| Message ID | 20231213233605.661251-34-iii@linux.ibm.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | kmsan: Enable on s390 | expand |
On Thu, Dec 14, 2023 at 12:37 AM Ilya Leoshkevich <iii@linux.ibm.com> wrote: > > arch_kmsan_get_meta_or_null() finds the lowcore shadow by querying the > prefix and calling kmsan_get_metadata() again. > > kmsan_virt_addr_valid() delegates to virt_addr_valid(). > > Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Alexander Potapenko <glider@google.com>
On Thu, Dec 14, 2023 at 12:24:53AM +0100, Ilya Leoshkevich wrote: > arch_kmsan_get_meta_or_null() finds the lowcore shadow by querying the > prefix and calling kmsan_get_metadata() again. > > kmsan_virt_addr_valid() delegates to virt_addr_valid(). > > Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> > --- > arch/s390/include/asm/kmsan.h | 43 +++++++++++++++++++++++++++++++++++ > 1 file changed, 43 insertions(+) Acked-by: Heiko Carstens <hca@linux.ibm.com>
diff --git a/arch/s390/include/asm/kmsan.h b/arch/s390/include/asm/kmsan.h new file mode 100644 index 000000000000..e572686d340c --- /dev/null +++ b/arch/s390/include/asm/kmsan.h @@ -0,0 +1,43 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_S390_KMSAN_H +#define _ASM_S390_KMSAN_H + +#include <asm/lowcore.h> +#include <asm/page.h> +#include <linux/kmsan.h> +#include <linux/mmzone.h> +#include <linux/stddef.h> + +#ifndef MODULE + +static inline bool is_lowcore_addr(void *addr) +{ + return addr >= (void *)&S390_lowcore && + addr < (void *)(&S390_lowcore + 1); +} + +static inline void *arch_kmsan_get_meta_or_null(void *addr, bool is_origin) +{ + if (is_lowcore_addr(addr)) { + /* + * Different lowcores accessed via S390_lowcore are described + * by the same struct page. Resolve the prefix manually in + * order to get a distinct struct page. + */ + addr += (void *)lowcore_ptr[raw_smp_processor_id()] - + (void *)&S390_lowcore; + if (WARN_ON_ONCE(is_lowcore_addr(addr))) + return NULL; + return kmsan_get_metadata(addr, is_origin); + } + return NULL; +} + +static inline bool kmsan_virt_addr_valid(void *addr) +{ + return virt_addr_valid(addr); +} + +#endif /* !MODULE */ + +#endif /* _ASM_S390_KMSAN_H */
arch_kmsan_get_meta_or_null() finds the lowcore shadow by querying the prefix and calling kmsan_get_metadata() again. kmsan_virt_addr_valid() delegates to virt_addr_valid(). Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> --- arch/s390/include/asm/kmsan.h | 43 +++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 arch/s390/include/asm/kmsan.h