From 36c7343b4ecac2432430f5393314f1bdc2c219a5 Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Mon, 23 Jun 2008 12:06:52 +0100 Subject: tty_driver: Update required method documentation Some of the requirement rules are now more relaxed. Also correct a contradiction in the previous update Signed-off-by: Alan Cox Signed-off-by: Linus Torvalds --- include/linux/tty_driver.h | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'include') diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h index 59f1c0bd8f9..d2a00358676 100644 --- a/include/linux/tty_driver.h +++ b/include/linux/tty_driver.h @@ -27,8 +27,7 @@ * This routine is called by the kernel to write a series of * characters to the tty device. The characters may come from * user space or kernel space. This routine will return the - * number of characters actually accepted for writing. This - * routine is mandatory. + * number of characters actually accepted for writing. * * Optional: Required for writable devices. * @@ -134,7 +133,7 @@ * This routine notifies the tty driver that it should hangup the * tty device. * - * Required: + * Optional: * * void (*break_ctl)(struct tty_stuct *tty, int state); * -- cgit v1.2.3-18-g5258 From 72c6e251ed84b3a9cdfde6711191155c47bb2b9c Mon Sep 17 00:00:00 2001 From: Thorsten Kranzkowski Date: Mon, 23 Jun 2008 20:57:22 +0000 Subject: alpha: fix compile error in arch/alpha/mm/init.c MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Commit 9267b4b3880d00dc2dab90f1d817c856939114f7 ("alpha: fix module load failures on smp (bug #10926)") causes a regression for my ev4 uniprocessor build: CC arch/alpha/mm/init.o /export/data/repositories/linux-2.6/arch/alpha/mm/init.c:34: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘typeof’ make[2]: *** [arch/alpha/mm/init.o] Error 1 make[1]: *** [arch/alpha/mm] Error 2 make: *** [sub-make] Error 2 This fixes it for me (compile and boot tested): Signed-off-by: Thorsten Kranzkowski Acked-by: Ivan Kokshaysky Signed-off-by: Linus Torvalds --- include/asm-alpha/percpu.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include') diff --git a/include/asm-alpha/percpu.h b/include/asm-alpha/percpu.h index 82e8a94b4b2..3495e8e00d7 100644 --- a/include/asm-alpha/percpu.h +++ b/include/asm-alpha/percpu.h @@ -69,6 +69,8 @@ extern unsigned long __per_cpu_offset[NR_CPUS]; #define __get_cpu_var(var) per_cpu_var(var) #define __raw_get_cpu_var(var) per_cpu_var(var) +#define PER_CPU_ATTRIBUTES + #endif /* SMP */ #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu_var(name) -- cgit v1.2.3-18-g5258 From 06e05645661211b9eaadaf6344c335d2e80f0ba2 Mon Sep 17 00:00:00 2001 From: Marcelo Tosatti Date: Fri, 6 Jun 2008 16:37:36 -0300 Subject: KVM: close timer injection race window in __vcpu_run If a timer fires after kvm_inject_pending_timer_irqs() but before local_irq_disable() the code will enter guest mode and only inject such timer interrupt the next time an unrelated event causes an exit. It would be simpler if the timer->pending irq conversion could be done with IRQ's disabled, so that the above problem cannot happen. For now introduce a new vcpu requests bit to cancel guest entry. Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- include/linux/kvm_host.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include') diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 092b1b25291..de9d1df4bba 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -33,6 +33,7 @@ #define KVM_REQ_REPORT_TPR_ACCESS 2 #define KVM_REQ_MMU_RELOAD 3 #define KVM_REQ_TRIPLE_FAULT 4 +#define KVM_REQ_PENDING_TIMER 5 struct kvm_vcpu; extern struct kmem_cache *kvm_vcpu_cache; -- cgit v1.2.3-18-g5258 From 28499143933f19b28008a556ed59255d6009391a Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Fri, 9 May 2008 12:05:57 +0100 Subject: xen: remove support for non-PAE 32-bit Non-PAE operation has been deprecated in Xen for a while, and is rarely tested or used. xen-unstable has now officially dropped non-PAE support. Since Xen/pvops' non-PAE support has also been broken for a while, we may as well completely drop it altogether. Signed-off-by: Jeremy Fitzhardinge Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar --- include/asm-x86/xen/page.h | 4 ---- 1 file changed, 4 deletions(-) (limited to 'include') diff --git a/include/asm-x86/xen/page.h b/include/asm-x86/xen/page.h index baf3a4dce28..e11f24038b1 100644 --- a/include/asm-x86/xen/page.h +++ b/include/asm-x86/xen/page.h @@ -150,13 +150,9 @@ static inline pte_t __pte_ma(pteval_t x) return (pte_t) { .pte = x }; } -#ifdef CONFIG_X86_PAE #define pmd_val_ma(v) ((v).pmd) #define pud_val_ma(v) ((v).pgd.pgd) #define __pmd_ma(x) ((pmd_t) { (x) } ) -#else /* !X86_PAE */ -#define pmd_val_ma(v) ((v).pud.pgd.pgd) -#endif /* CONFIG_X86_PAE */ #define pgd_val_ma(x) ((x).pgd) -- cgit v1.2.3-18-g5258 From 7af192c954017499ec163bc9dbaaee2e593d7ef2 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Tue, 3 Jun 2008 16:17:29 +0200 Subject: x86: Add structs and functions for paravirt clocksource This patch adds structs for the paravirt clocksource ABI used by both xen and kvm (pvclock-abi.h). It also adds some helper functions to read system time and wall clock time from a paravirtual clocksource (pvclock.