409771d258
Use xen_vcpuop_clockevent instead of hpet and APIC timers as main clockevent device on all vcpus, use the xen wallclock time as wallclock instead of rtc and use xen_clocksource as clocksource. The pv clock algorithm needs to work correctly for the xen_clocksource and xen wallclock to be usable, only modern Xen versions offer a reliable pv clock in HVM guests (XENFEAT_hvm_safe_pvclock). Using the hpet as clocksource means a VMEXIT every time we read/write to the hpet mmio addresses, pvclock give us a better rating without VMEXITs. Same goes for the xen wallclock and xen_vcpuop_clockevent Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Signed-off-by: Don Dutile <ddutile@redhat.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
#include <linux/types.h>
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#include <linux/clockchips.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 <asm/fixmap.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_hvm_post_suspend(int suspend_cancelled)
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{
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int cpu;
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xen_hvm_init_shared_info();
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xen_callback_vector();
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if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
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for_each_online_cpu(cpu) {
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xen_setup_runstate_info(cpu);
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}
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}
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}
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void xen_post_suspend(int suspend_cancelled)
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{
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xen_build_mfn_list_list();
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xen_setup_shared_info();
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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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BUG_ON(xen_cpu_initialized_map == NULL);
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cpumask_copy(xen_cpu_initialized_map, cpu_online_mask);
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#endif
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xen_vcpu_restore();
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}
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}
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static void xen_vcpu_notify_restore(void *data)
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{
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unsigned long reason = (unsigned long)data;
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/* Boot processor notified via generic timekeeping_resume() */
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if ( smp_processor_id() == 0)
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return;
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clockevents_notify(reason, NULL);
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}
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void xen_arch_resume(void)
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{
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on_each_cpu(xen_vcpu_notify_restore,
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(void *)CLOCK_EVT_NOTIFY_RESUME, 1);
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}
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