0e91398f2a
This patch implements Xen save/restore and migration. Saving is triggered via xenbus, which is polled in drivers/xen/manage.c. When a suspend request comes in, the kernel prepares itself for saving by: 1 - Freeze all processes. This is primarily to prevent any partially-completed pagetable updates from confusing the suspend process. If CONFIG_PREEMPT isn't defined, then this isn't necessary. 2 - Suspend xenbus and other devices 3 - Stop_machine, to make sure all the other vcpus are quiescent. The Xen tools require the domain to run its save off vcpu0. 4 - Within the stop_machine state, it pins any unpinned pgds (under construction or destruction), performs canonicalizes various other pieces of state (mostly converting mfns to pfns), and finally 5 - Suspend the domain Restore reverses the steps used to save the domain, ending when all the frozen processes are thawed. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
43 lines
915 B
C
43 lines
915 B
C
#include <linux/types.h>
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#include <xen/interface/xen.h>
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#include <xen/grant_table.h>
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#include <xen/events.h>
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#include <asm/xen/hypercall.h>
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#include <asm/xen/page.h>
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#include "xen-ops.h"
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#include "mmu.h"
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void xen_pre_suspend(void)
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{
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xen_start_info->store_mfn = mfn_to_pfn(xen_start_info->store_mfn);
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xen_start_info->console.domU.mfn =
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mfn_to_pfn(xen_start_info->console.domU.mfn);
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BUG_ON(!irqs_disabled());
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HYPERVISOR_shared_info = &xen_dummy_shared_info;
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if (HYPERVISOR_update_va_mapping(fix_to_virt(FIX_PARAVIRT_BOOTMAP),
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__pte_ma(0), 0))
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BUG();
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}
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void xen_post_suspend(int suspend_cancelled)
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{
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if (suspend_cancelled) {
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xen_start_info->store_mfn =
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pfn_to_mfn(xen_start_info->store_mfn);
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xen_start_info->console.domU.mfn =
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pfn_to_mfn(xen_start_info->console.domU.mfn);
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} else {
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#ifdef CONFIG_SMP
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xen_cpu_initialized_map = cpu_online_map;
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#endif
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}
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xen_setup_shared_info();
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}
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