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lib: Handle page/access fault caused by unpriv load/store

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The unpriv load/store instruction from M-mode can cause page/access
fault to M-mode if S-mode page table did not have mappings OR it did
not have PMP access permission.

To tackle this, we redirect trap back to S-mode if unpriv load/store
instruction traps in M-mode.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2019-05-23 13:30:58 +05:30
committed by Anup Patel
parent bb915780ac
commit a6395acd6c
9 changed files with 131 additions and 44 deletions
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11
lib/sbi_ipi.c
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@@ -58,15 +58,18 @@ done:
return 0;
}
int sbi_ipi_send_many(struct sbi_scratch *scratch, ulong *pmask, u32 event,
void *data)
int sbi_ipi_send_many(struct sbi_scratch *scratch, struct unpriv_trap *uptrap,
ulong *pmask, u32 event, void *data)
{
ulong i, m;
ulong mask = sbi_hart_available_mask();
u32 hartid = sbi_current_hartid();
if (pmask)
mask &= load_ulong(pmask);
if (pmask) {
mask &= load_ulong(pmask, scratch, uptrap);
if (uptrap->cause)
return SBI_ETRAP;
}
/* send IPIs to every other hart on the set */
for (i = 0, m = mask; m; i++, m >>= 1)