On Thu, Nov 25, 2021 at 03:33:22PM -0300, 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>
If you're introducing the constant, it would make sense to also use it in spapr_hpte_set_r(). > --- > 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 -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson
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