Commit efdaa61d authored by Juergen Gross's avatar Juergen Gross
Browse files

drivers/xen/xenbus: remove quirk for Xen 3.x 



The kernel is not supported to run as a Xen guest on Xen versions
older than 4.0.

Remove xen_strict_xenbus_quirk() which is testing the Xen version to be
at least 4.0.

Acked-by: default avatarStefano Stabellini <sstabellini@kernel.org>
Reviewed-by: default avatarJason Andryuk <jason.andryuk@amd.com>
Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Message-ID: <20250815074052.13792-1-jgross@suse.com>
parent 8ea81539

drivers/xen/xenbus/xenbus_xs.c

+0 −23
Original line number Diff line number Diff line
@@ -718,26 +718,6 @@ int xs_watch_msg(struct xs_watch_event *event) 
	return 0;

}



/*

 * Certain older XenBus toolstack cannot handle reading values that are

 * not populated. Some Xen 3.4 installation are incapable of doing this

 * so if we are running on anything older than 4 do not attempt to read

 * control/platform-feature-xs_reset_watches.

 */

static bool xen_strict_xenbus_quirk(void)

{

#ifdef CONFIG_X86

	uint32_t eax, ebx, ecx, edx, base;



	base = xen_cpuid_base();

	cpuid(base + 1, &eax, &ebx, &ecx, &edx);



	if ((eax >> 16) < 4)

		return true;

#endif

	return false;



}

static void xs_reset_watches(void)

{

	int err;
@@ -745,9 +725,6 @@ static void xs_reset_watches(void) 
	if (!xen_hvm_domain() || xen_initial_domain())

		return;



	if (xen_strict_xenbus_quirk())

		return;



	if (!xenbus_read_unsigned("control",

				  "platform-feature-xs_reset_watches", 0))

		return;