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Re: [PATCH v2] target/ppc: fix Hash64 MMU update of PTE bit R
From: |
David Gibson |
Subject: |
Re: [PATCH v2] target/ppc: fix Hash64 MMU update of PTE bit R |
Date: |
Fri, 26 Nov 2021 12:13:02 +1100 |
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.lupori@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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