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Wed, 29 May 2024 00:26:07 -0700 (PDT) From: Jens Wiklander To: xen-devel@lists.xenproject.org Cc: patches@linaro.org, Jens Wiklander , Volodymyr Babchuk , Stefano Stabellini , Julien Grall , Bertrand Marquis , Michal Orzel Subject: [XEN PATCH v5 3/7] xen/arm: ffa: simplify ffa_handle_mem_share() Date: Wed, 29 May 2024 09:25:55 +0200 Message-Id: <20240529072559.2486986-4-jens.wiklander@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240529072559.2486986-1-jens.wiklander@linaro.org> References: <20240529072559.2486986-1-jens.wiklander@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1716967588553100001 Content-Type: text/plain; charset="utf-8" Simplify ffa_handle_mem_share() by removing the start_page_idx and last_page_idx parameters from get_shm_pages() and check that the number of pages matches expectations at the end of get_shm_pages(). Signed-off-by: Jens Wiklander Reviewed-by: Bertrand Marquis --- xen/arch/arm/tee/ffa_shm.c | 18 ++++++------------ 1 file changed, 6 insertions(+), 12 deletions(-) diff --git a/xen/arch/arm/tee/ffa_shm.c b/xen/arch/arm/tee/ffa_shm.c index 75a5b66aeb4c..370d83ec5cf8 100644 --- a/xen/arch/arm/tee/ffa_shm.c +++ b/xen/arch/arm/tee/ffa_shm.c @@ -159,10 +159,9 @@ static int32_t ffa_mem_reclaim(uint32_t handle_lo, uin= t32_t handle_hi, */ static int get_shm_pages(struct domain *d, struct ffa_shm_mem *shm, const struct ffa_address_range *range, - uint32_t range_count, unsigned int start_page_idx, - unsigned int *last_page_idx) + uint32_t range_count) { - unsigned int pg_idx =3D start_page_idx; + unsigned int pg_idx =3D 0; gfn_t gfn; unsigned int n; unsigned int m; @@ -191,7 +190,9 @@ static int get_shm_pages(struct domain *d, struct ffa_s= hm_mem *shm, } } =20 - *last_page_idx =3D pg_idx; + /* The ranges must add up */ + if ( pg_idx < shm->page_count ) + return FFA_RET_INVALID_PARAMETERS; =20 return FFA_RET_OK; } @@ -460,7 +461,6 @@ void ffa_handle_mem_share(struct cpu_user_regs *regs) struct domain *d =3D current->domain; struct ffa_ctx *ctx =3D d->arch.tee; struct ffa_shm_mem *shm =3D NULL; - unsigned int last_page_idx =3D 0; register_t handle_hi =3D 0; register_t handle_lo =3D 0; int ret =3D FFA_RET_DENIED; @@ -570,15 +570,9 @@ void ffa_handle_mem_share(struct cpu_user_regs *regs) goto out; } =20 - ret =3D get_shm_pages(d, shm, region_descr->address_range_array, range= _count, - 0, &last_page_idx); + ret =3D get_shm_pages(d, shm, region_descr->address_range_array, range= _count); if ( ret ) goto out; - if ( last_page_idx !=3D shm->page_count ) - { - ret =3D FFA_RET_INVALID_PARAMETERS; - goto out; - } =20 /* Note that share_shm() uses our tx buffer */ spin_lock(&ffa_tx_buffer_lock); --=20 2.34.1