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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241126-vuart-ns8250-v1-v1-26-87b9a8375b7a@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=4283; i=dmukhin@ford.com; s=20241125; h=from:subject:message-id; bh=mC1dfr4+26P41BllPMG6MZbu9F46btGiiA2X1kH3gME=; b=hb4ZH7CsrUUdK9/NkrG9FYu22AqGi/bZMiyvvI9e3EZYIzNKn/vse7pJTCknstGu43n9nc68n zegv/33ak9sCf0BS87RJVnZ4f1YoDras7AKDidQNrQtdz43jVQn137A 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: 1732664270908019100 From: Denis Mukhin PV Linux kernel uses HYPERVISOR_console_io hypercall for early console which ends up being handled by Xen's console driver's guest_console_write(). guest_console_write() duplicates the code from __putstr(), elimitate code duplication. Signed-off-by: Denis Mukhin --- xen/drivers/char/console.c | 94 ++++++++++++++++++++++++------------------= ---- 1 file changed, 50 insertions(+), 44 deletions(-) diff --git a/xen/drivers/char/console.c b/xen/drivers/char/console.c index 4439e00763631969767719053cdc81e67c2cda2c..3d8d3c852e69d8fddd1d978fdd8= 932eb75551f25 100644 --- a/xen/drivers/char/console.c +++ b/xen/drivers/char/console.c @@ -665,6 +665,19 @@ static void cf_check notify_dom0_con_ring(void *unused) static DECLARE_SOFTIRQ_TASKLET(notify_dom0_con_ring_tasklet, notify_dom0_con_ring, NULL); =20 +static bool console_locks_busted; + +static void conring_write(const char *str, size_t len) +{ + if ( opt_console_to_ring ) + { + conring_puts(str, len); + + if ( !console_locks_busted ) + tasklet_schedule(¬ify_dom0_con_ring_tasklet); + } +} + #ifdef CONFIG_X86 static inline void xen_console_write_debug_port(const char *buf, size_t le= n) { @@ -673,8 +686,43 @@ static inline void xen_console_write_debug_port(const = char *buf, size_t len) : "=3D&S" (tmp), "=3D&c" (tmp) : "0" (buf), "1" (len), "d" (XEN_HVM_DEBUGCONS_IOPORT) = ); } + +static void xen_console_write(const char *str, size_t len) +{ + if ( opt_console_xen ) + { + if ( xen_guest ) + xen_hypercall_console_write(str, len); + else + xen_console_write_debug_port(str, len); + } +} +#else +static void xen_console_write(const char *str, size_t len) +{ +} #endif =20 +/* + * Write characters to console. + * + * That will handle all possible scenarios working w/ console + * - serial console; + * - video output; + * - __HYPERVISOR_console_io hypercall (x86 only); + * - debug I/O port (x86 only); + * - forward to Xen event channel. + */ +static void console_write(const char *str, size_t len) +{ + ASSERT(rspin_is_locked(&console_lock)); + + console_serial_puts(str, len); + video_puts(str, len); + xen_console_write(str, len); + conring_write(str, len); +} + static long guest_console_write(XEN_GUEST_HANDLE_PARAM(char) buffer, unsigned int count) { @@ -695,28 +743,8 @@ static long guest_console_write(XEN_GUEST_HANDLE_PARAM= (char) buffer, =20 if ( is_hardware_domain(cd) ) { - /* Use direct console output as it could be interactive */ nrspin_lock_irq(&console_lock); - - console_serial_puts(kbuf, kcount); - video_puts(kbuf, kcount); - -#ifdef CONFIG_X86 - if ( opt_console_xen ) - { - if ( xen_guest ) - xen_hypercall_console_write(kbuf, kcount); - else - xen_console_write_debug_port(kbuf, kcount); - } -#endif - - if ( opt_console_to_ring ) - { - conring_puts(kbuf, kcount); - tasklet_schedule(¬ify_dom0_con_ring_tasklet); - } - + console_write(kbuf, kcount); nrspin_unlock_irq(&console_lock); } else @@ -817,31 +845,9 @@ long do_console_io( * ***************************************************** */ =20 -static bool console_locks_busted; - static void __putstr(const char *str) { - size_t len =3D strlen(str); - - ASSERT(rspin_is_locked(&console_lock)); - - console_serial_puts(str, len); - video_puts(str, len); - -#ifdef CONFIG_X86 - if ( opt_console_xen ) - { - if ( xen_guest ) - xen_hypercall_console_write(str, len); - else - xen_console_write_debug_port(str, len); - } -#endif - - conring_puts(str, len); - - if ( !console_locks_busted ) - tasklet_schedule(¬ify_dom0_con_ring_tasklet); + console_write(str, strlen(str)); } =20 static int printk_prefix_check(char *p, char **pp) --=20 2.34.1