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xen: check required Xen features

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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>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20210730071804.4302-2-jgross@suse.com
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2021-07-30 09:18:02 +02:00
parent 4b511d5bfa
commit ac4c403c90
1 changed files with 18 additions and 0 deletions
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18
drivers/xen/features.c
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@ -9,13 +9,26 @@
#include <linux/types.h> #include <linux/types.h>
#include <linux/cache.h> #include <linux/cache.h>
#include <linux/export.h> #include <linux/export.h>
#include <linux/printk.h>
#include <asm/xen/hypercall.h> #include <asm/xen/hypercall.h>
#include <xen/xen.h>
#include <xen/interface/xen.h> #include <xen/interface/xen.h>
#include <xen/interface/version.h> #include <xen/interface/version.h>
#include <xen/features.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; u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly;
EXPORT_SYMBOL_GPL(xen_features); EXPORT_SYMBOL_GPL(xen_features);
@ -31,4 +44,9 @@ void xen_setup_features(void)
for (j = 0; j < 32; j++) for (j = 0; j < 32; j++)
xen_features[i * 32 + j] = !!(fi.submap & 1<<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);
}
} }