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

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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: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <20250815074052.13792-1-jgross@suse.com>
This commit is contained in:
Juergen Gross 2025-08-15 09:40:52 +02:00
parent 8ea815399c
commit efdaa61d73
1 changed files with 0 additions and 23 deletions
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23
drivers/xen/xenbus/xenbus_xs.c
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@ -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;