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Thu, 11 Apr 2024 08:24:58 -0700 (PDT) From: Matthew Barnes To: Xen-devel Cc: Matthew Barnes , Andrew Cooper , George Dunlap , Jan Beulich , Julien Grall , Stefano Stabellini Subject: [XEN PATCH 1/2] xen/domctl: Add highest allocated evtchn port to getdomaininfo Date: Thu, 11 Apr 2024 16:24:10 +0100 Message-Id: <55a9cc8fa53e57f898d05463746cbabda821ce25.1712840924.git.matthew.barnes@cloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @cloud.com) X-ZM-MESSAGEID: 1712849116199100002 Content-Type: text/plain; charset="utf-8" For tools such as lsevtchn to enumerate through event channels, they need an upper bound on the port number. Add the highest allocated event channel port number for a domain in the xen_domctl_getdomaininfo struct, and populate it. The field is added above the padding to avoid implicit padding. Signed-off-by: Matthew Barnes --- xen/common/domctl.c | 1 + xen/include/public/domctl.h | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/xen/common/domctl.c b/xen/common/domctl.c index 43b0b074c3a6..1d1ee17f6f91 100644 --- a/xen/common/domctl.c +++ b/xen/common/domctl.c @@ -73,6 +73,7 @@ void getdomaininfo(struct domain *d, struct xen_domctl_ge= tdomaininfo *info) =20 info->domain =3D d->domain_id; info->max_vcpu_id =3D XEN_INVALID_MAX_VCPU_ID; + info->highest_evtchn_port =3D read_atomic(&d->valid_evtchns); =20 /* * - domain is marked as blocked only if all its vcpus are blocked diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h index a33f9ec32b08..d28d29180c75 100644 --- a/xen/include/public/domctl.h +++ b/xen/include/public/domctl.h @@ -145,7 +145,8 @@ struct xen_domctl_getdomaininfo { xen_domain_handle_t handle; uint32_t cpupool; uint8_t gpaddr_bits; /* Guest physical address space size. */ - uint8_t pad2[7]; + uint8_t pad2[3]; + evtchn_port_t highest_evtchn_port; /* Highest allocated event channel = port. Used for enumeration */ struct xen_arch_domainconfig arch_config; }; typedef struct xen_domctl_getdomaininfo xen_domctl_getdomaininfo_t; --=20 2.34.1 From nobody Fri May 17 03:39:41 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=reject dis=none) header.from=cloud.com ARC-Seal: i=1; a=rsa-sha256; t=1712849114; cv=none; d=zohomail.com; s=zohoarc; b=WLLiGZ0gbpaPS04whPO8bD+LBaXXJPPxmGjRA3lGp8vetD8Z1fPdtkeXSsmgokdPHAG2ZJjlVBMg6FXO9TD9t2kWBK2SHcBSTNAEpXMWkOXopun5Ng9F16ZAomdPITJSyoyHvYeZj+EEkukvnrvNX5pmHqWWvNKMyUcJ/7Votlw= ARC-Message-Signature: i=1; a=rsa-sha256; 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charset="utf-8" lsevtchn terminates the loop when the hypercall returns an error, even if there are still event channels with higher port numbers to be enumerated over. Use the highest allocated event channel port number for a given domain to bound the loop so that all relevant event channels can be enumerated over. Signed-off-by: Matthew Barnes --- tools/xcutils/lsevtchn.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/tools/xcutils/lsevtchn.c b/tools/xcutils/lsevtchn.c index d1710613ddc5..7f8ad7c8e7ce 100644 --- a/tools/xcutils/lsevtchn.c +++ b/tools/xcutils/lsevtchn.c @@ -11,6 +11,7 @@ int main(int argc, char **argv) xc_interface *xch; int domid, port, rc; xc_evtchn_status_t status; + xc_domaininfo_t info; =20 domid =3D (argc > 1) ? strtol(argv[1], NULL, 10) : 0; =20 @@ -18,13 +19,16 @@ int main(int argc, char **argv) if ( !xch ) errx(1, "failed to open control interface"); =20 - for ( port =3D 0; ; port++ ) + if ( xc_domain_getinfo_single(xch, domid, &info) < 0 ) + errx(1, "failed to fetch domain info"); + + for ( port =3D 0; port <=3D info.highest_evtchn_port; port++ ) { status.dom =3D domid; status.port =3D port; rc =3D xc_evtchn_status(xch, &status); if ( rc < 0 ) - break; + continue; =20 if ( status.status =3D=3D EVTCHNSTAT_closed ) continue; --=20 2.34.1