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none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1752586249; 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=qDdBMgPeFsba0l0VzAB0puq0dCuMoWTPG49f+ImrdcA=; b=LmdRnlhEs6TXrS+snNhPQYHPcF+kgZ2u3X1P+LE40RH8d7w/IPWOzdynZX4LktCkzywV1s bVsnTLEgf3G9aDTBI7zFT4zmDMKS90Xhz41fVTCv0VxTuSjKzwseEdEyQ/yuQMTeXZJRdX Fwx5jZZeZWDTKYresiqaiqCzkipp5/8= From: Juergen Gross To: minios-devel@lists.xenproject.org, xen-devel@lists.xenproject.org Cc: samuel.thibault@ens-lyon.org, Juergen Gross , Jason Andryuk Subject: [MINI-OS PATCH v2 12/14] gnttab: add function to obtain memory address from grantref Date: Tue, 15 Jul 2025 15:29:34 +0200 Message-ID: <20250715132936.2798-13-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250715132936.2798-1-jgross@suse.com> References: <20250715132936.2798-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spam-Level: X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[amd.com:email,imap1.dmz-prg2.suse.org:helo,suse.com:email,suse.com:mid]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_TLS_ALL(0.00)[] X-Spam-Flag: NO X-Spam-Score: -2.80 X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1752587137608116600 Content-Type: text/plain; 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