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Commit 7b25b9cb authored by Pavel Tatashin's avatar Pavel Tatashin Committed by Thomas Gleixner
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x86/xen/time: Initialize pv xen time in init_hypervisor_platform() 



In every hypervisor except for xen pv time ops are initialized in
init_hypervisor_platform().

Xen PV domains initialize time ops in x86_init.paging.pagetable_init(),
by calling xen_setup_shared_info() which is a poor design, as time is
needed prior to memory allocator.

xen_setup_shared_info() is called from two places: during boot, and
after suspend. Split the content of xen_setup_shared_info() into
three places:

1. add the clock relavent data into new xen pv init_platform vector, and
   set clock ops in there.

2. move xen_setup_vcpu_info_placement() to new xen_pv_guest_late_init()
   call.

3. Re-initializing parts of shared info copy to xen_pv_post_suspend() to
   be symmetric to xen_pv_pre_suspend

Signed-off-by: default avatarPavel Tatashin <pasha.tatashin@oracle.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: steven.sistare@oracle.com
Cc: daniel.m.jordan@oracle.com
Cc: linux@armlinux.org.uk
Cc: schwidefsky@de.ibm.com
Cc: heiko.carstens@de.ibm.com
Cc: john.stultz@linaro.org
Cc: sboyd@codeaurora.org
Cc: hpa@zytor.com
Cc: douly.fnst@cn.fujitsu.com
Cc: peterz@infradead.org
Cc: prarit@redhat.com
Cc: feng.tang@intel.com
Cc: pmladek@suse.com
Cc: gnomes@lxorguk.ukuu.org.uk
Cc: linux-s390@vger.kernel.org
Cc: boris.ostrovsky@oracle.com
Cc: jgross@suse.com
Cc: pbonzini@redhat.com
Link: https://lkml.kernel.org/r/20180719205545.16512-13-pasha.tatashin@oracle.com
parent fe9af81e

arch/x86/xen/enlighten_pv.c

+24 −27
Original line number Diff line number Diff line
@@ -119,6 +119,27 @@ static void __init xen_banner(void) 
	       version >> 16, version & 0xffff, extra.extraversion,

	       xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");

}



static void __init xen_pv_init_platform(void)

{

	set_fixmap(FIX_PARAVIRT_BOOTMAP, xen_start_info->shared_info);

	HYPERVISOR_shared_info = (void *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);



	/* xen clock uses per-cpu vcpu_info, need to init it for boot cpu */

	xen_vcpu_info_reset(0);



	/* pvclock is in shared info area */

	xen_init_time_ops();

}



static void __init xen_pv_guest_late_init(void)

{

#ifndef CONFIG_SMP

	/* Setup shared vcpu info for non-smp configurations */

	xen_setup_vcpu_info_placement();

#endif

}



/* Check if running on Xen version (major, minor) or later */

bool

xen_running_on_version_or_later(unsigned int major, unsigned int minor)
@@ -947,34 +968,8 @@ static void xen_write_msr(unsigned int msr, unsigned low, unsigned high) 
	xen_write_msr_safe(msr, low, high);

}



void xen_setup_shared_info(void)

{

	set_fixmap(FIX_PARAVIRT_BOOTMAP, xen_start_info->shared_info);



	HYPERVISOR_shared_info =

		(struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);



	xen_setup_mfn_list_list();



	if (system_state == SYSTEM_BOOTING) {

#ifndef CONFIG_SMP

		/*

		 * In UP this is as good a place as any to set up shared info.

		 * Limit this to boot only, at restore vcpu setup is done via

		 * xen_vcpu_restore().

		 */

		xen_setup_vcpu_info_placement();

#endif

		/*

		 * Now that shared info is set up we can start using routines

		 * that point to pvclock area.

