lkml.org 
[lkml]   [2021]   [Jul]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 1/3] xen: check required Xen features
Date
Linux kernel is not supported to run on Xen versions older than 4.0.

Add tests for required Xen features always being present in Xen 4.0
and newer.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
V2:
- rename macro (Boris Ostrovsky)
- panic() in case of missing feature (Boris Ostrovsky)
---
drivers/xen/features.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/drivers/xen/features.c b/drivers/xen/features.c
index 25c053b09605..7b591443833c 100644
--- a/drivers/xen/features.c
+++ b/drivers/xen/features.c
@@ -9,13 +9,26 @@
#include <linux/types.h>
#include <linux/cache.h>
#include <linux/export.h>
+#include <linux/printk.h>

#include <asm/xen/hypercall.h>

+#include <xen/xen.h>
#include <xen/interface/xen.h>
#include <xen/interface/version.h>
#include <xen/features.h>

+/*
+ * Linux kernel expects at least Xen 4.0.
+ *
+ * Assume some features to be available for that reason (depending on guest
+ * mode, of course).
+ */
+#define chk_required_feature(f) { \
+ if (!xen_feature(f)) \
+ panic("Xen: feature %s not available!\n", #f); \
+ }
+
u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly;
EXPORT_SYMBOL_GPL(xen_features);

@@ -31,4 +44,9 @@ void xen_setup_features(void)
for (j = 0; j < 32; j++)
xen_features[i * 32 + j] = !!(fi.submap & 1<<j);
}
+
+ if (xen_pv_domain()) {
+ chk_required_feature(XENFEAT_mmu_pt_update_preserve_ad);
+ chk_required_feature(XENFEAT_gnttab_map_avail_bits);
+ }
}
--
2.26.2
\
 
 \ /
  Last update: 2021-07-30 09:18    [W:0.045 / U:0.288 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site