From 457a86a0ebe6a5544aa4f2ee7a2af5c125b9fb1b Mon Sep 17 00:00:00 2001 From: Ralf Ramsauer Date: Sat, 23 Apr 2022 23:59:07 +0200 Subject: target/riscv: Fix incorrect PTE merge in walk_pte Two non-subsequent PTEs can be mapped to subsequent paddrs. In this case, walk_pte will erroneously merge them. Enforce the split up, by tracking the virtual base address. Let's say we have the mapping: 0x81200000 -> 0x89623000 (4K) 0x8120f000 -> 0x89624000 (4K) Before, walk_pte would have shown: vaddr paddr size attr ---------------- ---------------- ---------------- ------- 0000000081200000 0000000089623000 0000000000002000 rwxu-ad as it only checks for subsequent paddrs. With this patch, it becomes: vaddr paddr size attr ---------------- ---------------- ---------------- ------- 0000000081200000 0000000089623000 0000000000001000 rwxu-ad 000000008120f000 0000000089624000 0000000000001000 rwxu-ad Signed-off-by: Ralf Ramsauer Reviewed-by: Bin Meng Reviewed-by: Alistair Francis Message-Id: <20220423215907.673663-1-ralf.ramsauer@oth-regensburg.de> Signed-off-by: Alistair Francis --- target/riscv/monitor.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) (limited to 'target') diff --git a/target/riscv/monitor.c b/target/riscv/monitor.c index 7efb4b6..17e63fa 100644 --- a/target/riscv/monitor.c +++ b/target/riscv/monitor.c @@ -84,6 +84,7 @@ static void walk_pte(Monitor *mon, hwaddr base, target_ulong start, { hwaddr pte_addr; hwaddr paddr; + target_ulong last_start = -1; target_ulong pgsize; target_ulong pte; int ptshift; @@ -111,12 +112,13 @@ static void walk_pte(Monitor *mon, hwaddr base, target_ulong start, * A leaf PTE has been found * * If current PTE's permission bits differ from the last one, - * or current PTE's ppn does not make a contiguous physical - * address block together with the last one, print out the last - * contiguous mapped block details. + * or the current PTE breaks up a contiguous virtual or + * physical mapping, address block together with the last one, + * print out the last contiguous mapped block details. */ if ((*last_attr != attr) || - (*last_paddr + *last_size != paddr)) { + (*last_paddr + *last_size != paddr) || + (last_start + *last_size != start)) { print_pte(mon, va_bits, *vbase, *pbase, *last_paddr + *last_size - *pbase, *last_attr); @@ -125,6 +127,7 @@ static void walk_pte(Monitor *mon, hwaddr base, target_ulong start, *last_attr = attr; } + last_start = start; *last_paddr = paddr; *last_size = pgsize; } else { -- cgit v1.1