		 */

		xen_init_time_ops();

	}

}



/* This is called once we have the cpu_possible_mask */

void __ref xen_setup_vcpu_info_placement(void)

void __init xen_setup_vcpu_info_placement(void)

{

	int cpu;
@@ -1228,6 +1223,8 @@ asmlinkage __visible void __init xen_start_kernel(void) 
	x86_init.irqs.intr_mode_init	= x86_init_noop;

	x86_init.oem.arch_setup = xen_arch_setup;

	x86_init.oem.banner = xen_banner;

	x86_init.hyper.init_platform = xen_pv_init_platform;

	x86_init.hyper.guest_late_init = xen_pv_guest_late_init;



	/*

	 * Set up some pagetable state before starting to set any ptes.

arch/x86/xen/mmu_pv.c

+2 −4
Original line number Diff line number Diff line
@@ -1230,8 +1230,7 @@ static void __init xen_pagetable_p2m_free(void) 
	 * We roundup to the PMD, which means that if anybody at this stage is

	 * using the __ka address of xen_start_info or

	 * xen_start_info->shared_info they are in going to crash. Fortunatly

	 * we have already revectored in xen_setup_kernel_pagetable and in

	 * xen_setup_shared_info.

	 * we have already revectored in xen_setup_kernel_pagetable.

	 */

	size = roundup(size, PMD_SIZE);
@@ -1292,8 +1291,7 @@ static void __init xen_pagetable_init(void) 


	/* Remap memory freed due to conflicts with E820 map */

	xen_remap_memory();



	xen_setup_shared_info();

	xen_setup_mfn_list_list();

}

static void xen_write_cr2(unsigned long cr2)

{

arch/x86/xen/suspend_pv.c

+3 −2
Original line number Diff line number Diff line
@@ -27,8 +27,9 @@ void xen_pv_pre_suspend(void) 
void xen_pv_post_suspend(int suspend_cancelled)

{

	xen_build_mfn_list_list();



	xen_setup_shared_info();

	set_fixmap(FIX_PARAVIRT_BOOTMAP, xen_start_info->shared_info);

	HYPERVISOR_shared_info = (void *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);

	xen_setup_mfn_list_list();



	if (suspend_cancelled) {

		xen_start_info->store_mfn =

arch/x86/xen/time.c

+3 −4
Original line number Diff line number Diff line
@@ -40,7 +40,7 @@ static unsigned long xen_tsc_khz(void) 
	return pvclock_tsc_khz(info);

}



u64 xen_clocksource_read(void)

static u64 xen_clocksource_read(void)

{

        struct pvclock_vcpu_time_info *src;

	u64 ret;
@@ -503,7 +503,7 @@ static void __init xen_time_init(void) 
		pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);

}



void __ref xen_init_time_ops(void)

void __init xen_init_time_ops(void)

{

	pv_time_ops = xen_time_ops;
@@ -542,8 +542,7 @@ void __init xen_hvm_init_time_ops(void) 
		return;



	if (!xen_feature(XENFEAT_hvm_safe_pvclock)) {

		printk(KERN_INFO "Xen doesn't support pvclock on HVM,"

				"disable pv timer\n");

		pr_info("Xen doesn't support pvclock on HVM, disable pv timer");

		return;

	}

arch/x86/xen/xen-ops.h

+2 −4
Original line number Diff line number Diff line
@@ -31,7 +31,6 @@ extern struct shared_info xen_dummy_shared_info; 
extern struct shared_info *HYPERVISOR_shared_info;



void xen_setup_mfn_list_list(void);

void xen_setup_shared_info(void);

void xen_build_mfn_list_list(void);

void xen_setup_machphys_mapping(void);

void xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn);
@@ -68,12 +67,11 @@ void xen_init_irq_ops(void); 
void xen_setup_timer(int cpu);

void xen_setup_runstate_info(int cpu);

void xen_teardown_timer(int cpu);

u64 xen_clocksource_read(void);

void xen_setup_cpu_clockevents(void);

void xen_save_time_memory_area(void);

void xen_restore_time_memory_area(void);

void __ref xen_init_time_ops(void);

void __init xen_hvm_init_time_ops(void);

void xen_init_time_ops(void);

void xen_hvm_init_time_ops(void);



irqreturn_t xen_debug_interrupt(int irq, void *dev_id);