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Thu, 16 Apr 2020 09:41:57 +0000 From: Pawel Wieczorkiewicz To: Subject: [XTF 3/4] Enabled serial writing for hvm guests Date: Thu, 16 Apr 2020 09:41:40 +0000 Message-ID: <20200416094141.65120-4-wipawel@amazon.de> X-Mailer: git-send-email 2.16.6 In-Reply-To: <20200416094141.65120-1-wipawel@amazon.de> References: <20200416094141.65120-1-wipawel@amazon.de> MIME-Version: 1.0 Precedence: Bulk X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Paul Semel , julien@xen.org, paul@xen.org, semelpaul@gmail.com, andrew.cooper3@citrix.com, Pawel Wieczorkiewicz , nmanthey@amazon.de Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" From: Paul Semel setup.c: PV console writing is not working in Xen 4.2 for hvm guests, so we make xtf write to COM1 serial port to get its output Signed-off-by: Paul Semel Signed-off-by: Pawel Wieczorkiewicz --- arch/x86/setup.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/x86/setup.c b/arch/x86/setup.c index 3c84e96..f6fa4df 100644 --- a/arch/x86/setup.c +++ b/arch/x86/setup.c @@ -238,6 +238,13 @@ static void qemu_console_write(const char *buf, size_t len) : "d" (0x12)); } +static void com1_write(const char *buf, size_t len) +{ + asm volatile("rep; outsb" + : "+S" (buf), "+c" (len) + : "d" (0x3f8)); +} + static void xen_console_write(const char *buf, size_t len) { hypercall_console_write(buf, len); @@ -246,7 +253,14 @@ static void xen_console_write(const char *buf, size_t len) void arch_setup(void) { if ( IS_DEFINED(CONFIG_HVM) && !pvh_start_info ) + { register_console_callback(qemu_console_write); + } + + if ( IS_DEFINED(CONFIG_HVM) ) + { + register_console_callback(com1_write); + } register_console_callback(xen_console_write);