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dkim=pass header.d=suse.com header.s=susede1 header.b="fQ91/Tq1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1751444072; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=54mI4K8Jcav8/UHRZBznVBm2r964lgKK2S2ajy90lfI=; b=fQ91/Tq1HHqJAZXlitD6NTxWGKPPuAPEEk9yW0rDf+nuEHweE0EAuAGuC2V8HRZf5WAWV5 M/xczjTIe2iIXLlinC61i/f0wPUGimKtMh1+pL9vglLC81m712y4AJmAA2HDolJufqlyuL MYs/6LkebIWR+huYNvzaP6iVw1m+yJM= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross Subject: [MINI-OS PATCH 17/19] gnttab: add function to obtain memory address from grantref Date: Wed, 2 Jul 2025 10:12:52 +0200 Message-ID: <20250702081254.14383-18-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250702081254.14383-1-jgross@suse.com> References: <20250702081254.14383-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spamd-Result: default: False [-3.01 / 50.00]; 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charset="utf-8" Add a new function gnttab_get_addr() to obtain a memory pointer for a given grant reference. Signed-off-by: Juergen Gross Reviewed-by: Jason Andryuk --- gnttab.c | 10 ++++++++++ include/gnttab.h | 1 + 2 files changed, 11 insertions(+) diff --git a/gnttab.c b/gnttab.c index 6bac0905..52d6792a 100644 --- a/gnttab.c +++ b/gnttab.c @@ -149,6 +149,16 @@ gnttab_end_transfer(grant_ref_t ref) } EXPORT_SYMBOL(gnttab_end_transfer); =20 +void *gnttab_get_addr(grant_ref_t ref) +{ + BUG_ON(ref >=3D NR_GRANT_ENTRIES || ref < NR_RESERVED_ENTRIES); + + if ( !gnttab_table[ref].flags ) + return NULL; + + return mfn_to_virt(gnttab_table[ref].frame); +} + static const char * const gnttabop_error_msgs[] =3D GNTTABOP_error_msgs; =20 const char * diff --git a/include/gnttab.h b/include/gnttab.h index 108c4425..46e72a36 100644 --- a/include/gnttab.h +++ b/include/gnttab.h @@ -9,6 +9,7 @@ grant_ref_t gnttab_grant_access(domid_t domid, unsigned lon= g frame, grant_ref_t gnttab_grant_transfer(domid_t domid, unsigned long pfn); unsigned long gnttab_end_transfer(grant_ref_t gref); int gnttab_end_access(grant_ref_t ref); +void *gnttab_get_addr(grant_ref_t ref); const char *gnttabop_error(int16_t status); void fini_gnttab(void); void suspend_gnttab(void); --=20 2.43.0