60 lines
1.9 KiB
Diff
60 lines
1.9 KiB
Diff
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From: Jiri Bohac <jbohac@suse.cz>
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Subject: [PATCH] kexec: dont use kexec_file_load on XEN
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Patch-mainline: 94fbe64fb22d61726ca0c0996987574b6c783c19
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References: bsc#1218590
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Since commit 29fe5067ed07 ("kexec: make -a the default")
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kexec tries the kexec_file_load syscall first and only falls back to kexec_load on
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selected error codes.
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This effectively breaks kexec on XEN, unless -c is pecified to force the kexec_load
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syscall.
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The XEN-specific functions (xen_kexec_load / xen_kexec_unload) are only called
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from my_load / k_unload, i.e. the kexec_load code path.
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With -p (panic kernel) kexec_file_load on XEN fails with -EADDRNOTAVAIL (crash
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kernel reservation is ignored by the kernel on XEN), which is not in the list
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of return codes that cause the fallback to kexec_file.
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Without -p kexec_file_load actualy leads to a kernel oops on v6.4.0
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(needs to be dubugged separately).
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Signed-off-by: Jiri Bohac <jbohac@suse.cz>
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Fixes: 29fe5067ed07 ("kexec: make -a the default")
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---
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kexec/kexec.8 | 1 +
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kexec/kexec.c | 4 ++++
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2 files changed, 5 insertions(+)
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diff --git a/kexec/kexec.8 b/kexec/kexec.8
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index b969cea..9e995fe 100644
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--- a/kexec/kexec.8
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+++ b/kexec/kexec.8
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@@ -162,6 +162,7 @@ Specify that the new kernel is of this
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.TP
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.BI \-s\ (\-\-kexec-file-syscall)
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Specify that the new KEXEC_FILE_LOAD syscall should be used exclusively.
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+Ignored on XEN.
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.TP
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.BI \-c\ (\-\-kexec-syscall)
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Specify that the old KEXEC_LOAD syscall should be used exclusively.
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diff --git a/kexec/kexec.c b/kexec/kexec.c
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index 08edfca..9d0ec46 100644
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--- a/kexec/kexec.c
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+++ b/kexec/kexec.c
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@@ -1685,6 +1685,10 @@ int main(int argc, char *argv[])
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}
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}
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}
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+ if (xen_present()) {
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+ do_kexec_file_syscall = 0;
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+ do_kexec_fallback = 0;
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+ }
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if (do_kexec_file_syscall) {
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if (do_load_jump_back_helper && !do_kexec_fallback)
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die("--load-jump-back-helper not supported with kexec_file_load\n");
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--
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2.43.0
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