Revert "xen PVonHVM: use E820_Reserved area for shared_info"

This reverts commit 9d02b43dee0d7fb18dfb13a00915550b1a3daa9f.

We are doing this b/c on 32-bit PVonHVM with older hypervisors
(Xen 4.1) it ends up bothing up the start_info. This is bad b/c
we use it for the time keeping, and the timekeeping code loops
forever - as the version field never changes. Olaf says to
revert it, so lets do that.

Acked-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 5fb3ec1..e014092 100644 (file)
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1517,72 +1517,51 @@ asmlinkage void __init xen_start_kernel(void)
 #endif
 }
 
-#ifdef CONFIG_XEN_PVHVM
-#define HVM_SHARED_INFO_ADDR 0xFE700000UL
-static struct shared_info *xen_hvm_shared_info;
-static unsigned long xen_hvm_sip_phys;
-static int xen_major, xen_minor;
-
-static void xen_hvm_connect_shared_info(unsigned long pfn)
+void __ref xen_hvm_init_shared_info(void)
 {
+       int cpu;
        struct xen_add_to_physmap xatp;
+       static struct shared_info *shared_info_page = 0;
 
+       if (!shared_info_page)
+               shared_info_page = (struct shared_info *)
+                       extend_brk(PAGE_SIZE, PAGE_SIZE);
        xatp.domid = DOMID_SELF;
        xatp.idx = 0;
        xatp.space = XENMAPSPACE_shared_info;
-       xatp.gpfn = pfn;
+       xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
        if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
                BUG();
 
-}
-static void __init xen_hvm_set_shared_info(struct shared_info *sip)
-{
-       int cpu;
-
-       HYPERVISOR_shared_info = sip;
+       HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
 
        /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
         * page, we use it in the event channel upcall and in some pvclock
         * related functions. We don't need the vcpu_info placement
         * optimizations because we don't use any pv_mmu or pv_irq op on
-        * HVM. */
-       for_each_online_cpu(cpu)
+        * HVM.
+        * When xen_hvm_init_shared_info is run at boot time only vcpu 0 is
+        * online but xen_hvm_init_shared_info is run at resume time too and
+        * in that case multiple vcpus might be online. */
+       for_each_online_cpu(cpu) {
                per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
-}
-
-/* Reconnect the shared_info pfn to a (new) mfn */
-void xen_hvm_resume_shared_info(void)
-{
-       xen_hvm_connect_shared_info(xen_hvm_sip_phys >> PAGE_SHIFT);
-}
-
-/* Xen tools prior to Xen 4 do not provide a E820_Reserved area for guest usage.
- * On these old tools the shared info page will be placed in E820_Ram.
- * Xen 4 provides a E820_Reserved area at 0xFC000000, and this code expects
- * that nothing is mapped up to HVM_SHARED_INFO_ADDR.
- * Xen 4.3+ provides an explicit 1MB area at HVM_SHARED_INFO_ADDR which is used
- * here for the shared info page. */
-static void __init xen_hvm_init_shared_info(void)
-{
-       if (xen_major < 4) {
-               xen_hvm_shared_info = extend_brk(PAGE_SIZE, PAGE_SIZE);
-               xen_hvm_sip_phys = __pa(xen_hvm_shared_info);
-       } else {
-               xen_hvm_sip_phys = HVM_SHARED_INFO_ADDR;
-               set_fixmap(FIX_PARAVIRT_BOOTMAP, xen_hvm_sip_phys);
-               xen_hvm_shared_info =
-               (struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
        }
-       xen_hvm_connect_shared_info(xen_hvm_sip_phys >> PAGE_SHIFT);
-       xen_hvm_set_shared_info(xen_hvm_shared_info);
 }
 
+#ifdef CONFIG_XEN_PVHVM
 static void __init init_hvm_pv_info(void)
 {
+       int major, minor;
        uint32_t eax, ebx, ecx, edx, pages, msr, base;
        u64 pfn;
 
        base = xen_cpuid_base();
+       cpuid(base + 1, &eax, &ebx, &ecx, &edx);
+
+       major = eax >> 16;
+       minor = eax & 0xffff;
+       printk(KERN_INFO "Xen version %d.%d.\n", major, minor);
+
        cpuid(base + 2, &pages, &msr, &ecx, &edx);
 
        pfn = __pa(hypercall_page);
@@ -1633,22 +1612,12 @@ static void __init xen_hvm_guest_init(void)
 
 static bool __init xen_hvm_platform(void)
 {
-       uint32_t eax, ebx, ecx, edx, base;
-
        if (xen_pv_domain())
                return false;
 
-       base = xen_cpuid_base();
-       if (!base)
+       if (!xen_cpuid_base())
                return false;
 
-       cpuid(base + 1, &eax, &ebx, &ecx, &edx);
-
-       xen_major = eax >> 16;
-       xen_minor = eax & 0xffff;
-
-       printk(KERN_INFO "Xen version %d.%d.\n", xen_major, xen_minor);
-
        return true;
 }
 

diff --git a/arch/x86/xen/suspend.c b/arch/x86/xen/suspend.c
index ae8a00c..45329c8 100644 (file)
--- a/arch/x86/xen/suspend.c
+++ b/arch/x86/xen/suspend.c
@@ -30,7 +30,7 @@ void xen_arch_hvm_post_suspend(int suspend_cancelled)
 {
 #ifdef CONFIG_XEN_PVHVM
        int cpu;
-       xen_hvm_resume_shared_info();
+       xen_hvm_init_shared_info();
        xen_callback_vector();
        xen_unplug_emulated_devices();
        if (xen_feature(XENFEAT_hvm_safe_pvclock)) {

diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index d2e73d1..a95b417 100644 (file)
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -40,7 +40,7 @@ void xen_enable_syscall(void);
 void xen_vcpu_restore(void);
 
 void xen_callback_vector(void);
-void xen_hvm_resume_shared_info(void);
+void xen_hvm_init_shared_info(void);
 void xen_unplug_emulated_devices(void);
 
 void __init xen_build_dynamic_phys_to_machine(void);