Usually kdump kernel don't need a swiotlb. There are two cases known common case a swiotlb is needed: - SEV/SME is active. - crashkernel high reservation is used, or there are crashkernel memory above 4G. For both case, if swiotlb is set to a large value in first kernel, kdump kernel will likely to fail with OOM. So don't inherit swiotlb parameter by default.

Signed-off-by: Kairui Song <kasong(a)redhat.com&gt; --- kdump.sysconfig | 2 +- kdump.sysconfig.aarch64 | 2 +- kdump.sysconfig.i386 | 2 +- kdump.sysconfig.ppc64 | 2 +- kdump.sysconfig.ppc64le | 2 +- kdump.sysconfig.s390x | 2 +- kdump.sysconfig.x86_64 | 2 +- 7 files changed, 7 insertions(+), 7 deletions(-) diff --git a/kdump.sysconfig b/kdump.sysconfig index df518d6..d8b301c 100644 --- a/kdump.sysconfig +++ b/kdump.sysconfig @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" # This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.aarch64 b/kdump.sysconfig.aarch64 index d5d7624..bcb4a37 100644 --- a/kdump.sysconfig.aarch64 +++ b/kdump.sysconfig.aarch64 @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" # This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.i386 b/kdump.sysconfig.i386 index c31a8cb..650e405 100644 --- a/kdump.sysconfig.i386 +++ b/kdump.sysconfig.i386 @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" # This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.ppc64 b/kdump.sysconfig.ppc64 index 1f95452..03fde14 100644 --- a/kdump.sysconfig.ppc64 +++ b/kdump.sysconfig.ppc64 @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" # This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.ppc64le b/kdump.sysconfig.ppc64le index 1f95452..03fde14 100644 --- a/kdump.sysconfig.ppc64le +++ b/kdump.sysconfig.ppc64le @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" # This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.s390x b/kdump.sysconfig.s390x index abd45a2..6effd6d 100644 --- a/kdump.sysconfig.s390x +++ b/kdump.sysconfig.s390x @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" # This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE diff --git a/kdump.sysconfig.x86_64 b/kdump.sysconfig.x86_64 index a43a970..7b3c68c 100644 --- a/kdump.sysconfig.x86_64 +++ b/kdump.sysconfig.x86_64 @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" # This variable lets us remove arguments from the current kdump commandline # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline # NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" # This variable lets us append arguments to the current kdump commandline # after processed by KDUMP_COMMANDLINE_REMOVE

On 05/17/2020 10:48 PM, Kairui Song wrote: > Usually kdump kernel don't need a swiotlb. There are two cases known > common case a swiotlb is needed: > > - SEV/SME is active. > - crashkernel high reservation is used, or there are crashkernel memory > above 4G. > > For both case, if swiotlb is set to a large value in first kernel, kdump > kernel will likely to fail with OOM. So don't inherit swiotlb parameter > by default. Then is it OK for the two aforementioned cases? Just leave them fixed by user?

Thanks, Pingfan > > Signed-off-by: Kairui Song <kasong(a)redhat.com&gt; > --- > kdump.sysconfig | 2 +- > kdump.sysconfig.aarch64 | 2 +- > kdump.sysconfig.i386 | 2 +- > kdump.sysconfig.ppc64 | 2 +- > kdump.sysconfig.ppc64le | 2 +- > kdump.sysconfig.s390x | 2 +- > kdump.sysconfig.x86_64 | 2 +- > 7 files changed, 7 insertions(+), 7 deletions(-) > > diff --git a/kdump.sysconfig b/kdump.sysconfig > index df518d6..d8b301c 100644 > --- a/kdump.sysconfig > +++ b/kdump.sysconfig > @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" > # This variable lets us remove arguments from the current kdump commandline > # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline > # NOTE: some arguments such as crashkernel will always be removed > -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" > +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" > > # This variable lets us append arguments to the current kdump commandline > # after processed by KDUMP_COMMANDLINE_REMOVE > diff --git a/kdump.sysconfig.aarch64 b/kdump.sysconfig.aarch64 > index d5d7624..bcb4a37 100644 > --- a/kdump.sysconfig.aarch64 > +++ b/kdump.sysconfig.aarch64 > @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" > # This variable lets us remove arguments from the current kdump commandline > # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline > # NOTE: some arguments such as crashkernel will always be removed > -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" > +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" > > # This variable lets us append arguments to the current kdump commandline > # after processed by KDUMP_COMMANDLINE_REMOVE > diff --git a/kdump.sysconfig.i386 b/kdump.sysconfig.i386 > index c31a8cb..650e405 100644 > --- a/kdump.sysconfig.i386 > +++ b/kdump.sysconfig.i386 > @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" > # This variable lets us remove arguments from the current kdump commandline > # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline > # NOTE: some arguments such as crashkernel will always be removed > -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" > +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" > > # This variable lets us append arguments to the current kdump commandline > # after processed by KDUMP_COMMANDLINE_REMOVE > diff --git a/kdump.sysconfig.ppc64 b/kdump.sysconfig.ppc64 > index 1f95452..03fde14 100644 > --- a/kdump.sysconfig.ppc64 > +++ b/kdump.sysconfig.ppc64 > @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" > # This variable lets us remove arguments from the current kdump commandline > # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline > # NOTE: some arguments such as crashkernel will always be removed > -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" > +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" > > # This variable lets us append arguments to the current kdump commandline > # after processed by KDUMP_COMMANDLINE_REMOVE > diff --git a/kdump.sysconfig.ppc64le b/kdump.sysconfig.ppc64le > index 1f95452..03fde14 100644 > --- a/kdump.sysconfig.ppc64le > +++ b/kdump.sysconfig.ppc64le > @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" > # This variable lets us remove arguments from the current kdump commandline > # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline > # NOTE: some arguments such as crashkernel will always be removed > -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" > +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" > > # This variable lets us append arguments to the current kdump commandline > # after processed by KDUMP_COMMANDLINE_REMOVE > diff --git a/kdump.sysconfig.s390x b/kdump.sysconfig.s390x > index abd45a2..6effd6d 100644 > --- a/kdump.sysconfig.s390x > +++ b/kdump.sysconfig.s390x > @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" > # This variable lets us remove arguments from the current kdump commandline > # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline > # NOTE: some arguments such as crashkernel will always be removed > -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" > +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" > > # This variable lets us append arguments to the current kdump commandline > # after processed by KDUMP_COMMANDLINE_REMOVE > diff --git a/kdump.sysconfig.x86_64 b/kdump.sysconfig.x86_64 > index a43a970..7b3c68c 100644 > --- a/kdump.sysconfig.x86_64 > +++ b/kdump.sysconfig.x86_64 > @@ -17,7 +17,7 @@ KDUMP_COMMANDLINE="" > # This variable lets us remove arguments from the current kdump commandline > # as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline > # NOTE: some arguments such as crashkernel will always be removed > -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet" > +KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet swiotlb" > > # This variable lets us append arguments to the current kdump commandline > # after processed by KDUMP_COMMANDLINE_REMOVE > _______________________________________________ kexec mailing list -- kexec(a)lists.fedoraproject.org To unsubscribe send an email to kexec-leave(a)lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/kexec@lists.fedoraproject.org