#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "event-parse.h"

#define __HYPERVISOR_set_trap_table			0
#define __HYPERVISOR_mmu_update				1
#define __HYPERVISOR_set_gdt				2
#define __HYPERVISOR_stack_switch			3
#define __HYPERVISOR_set_callbacks			4
#define __HYPERVISOR_fpu_taskswitch			5
#define __HYPERVISOR_sched_op_compat			6
#define __HYPERVISOR_dom0_op				7
#define __HYPERVISOR_set_debugreg			8
#define __HYPERVISOR_get_debugreg			9
#define __HYPERVISOR_update_descriptor			10
#define __HYPERVISOR_memory_op				12
#define __HYPERVISOR_multicall				13
#define __HYPERVISOR_update_va_mapping			14
#define __HYPERVISOR_set_timer_op			15
#define __HYPERVISOR_event_channel_op_compat		16
#define __HYPERVISOR_xen_version			17
#define __HYPERVISOR_console_io				18
#define __HYPERVISOR_physdev_op_compat			19
#define __HYPERVISOR_grant_table_op			20
#define __HYPERVISOR_vm_assist				21
#define __HYPERVISOR_update_va_mapping_otherdomain	22
#define __HYPERVISOR_iret				23 /* x86 only */
#define __HYPERVISOR_vcpu_op				24
#define __HYPERVISOR_set_segment_base			25 /* x86/64 only */
#define __HYPERVISOR_mmuext_op				26
#define __HYPERVISOR_acm_op				27
#define __HYPERVISOR_nmi_op				28
#define __HYPERVISOR_sched_op				29
#define __HYPERVISOR_callback_op			30
#define __HYPERVISOR_xenoprof_op			31
#define __HYPERVISOR_event_channel_op			32
#define __HYPERVISOR_physdev_op				33
#define __HYPERVISOR_hvm_op				34
#define __HYPERVISOR_tmem_op				38

/* Architecture-specific hypercall definitions. */
#define __HYPERVISOR_arch_0				48
#define __HYPERVISOR_arch_1				49
#define __HYPERVISOR_arch_2				50
#define __HYPERVISOR_arch_3				51
#define __HYPERVISOR_arch_4				52
#define __HYPERVISOR_arch_5				53
#define __HYPERVISOR_arch_6				54
#define __HYPERVISOR_arch_7				55

#define N(x)	[__HYPERVISOR_##x] = "("#x")"
static const char *xen_hypercall_names[] = {
	N(set_trap_table),
	N(mmu_update),
	N(set_gdt),
	N(stack_switch),
	N(set_callbacks),
	N(fpu_taskswitch),
	N(sched_op_compat),
	N(dom0_op),
	N(set_debugreg),
	N(get_debugreg),
	N(update_descriptor),
	N(memory_op),
	N(multicall),
	N(update_va_mapping),
	N(set_timer_op),
	N(event_channel_op_compat),
	N(xen_version),
	N(console_io),
	N(physdev_op_compat),
	N(grant_table_op),
	N(vm_assist),
	N(update_va_mapping_otherdomain),
	N(iret),
	N(vcpu_op),
	N(set_segment_base),
	N(mmuext_op),
	N(acm_op),
	N(nmi_op),
	N(sched_op),
	N(callback_op),
	N(xenoprof_op),
	N(event_channel_op),
	N(physdev_op),
	N(hvm_op),

/* Architecture-specific hypercall definitions. */
	N(arch_0),
	N(arch_1),
	N(arch_2),
	N(arch_3),
	N(arch_4),
	N(arch_5),
	N(arch_6),
	N(arch_7),
};
#undef N

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))

static const char *xen_hypercall_name(unsigned op)
{
	if (op < ARRAY_SIZE(xen_hypercall_names) &&
	    xen_hypercall_names[op] != NULL)
		return xen_hypercall_names[op];

	return "";
}

unsigned long long process_xen_hypercall_name(struct trace_seq *s,
					      unsigned long long *args)
{
	unsigned int op = args[0];

	trace_seq_printf(s, "%s", xen_hypercall_name(op));
	return 0;
}

int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
{
	pevent_register_print_function(pevent,
				       process_xen_hypercall_name,
				       PEVENT_FUNC_ARG_STRING,
				       "xen_hypercall_name",
				       PEVENT_FUNC_ARG_INT,
				       PEVENT_FUNC_ARG_VOID);
	return 0;
}

void PEVENT_PLUGIN_UNLOADER(struct pevent *pevent)
{
	pevent_unregister_print_function(pevent, process_xen_hypercall_name,
					 "xen_hypercall_name");
}
'><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>Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;</td><td class='right'>2017-02-01 17:45:02 +0000</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2017-02-01 21:17:49 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/r8a66597.h?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>c8f325a59cfc718d13a50fbc746ed9b415c25e92</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/host/r8a66597.h?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>d53fbdac9d0781e39a13b2ac6b2bd258cf3b4140</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/host/r8a66597.h?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>drivers/usb/host/r8a66597.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/r8a66597.h?id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>bf29bddf0417a4783da3b24e8c9e017ac649326f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/host/r8a66597.h?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92&amp;id2=bf29bddf0417a4783da3b24e8c9e017ac649326f'>diff</a>)</td></tr></table>
<div class='commit-subject'>efi/fdt: Avoid FDT manipulation after ExitBootServices()</div><div class='commit-msg'>Some AArch64 UEFI implementations disable the MMU in ExitBootServices(),
after which unaligned accesses to RAM are no longer supported.

Commit:

  abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel")

fixed an issue in the memory map handling of the stub FDT code, but
inadvertently created an issue with such firmware, by moving some
of the FDT manipulation to after the invocation of ExitBootServices().

Given that the stub's libfdt implementation uses the ordinary, accelerated
string functions, which rely on hardware handling of unaligned accesses,
manipulating the FDT with the MMU off may result in alignment faults.

So fix the situation by moving the update_fdt_memmap() call into the
callback function invoked by efi_exit_boot_services() right before it
calls the ExitBootServices() UEFI service (which is arguably a better
place for it anyway)

Note that disabling the MMU in ExitBootServices() is not compliant with
the UEFI spec, and carries great risk due to the fact that switching from
cached to uncached memory accesses halfway through compiler generated code
(i.e., involving a stack) can never be done in a way that is architecturally
safe.

Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel")
Signed-off-by: Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;
Tested-by: Riku Voipio &lt;riku.voipio@linaro.org&gt;
Cc: &lt;stable@vger.kernel.org&gt;
Cc: mark.rutland@arm.com
Cc: linux-efi@vger.kernel.org
Cc: matt@codeblueprint.co.uk
Cc: leif.lindholm@linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org
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=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>Diffstat</a> (limited to 'drivers/usb/host/r8a66597.h')</div><table summary='diffstat' class='diffstat'>