, offset 
%d\n",
@@ -301,8 +301,10 @@ static void xen_load_gdt(const struct desc_ptr *dtr)
        frames = mcs.args;
 
        for (f = 0; va < dtr->address + size; va += PAGE_SIZE, f++) {
-               frames[f] = virt_to_mfn(va);
+               frames[f] = arbitrary_virt_to_mfn((void *)va);
+
                make_lowmem_page_readonly((void *)va);
+               make_lowmem_page_readonly(mfn_to_virt(frames[f]));
        }
 
        MULTI_set_gdt(mcs.mc, frames, size / sizeof(struct desc_struct));
@@ -314,7 +316,7 @@ static void load_TLS_descriptor(struct thread_struct *t,
                                unsigned int cpu, unsigned int i)
 {
        struct desc_struct *gdt = get_cpu_gdt_table(cpu);
-       xmaddr_t maddr = virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
+       xmaddr_t maddr = arbitrary_virt_to_machine(&gdt[GDT_ENTRY_TLS_MIN+i]);
        struct multicall_space mc = __xen_mc_entry(0);
 
        MULTI_update_descriptor(mc.mc, maddr.maddr, t->tls_array[i]);
@@ -488,7 +490,7 @@ static void xen_write_gdt_entry(struct desc_struct *dt, int 
entry,
                break;
 
        default: {
-               xmaddr_t maddr = virt_to_machine(&dt[entry]);
+               xmaddr_t maddr = arbitrary_virt_to_machine(&dt[entry]);
 
                xen_mc_flush();
                if (HYPERVISOR_update_descriptor(maddr.maddr, *(u64 *)desc))
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 319bd40..cb6afa4 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -276,6 +276,13 @@ void set_phys_to_machine(unsigned long pfn, unsigned long 
mfn)
        p2m_top[topidx][idx] = mfn;
 }
 
+unsigned long arbitrary_virt_to_mfn(void *vaddr)
+{
+       xmaddr_t maddr = arbitrary_virt_to_machine(vaddr);
+
+       return PFN_DOWN(maddr.maddr);
+}
+
 xmaddr_t arbitrary_virt_to_machine(void *vaddr)
 {
        unsigned long address = (unsigned long)vaddr;
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 035582a..8d47056 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -219,6 +219,7 @@ cpu_initialize_context(unsigned int cpu, struct task_struct 
*idle)
 {
        struct vcpu_guest_context *ctxt;
        struct desc_struct *gdt;
+       unsigned long gdt_mfn;
 
        if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
                return 0;
@@ -248,9 +249,12 @@ cpu_initialize_context(unsigned int cpu, struct 
task_struct *idle)
        ctxt->ldt_ents = 0;
 
        BUG_ON((unsigned long)gdt & ~PAGE_MASK);
+
+       gdt_mfn = arbitrary_virt_to_mfn(gdt);
        make_lowmem_page_readonly(gdt);
+       make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
 
-       ctxt->gdt_frames[0] = virt_to_mfn(gdt);
+       ctxt->gdt_frames[0] = gdt_mfn;
        ctxt->gdt_ents      = GDT_ENTRIES;
 
        ctxt->user_regs.cs = __KERNEL_CS;

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