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Tue, 26 Nov 2024 23:21:56 +0000 (UTC) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 4019797e-ac4d-11ef-99a3-01e77a169b0f X-Custom-Connection: eyJyZW1vdGVpcCI6IjEzOS4xNzguODQuMjE3IiwiaGVsbyI6ImRmdy5zb3VyY2Uua2VybmVsLm9yZyJ9 X-Custom-Transaction: eyJpZCI6IjQwMTk3OTdlLWFjNGQtMTFlZi05OWEzLTAxZTc3YTE2OWIwZiIsInRzIjoxNzMyNjYzMzI2LjM1NjQ2OCwic2VuZGVyIjoiZGV2bnVsbCtkbXVraGluLmZvcmQuY29tQGtlcm5lbC5vcmciLCJyZWNpcGllbnQiOiJ4ZW4tZGV2ZWxAbGlzdHMueGVucHJvamVjdC5vcmcifQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1732663316; bh=50fKjc2QOVuxtHeCWL67mp4YIYRrVBdHtpZLvHIma5E=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=BBoTyplhMIAPEAOnJhFln241XCN141CxblrzJCf0bRaf3R6yqKmOnrTKzlU0yhCaJ L6+hYvAMtPk6+Nv2Ss611hnJD51ZQUDtgCo5B4LvRPpieEBOrdGl6+LBZ9T2XaBrBU UKqv/PKH2bKvM1+Du0mEFXUp0eXEgqDM8TwOxn1b6w7OWODGqHLCCzOlnZ5uVQldgQ xoSmncVBRkZ2ld06R5RYwAszQNZaL7ZL/b7V5lFcb7rXXbsCo22I/e4BsjcnLBxd++ awpFMdzAAym2D0wjAK8isiYRERxu94xr6vRbLkamxim8KEK4+AJzVsL9cjSPu1jwI2 s06zjdIbGWvyA== From: Denis Mukhin via B4 Relay Date: Tue, 26 Nov 2024 15:22:10 -0800 Subject: [PATCH 20/36] xen/console: introduce consoled_is_enabled() MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241126-vuart-ns8250-v1-v1-20-87b9a8375b7a@ford.com> References: <20241126-vuart-ns8250-v1-v1-0-87b9a8375b7a@ford.com> In-Reply-To: <20241126-vuart-ns8250-v1-v1-0-87b9a8375b7a@ford.com> To: Jan Beulich , Andrew Cooper , =?utf-8?q?Roger_Pau_Monn=C3=A9?= , "Daniel P. Smith" , Stefano Stabellini , Julien Grall , Bertrand Marquis , Michal Orzel , Rahul Singh , Volodymyr Babchuk , Alistair Francis , Bob Eshleman , Connor Davis , Oleksii Kurochko , Shawn Anastasio , Anthony PERARD , Juergen Gross , Christian Lindig , David Scott , =?utf-8?q?Marek_Marczykowski-G=C3=B3recki?= Cc: xen-devel@lists.xenproject.org, Denis Mukhin X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1732663312; l=4384; i=dmukhin@ford.com; s=20241125; h=from:subject:message-id; bh=dmfspZvPgoI4EGX+YrlzVMe2EpWEao1fcT911zaxlEE=; b=b8yT+vorsOT/zpMXLcXELRcjbP8A5xks6ATDBkx57XKFIDY+aHn3Ylyvhm4Z3AH3+ZRx1C8qL Jwel3yfp81XClJATR0JRkeqv+Ek2LpNbnP2Vh/Z/EibO0x25KL5xBeT X-Developer-Key: i=dmukhin@ford.com; a=ed25519; pk=SsDZ9p39s0fqcpUKQuqKqrbn0rq6EtEAClvpOpzx6+U= X-Endpoint-Received: by B4 Relay for dmukhin@ford.com/20241125 with auth_id=287 X-Original-From: Denis Mukhin Reply-To: dmukhin@ford.com X-ZohoMail-DKIM: pass (identity @kernel.org) X-ZM-MESSAGEID: 1732663901209019100 From: Denis Mukhin There are few places which check pv_shim console under CONFIG_PV_SHIM in xen console driver. Instead of #ifdef-ing, use new consoled_is_enabled() to customize the logic. Header file now can be included w/o CONFIG_X86. Signature of consoled_guest_{rx,tx} has changed to account for follow-on console switch logic cleanup. Signed-off-by: Denis Mukhin --- xen/drivers/char/console.c | 10 +++------- xen/drivers/char/consoled.c | 18 ++++++++++++++---- xen/include/xen/consoled.h | 35 +++++++++++++++++++++++++++++++++-- 3 files changed, 50 insertions(+), 13 deletions(-) diff --git a/xen/drivers/char/console.c b/xen/drivers/char/console.c index f034ce5aab3f3bf59b0df9fa583ee9ce32dbf665..60c055396b697869b04b9132b0d= cfa832fabe932 