On 11/25/21 15:33, Leandro Lupori wrote:
When updating the R bit of a PTE, the Hash64 MMU was using a wrong byte
offset, causing the first byte of the adjacent PTE to be corrupted.
This caused a panic when booting FreeBSD, using the Hash MMU.
Fixes: a2dd4e83e76b ("ppc/hash64: Rework R and C bit updates")
Signed-off-by: Leandro Lupori <leandro.lup...@eldorado.org.br>
---
Reviewed-by: Daniel Henrique Barboza <danielhb...@gmail.com>
Changes from v1:
- Add and use a new define for the byte offset of PTE bit R
---
target/ppc/mmu-hash64.c | 2 +-
target/ppc/mmu-hash64.h | 3 +++
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/target/ppc/mmu-hash64.c b/target/ppc/mmu-hash64.c
index 19832c4b46..0968927744 100644
--- a/target/ppc/mmu-hash64.c
+++ b/target/ppc/mmu-hash64.c
@@ -786,7 +786,7 @@ static void ppc_hash64_set_dsi(CPUState *cs, int mmu_idx,
uint64_t dar, uint64_t
static void ppc_hash64_set_r(PowerPCCPU *cpu, hwaddr ptex, uint64_t pte1)
{
- hwaddr base, offset = ptex * HASH_PTE_SIZE_64 + 16;
+ hwaddr base, offset = ptex * HASH_PTE_SIZE_64 + HPTE64_R_R_BYTE_OFFSET;
if (cpu->vhyp) {
PPCVirtualHypervisorClass *vhc =
diff --git a/target/ppc/mmu-hash64.h b/target/ppc/mmu-hash64.h
index c5b2f97ff7..40bb901262 100644
--- a/target/ppc/mmu-hash64.h
+++ b/target/ppc/mmu-hash64.h
@@ -97,6 +97,9 @@ void ppc_hash64_finalize(PowerPCCPU *cpu);
#define HPTE64_V_1TB_SEG 0x4000000000000000ULL
#define HPTE64_V_VRMA_MASK 0x4001ffffff000000ULL
+/* PTE byte offsets */
+#define HPTE64_R_R_BYTE_OFFSET 14
+
/* Format changes for ARCH v3 */
#define HPTE64_V_COMMON_BITS 0x000fffffffffffffULL
#define HPTE64_R_3_0_SSIZE_SHIFT 58