/*
 * Xen stolen ticks accounting.
 */
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/math64.h>
#include <linux/gfp.h>

#include <asm/paravirt.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>

#include <xen/events.h>
#include <xen/features.h>
#include <xen/interface/xen.h>
#include <xen/interface/vcpu.h>
#include <xen/xen-ops.h>

/* runstate info updated by Xen */
static DEFINE_PER_CPU(struct vcpu_runstate_info, xen_runstate);

/* return an consistent snapshot of 64-bit time/counter value */
static u64 get64(const u64 *p)
{
	u64 ret;

	if (BITS_PER_LONG < 64) {
		u32 *p32 = (u32 *)p;
		u32 h, l, h2;

		/*
		 * Read high then low, and then make sure high is
		 * still the same; this will only loop if low wraps
		 * and carries into high.
		 * XXX some clean way to make this endian-proof?
		 */
		do {
			h = READ_ONCE(p32[1]);
			l = READ_ONCE(p32[0]);
			h2 = READ_ONCE(p32[1]);
		} while(h2 != h);

		ret = (((u64)h) << 32) | l;
	} else
		ret = READ_ONCE(*p);

	return ret;
}

static void xen_get_runstate_snapshot_cpu(struct vcpu_runstate_info *res,
					  unsigned int cpu)
{
	u64 state_time;
	struct vcpu_runstate_info *state;

	BUG_ON(preemptible());

	state = per_cpu_ptr(&xen_runstate, cpu);

	do {
		state_time = get64(&state->state_entry_time);
		rmb();	/* Hypervisor might update data. */
		*res = READ_ONCE(*state);
		rmb();	/* Hypervisor might update data. */
	} while (get64(&state->state_entry_time) != state_time ||
		 (state_time & XEN_RUNSTATE_UPDATE));
}

/*
 * Runstate accounting
 */
void xen_get_runstate_snapshot(struct vcpu_runstate_info *res)
{
	xen_get_runstate_snapshot_cpu(res, smp_processor_id());
}

/* return true when a vcpu could run but has no real cpu to run on */
bool xen_vcpu_stolen(int vcpu)
{
	return per_cpu(xen_runstate, vcpu).state == RUNSTATE_runnable;
}

u64 xen_steal_clock(int cpu)
{
	struct vcpu_runstate_info state;

	xen_get_runstate_snapshot_cpu(&state, cpu);
	return state.time[RUNSTATE_runnable] + state.time[RUNSTATE_offline];
}

void xen_setup_runstate_info(int cpu)
{
	struct vcpu_register_runstate_memory_area area;

	area.addr.v = &per_cpu(xen_runstate, cpu);

	if (HYPERVISOR_vcpu_op(VCPUOP_register_runstate_memory_area,
			       xen_vcpu_nr(cpu), &area))
		BUG();
}

void __init xen_time_setup_guest(void)
{
	bool xen_runstate_remote;

	xen_runstate_remote = !HYPERVISOR_vm_assist(VMASST_CMD_enable,
					VMASST_TYPE_runstate_update_flag);

	pv_time_ops.steal_clock = xen_steal_clock;

	static_key_slow_inc(&paravirt_steal_enabled);
	if (xen_runstate_remote)
		static_key_slow_inc(&paravirt_steal_rq_enabled);
}
next.git/commit/?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/atm?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>atm</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='b5b46c4740aed1538544f0fa849c5b76c7823469'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Jiri Slaby &lt;jslaby@suse.cz&gt;</td><td class='right'>2017-01-18 14:29:21 +0100</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2017-01-19 08:39:44 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/atm?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>b5b46c4740aed1538544f0fa849c5b76c7823469</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/atm?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>125e7aced4835bad6f6a0c0d02d012f333caf922</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/atm?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>drivers/usb/atm</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/atm?id=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac'>fa19a769f82fb9a5ca000b83cacd13fcaeda51ac</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/atm?id=b5b46c4740aed1538544f0fa849c5b76c7823469&amp;id2=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac'>diff</a>)</td></tr></table>
<div class='commit-subject'>objtool: Fix IRET's opcode</div><div class='commit-msg'>The IRET opcode is 0xcf according to the Intel manual and also to objdump of my
vmlinux:

    1ea8:       48 cf                   iretq

Fix the opcode in arch_decode_instruction().

The previous value (0xc5) seems to correspond to LDS.

Signed-off-by: Jiri Slaby &lt;jslaby@suse.cz&gt;
Acked-by: Josh Poimboeuf &lt;jpoimboe@redhat.com&gt;
Cc: Andy Lutomirski &lt;luto@kernel.org&gt;
Cc: Borislav Petkov &lt;bp@alien8.de&gt;
Cc: Brian Gerst &lt;brgerst@gmail.com&gt;
Cc: Denys Vlasenko &lt;dvlasenk@redhat.com&gt;
Cc: H. Peter Anvin &lt;hpa@zytor.com&gt;
Cc: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Link: http://lkml.kernel.org/r/20170118132921.19319-1-jslaby@suse.cz
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>Diffstat</a> (limited to 'drivers/usb/atm')</div><table summary='diffstat' class='diffstat'>