100644 --- a/xen/drivers/char/console.c +++ b/xen/drivers/char/console.c @@ -33,9 +33,9 @@ #include #include #include +#include =20 #ifdef CONFIG_X86 -#include #include #endif #ifdef CONFIG_SBSA_VUART_CONSOLE @@ -505,11 +505,9 @@ static void console_find_owner(void) break; } =20 -#ifdef CONFIG_PV_SHIM - if ( next_rx =3D=3D 1 ) + if ( consoled_is_enabled() && next_rx =3D=3D 1 ) domid =3D get_initial_domain_id(); else -#endif domid =3D next_rx - 1; d =3D rcu_lock_domain_by_id(domid); if ( d ) @@ -573,10 +571,8 @@ static void __serial_rx(char c) #endif } =20 -#ifdef CONFIG_X86 - if ( pv_shim && pv_console ) + if ( consoled_is_enabled() ) consoled_guest_tx(c); -#endif } =20 static void cf_check serial_rx(char c) diff --git a/xen/drivers/char/consoled.c b/xen/drivers/char/consoled.c index b415b632cecc0a80e161b701d7b70ba4f3cc5fb8..d6624e7697f56e1a1959b0efa5d= ca104f34af002 100644 --- a/xen/drivers/char/consoled.c +++ b/xen/drivers/char/consoled.c @@ -43,13 +43,13 @@ struct xencons_interface *consoled_get_ring_addr(void) static char buf[BUF_SZ + 1]; =20 /* Receives characters from a domain's PV console */ -void consoled_guest_rx(void) +int consoled_guest_rx(void) { size_t idx =3D 0; XENCONS_RING_IDX cons, prod; =20 if ( !cons_ring ) - return; + return 0; =20 spin_lock(&rx_lock); =20 @@ -91,15 +91,17 @@ void consoled_guest_rx(void) =20 out: spin_unlock(&rx_lock); + + return 0; } =20 /* Sends a character into a domain's PV console */ -void consoled_guest_tx(char c) +int consoled_guest_tx(char c) { XENCONS_RING_IDX cons, prod; =20 if ( !cons_ring ) - return; + return 0; =20 cons =3D ACCESS_ONCE(cons_ring->in_cons); prod =3D cons_ring->in_prod; @@ -118,6 +120,7 @@ void consoled_guest_tx(char c) =20 cons_ring->in[MASK_XENCONS_IDX(prod++, cons_ring->in)] =3D c; =20 + /* Write to the ring before updating the pointer */ smp_wmb(); ACCESS_ONCE(cons_ring->in_prod) =3D prod; @@ -125,6 +128,13 @@ void consoled_guest_tx(char c) notify: /* Always notify the guest: prevents receive path from getting stuck. = */ pv_shim_inject_evtchn(pv_console_evtchn()); + + return 0; +} + +bool consoled_is_enabled(void) +{ + return pv_shim && pv_console; } =20 /* diff --git a/xen/include/xen/consoled.h b/xen/include/xen/consoled.h index bd7ab6329ee8a7c466484021247241ded8ed03c7..b88e3025fde84a52d7027b785b0= a51ada8493832 100644 --- a/xen/include/xen/consoled.h +++ b/xen/include/xen/consoled.h @@ -3,10 +3,41 @@ =20 #include =20 +#if defined(CONFIG_PV_SHIM) + void consoled_set_ring_addr(struct xencons_interface *ring); struct xencons_interface *consoled_get_ring_addr(void); -void consoled_guest_rx(void); -void consoled_guest_tx(char c); +int consoled_guest_rx(void); +int consoled_guest_tx(char c); +bool consoled_is_enabled(void); + +#else + +void consoled_set_ring_addr(struct xencons_interface *ring) +{ +} + +struct xencons_interface *consoled_get_ring_addr(void) +{ + return NULL; +} + +int consoled_guest_rx(void) +{ + return 0; +} + +int consoled_guest_tx(char c) +{ + return 0; +} + +bool consoled_is_enabled(void) +{ + return false; +} + +#endif /* #if defined(CONFIG_PV_SHIM) */ =20 #endif /* __XEN_CONSOLED_H__ */ /* --=20 2.34.1