diff options
| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2008-06-20 15:24:18 +0200 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2008-07-25 12:06:07 +1000 |
| commit | faeba830b086bc9e58748869054e994cb09693cd (patch) | |
| tree | 5d2f2beb6b3ae012c7eedaa48bc1845cb156945f | |
| parent | 7721c494a28e06543a3d6aa412957aa783a4a531 (diff) | |
s390: use virtio_console for KVM on s390
This patch enables virtio_console as the default console on kvm for
s390. We currently use the same notify hack as lguest for early
console output. I will try to address this for lguest and s390 later.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| -rw-r--r-- | arch/s390/Kconfig | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/setup.c | 4 | ||||
| -rw-r--r-- | drivers/s390/kvm/kvm_virtio.c | 20 | ||||
| -rw-r--r-- | include/asm-s390/kvm_virtio.h | 10 |
4 files changed, 34 insertions, 1 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index eb530b4128ba..2ed88122be93 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -565,6 +565,7 @@ bool "s390 guest support (EXPERIMENTAL)" depends on 64BIT && EXPERIMENTAL select VIRTIO select VIRTIO_RING + select VIRTIO_CONSOLE help Select this option if you want to run the kernel under s390 linux endmenu diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index b358e18273b0..62122bad1e33 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -54,6 +54,7 @@ #include <asm/sections.h> #include <asm/ebcdic.h> #include <asm/compat.h> +#include <asm/kvm_virtio.h> long psw_kernel_bits = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY | PSW_MASK_MCHECK | PSW_DEFAULT_KEY); @@ -766,7 +767,8 @@ setup_arch(char **cmdline_p) printk("We are running under VM (64 bit mode)\n"); else if (MACHINE_IS_KVM) { printk("We are running under KVM (64 bit mode)\n"); - add_preferred_console("ttyS", 1, NULL); + add_preferred_console("hvc", 0, NULL); + s390_virtio_console_init(); } else printk("We are running native (64 bit mode)\n"); #endif /* CONFIG_64BIT */ diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c index 5ab34340919b..d41f234bb2c2 100644 --- a/drivers/s390/kvm/kvm_virtio.c +++ b/drivers/s390/kvm/kvm_virtio.c @@ -15,6 +15,7 @@ #include <linux/err.h> #include <linux/virtio.h> #include <linux/virtio_config.h> +#include <linux/virtio_console.h> #include <linux/interrupt.h> #include <linux/virtio_ring.h> #include <linux/pfn.h> @@ -333,6 +334,25 @@ static int __init kvm_devices_init(void) return 0; } +/* code for early console output with virtio_console */ +static __init int early_put_chars(u32 vtermno, const char *buf, int count) +{ + char scratch[17]; + unsigned int len = count; + + if (len > sizeof(scratch) - 1) + len = sizeof(scratch) - 1; + scratch[len] = '\0'; + memcpy(scratch, buf, len); + kvm_hypercall1(KVM_S390_VIRTIO_NOTIFY, __pa(scratch)); + return len; +} + +void s390_virtio_console_init(void) +{ + virtio_cons_early_init(early_put_chars); +} + /* * We do this after core stuff, but before the drivers. */ diff --git a/include/asm-s390/kvm_virtio.h b/include/asm-s390/kvm_virtio.h index 5c871a990c29..146100224def 100644 --- a/include/asm-s390/kvm_virtio.h +++ b/include/asm-s390/kvm_virtio.h @@ -50,4 +50,14 @@ struct kvm_vqconfig { #define KVM_S390_VIRTIO_RESET 1 #define KVM_S390_VIRTIO_SET_STATUS 2 +#ifdef __KERNEL__ +/* early virtio console setup */ +#ifdef CONFIG_VIRTIO_CONSOLE +extern void s390_virtio_console_init(void); +#else +static inline void s390_virtio_console_init(void) +{ +} +#endif /* CONFIG_VIRTIO_CONSOLE */ +#endif /* __KERNEL__ */ #endif |