kernel/arch/s390/boot/uv.c, branch linux-6.2.y

Merge tag 's390-5.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2022-08-07T00:05:21Z

Pull s390 updates from Alexander Gordeev: - Rework copy_oldmem_page() callback to take an iov_iter. This includes a few prerequisite updates and fixes to the oldmem reading code. - Rework cpufeature implementation to allow for various CPU feature indications, which is not only limited to hardware capabilities, but also allows CPU facilities. - Use the cpufeature rework to autoload Ultravisor module when CPU facility 158 is available. - Add ELF note type for encrypted CPU state of a protected virtual CPU. The zgetdump tool from s390-tools package will decrypt the CPU state using a Customer Communication Key and overwrite respective notes to make the data accessible for crash and other debugging tools. - Use vzalloc() instead of vmalloc() + memset() in ChaCha20 crypto test. - Fix incorrect recovery of kretprobe modified return address in stacktrace. - Switch the NMI handler to use generic irqentry_nmi_enter() and irqentry_nmi_exit() helper functions. - Rework the cryptographic Adjunct Processors (AP) pass-through design to support dynamic changes to the AP matrix of a running guest as well as to implement more of the AP architecture. - Minor boot code cleanups. - Grammar and typo fixes to hmcdrv and tape drivers. * tag 's390-5.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (46 commits) Revert "s390/smp: enforce lowcore protection on CPU restart" Revert "s390/smp: rework absolute lowcore access" Revert "s390/smp,ptdump: add absolute lowcore markers" s390/unwind: fix fgraph return address recovery s390/nmi: use irqentry_nmi_enter()/irqentry_nmi_exit() s390: add ELF note type for encrypted CPU state of a PV VCPU s390/smp,ptdump: add absolute lowcore markers s390/smp: rework absolute lowcore access s390/setup: rearrange absolute lowcore initialization s390/boot: cleanup adjust_to_uv_max() function s390/smp: enforce lowcore protection on CPU restart s390/tape: fix comment typo s390/hmcdrv: fix Kconfig "its" grammar s390/docs: fix warnings for vfio_ap driver doc s390/docs: fix warnings for vfio_ap driver lock usage doc s390/crash: support multi-segment iterators s390/crash: use static swap buffer for copy_to_user_real() s390/crash: move copy_to_user_real() to crash_dump.c s390/zcore: fix race when reading from hardware system area s390/crash: fix incorrect number of bytes to copy to user space ...

s390/boot: cleanup adjust_to_uv_max() function

2022-07-28T16:05:23Z

Uncouple input and output arguments by making the latter the function return value. Reviewed-by: Heiko Carstens Signed-off-by: Alexander Gordeev

s390: Add attestation query information

2022-07-11T09:29:51Z

We have information about the supported attestation header version and plaintext attestation flag bits. Let's expose it via the sysfs files. Signed-off-by: Steffen Eiden Reviewed-by: Claudio Imbrenda Reviewed-by: Janosch Frank Link: https://lore.kernel.org/lkml/20220601100245.3189993-1-seiden@linux.ibm.com/ Signed-off-by: Janosch Frank

s390/uv: Add dump fields to query

2022-06-01T14:57:14Z

The new dump feature requires us to know how much memory is needed for the "dump storage state" and "dump finalize" ultravisor call. These values are reported via the UV query call. Signed-off-by: Janosch Frank Reviewed-by: Claudio Imbrenda Reviewed-by: Steffen Eiden Link: https://lore.kernel.org/r/20220517163629.3443-3-frankja@linux.ibm.com Message-Id: <20220517163629.3443-3-frankja@linux.ibm.com> Signed-off-by: Christian Borntraeger

s390/uv: Add SE hdr query information

2022-06-01T14:57:14Z

We have information about the supported se header version and pcf bits so let's expose it via the sysfs files. Signed-off-by: Janosch Frank Reviewed-by: Claudio Imbrenda Reviewed-by: Steffen Eiden Link: https://lore.kernel.org/r/20220517163629.3443-2-frankja@linux.ibm.com Message-Id: <20220517163629.3443-2-frankja@linux.ibm.com> Signed-off-by: Christian Borntraeger

s390/dump: introduce boot data 'oldmem_data'

2021-07-27T07:39:16Z

The new boot data struct shall replace global variables OLDMEM_BASE and OLDMEM_SIZE. It is initialized in the decompressor and passed to the decompressed kernel. In comparison to the old solution, this one doesn't access data at fixed physical addresses which will become important when the decompressor becomes relocatable. Signed-off-by: Alexander Egorenkov Acked-by: Heiko Carstens Signed-off-by: Heiko Carstens

s390/uv: de-duplicate checks for Protected Host Virtualization

2021-07-27T07:39:14Z

De-duplicate checks for Protected Host Virtualization in decompressor and kernel. Set prot_virt_host=0 in the decompressor in *any* of the following cases and hand it over to the decompressed kernel: * No explicit prot_virt=1 is given on the kernel command-line * Protected Guest Virtualization is enabled * Hardware support not present * kdump or stand-alone dump The decompressed kernel needs to use only is_prot_virt_host() instead of performing again all checks done by the decompressor. Signed-off-by: Alexander Egorenkov Reviewed-by: Vasily Gorbik Signed-off-by: Heiko Carstens

s390/boot: disable Secure Execution in dump mode

2021-07-27T07:39:14Z

A dump kernel is neither required nor able to support Secure Execution. Signed-off-by: Alexander Egorenkov Reviewed-by: Vasily Gorbik Signed-off-by: Heiko Carstens

s390/boot: move uv function declarations to boot/uv.h

2021-07-27T07:39:14Z

The functions adjust_to_uv_max() and uv_query_info() are used only in the decompressor. Therefore, move the function declarations from the global arch/s390/include/asm/uv.h to arch/s390/boot/uv.h. Signed-off-by: Alexander Egorenkov Reviewed-by: Vasily Gorbik Signed-off-by: Heiko Carstens

s390: mm: Fix secure storage access exception handling

2021-07-05T10:44:23Z

Turns out that the bit 61 in the TEID is not always 1 and if that's the case the address space ID and the address are unpredictable. Without an address and its address space ID we can't export memory and hence we can only send a SIGSEGV to the process or panic the kernel depending on who caused the exception. Unfortunately bit 61 is only reliable if we have the "misc" UV feature bit. Signed-off-by: Janosch Frank Reviewed-by: Christian Borntraeger Fixes: 084ea4d611a3d ("s390/mm: add (non)secure page access exceptions handlers") Cc: stable@vger.kernel.org Signed-off-by: Vasily Gorbik