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lib: sbi: Add parameter check in sbi_mpxy_set_shmem()

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Shared memory needs to be accessed in M-Mode so for now the high
address of shared memory can't non-zero.

Signed-off-by: Xiang W <wxjstz@126.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20250319123719.504622-1-wxjstz@126.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Xiang W
2025-03-19 20:37:07 +08:00
committed by Anup Patel
parent 0442f1318e
commit ce57cb572e
1 changed files with 14 additions and 0 deletions
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14
lib/sbi/sbi_mpxy.c
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@@ -287,6 +287,20 @@ int sbi_mpxy_set_shmem(unsigned long shmem_phys_lo,
if (shmem_phys_lo & ~PAGE_MASK)
return SBI_ERR_INVALID_PARAM;
/*
* On RV32, the M-mode can only access the first 4GB of
* the physical address space because M-mode does not have
* MMU to access full 34-bit physical address space.
* So fail if the upper 32 bits of the physical address
* is non-zero on RV32.
*
* On RV64, kernel sets upper 64bit address part to zero.
* So fail if the upper 64bit of the physical address
* is non-zero on RV64.
*/
if (shmem_phys_hi)
return SBI_ERR_INVALID_ADDRESS;
if (!sbi_domain_check_addr_range(sbi_domain_thishart_ptr(),
SHMEM_PHYS_ADDR(shmem_phys_hi, shmem_phys_lo),
mpxy_shmem_size, PRV_S,