[ch]). They are based on the xen code. They are enabled using CONFIG_PARAVIRT_CLOCK. Subsequent patches of this series will put the code in use. Signed-off-by: Gerd Hoffmann Acked-by: Jeremy Fitzhardinge Signed-off-by: Avi Kivity --- include/asm-x86/pvclock-abi.h | 42 ++++++++++++++++++++++++++++++++++++++++++ include/asm-x86/pvclock.h | 13 +++++++++++++ 2 files changed, 55 insertions(+) create mode 100644 include/asm-x86/pvclock-abi.h create mode 100644 include/asm-x86/pvclock.h (limited to 'include') diff --git a/include/asm-x86/pvclock-abi.h b/include/asm-x86/pvclock-abi.h new file mode 100644 index 00000000000..6857f840b24 --- /dev/null +++ b/include/asm-x86/pvclock-abi.h @@ -0,0 +1,42 @@ +#ifndef _ASM_X86_PVCLOCK_ABI_H_ +#define _ASM_X86_PVCLOCK_ABI_H_ +#ifndef __ASSEMBLY__ + +/* + * These structs MUST NOT be changed. + * They are the ABI between hypervisor and guest OS. + * Both Xen and KVM are using this. + * + * pvclock_vcpu_time_info holds the system time and the tsc timestamp + * of the last update. So the guest can use the tsc delta to get a + * more precise system time. There is one per virtual cpu. + * + * pvclock_wall_clock references the point in time when the system + * time was zero (usually boot time), thus the guest calculates the + * current wall clock by adding the system time. + * + * Protocol for the "version" fields is: hypervisor raises it (making + * it uneven) before it starts updating the fields and raises it again + * (making it even) when it is done. Thus the guest can make sure the + * time values it got are consistent by checking the version before + * and after reading them. + */ + +struct pvclock_vcpu_time_info { + u32 version; + u32 pad0; + u64 tsc_timestamp; + u64 system_time; + u32 tsc_to_system_mul; + s8 tsc_shift; + u8 pad[3]; +} __attribute__((__packed__)); /* 32 bytes */ + +struct pvclock_wall_clock { + u32 version; + u32 sec; + u32 nsec; +} __attribute__((__packed__)); + +#endif /* __ASSEMBLY__ */ +#endif /* _ASM_X86_PVCLOCK_ABI_H_ */ diff --git a/include/asm-x86/pvclock.h b/include/asm-x86/pvclock.h new file mode 100644 index 00000000000..85b1bba8e0a --- /dev/null +++ b/include/asm-x86/pvclock.h @@ -0,0 +1,13 @@ +#ifndef _ASM_X86_PVCLOCK_H_ +#define _ASM_X86_PVCLOCK_H_ + +#include +#include + +/* some helper functions for xen and kvm pv clock sources */ +cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src); +void pvclock_read_wallclock(struct pvclock_wall_clock *wall, + struct pvclock_vcpu_time_info *vcpu, + struct timespec *ts); + +#endif /* _ASM_X86_PVCLOCK_H_ */ -- cgit v1.2.3-18-g5258 From 1c7b67f7576c4ca2a344379a4a29eec8fe8e7935 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Tue, 3 Jun 2008 16:17:30 +0200 Subject: x86: Make xen use the paravirt clocksource structs and functions This patch updates the xen guest to use the pvclock structs and helper functions. Signed-off-by: Gerd Hoffmann Acked-by: Jeremy Fitzhardinge Signed-off-by: Avi Kivity --- include/xen/interface/xen.h | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) (limited to 'include') diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h index 9b018da48cf..819a0331cda 100644 --- a/include/xen/interface/xen.h +++ b/include/xen/interface/xen.h @@ -10,6 +10,7 @@ #define __XEN_PUBLIC_XEN_H__ #include +#include /* * XEN "SYSTEM CALLS" (a.k.a. HYPERCALLS). @@ -336,7 +337,7 @@ struct vcpu_info { uint8_t evtchn_upcall_mask; unsigned long evtchn_pending_sel; struct arch_vcpu_info arch; - struct vcpu_time_info time; + struct pvclock_vcpu_time_info time; }; /* 64 bytes (x86) */ /* @@ -384,9 +385,7 @@ struct shared_info { * Wallclock time: updated only by control software. Guests should base * their gettimeofday() syscall on this wallclock-base value. */ - uint32_t wc_version; /* Version counter: see vcpu_time_info_t. */ - uint32_t wc_sec; /* Secs 00:00:00 UTC, Jan 1, 1970. */ - uint32_t wc_nsec; /* Nsecs 00:00:00 UTC, Jan 1, 1970. */ + struct pvclock_wall_clock wc; struct arch_shared_info arch; -- cgit v1.2.3-18-g5258 From 50d0a0f987b83a8dadb1134d834e35ec410392b5 Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Tue, 3 Jun 2008 16:17:31 +0200 Subject: KVM: Make kvm host use the paravirt clocksource structs This patch updates the kvm host code to use the pvclock structs. It also makes the paravirt clock compatible with Xen. Signed-off-by: Gerd Hoffmann Signed-off-by: Avi Kivity --- include/asm-x86/kvm_host.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h index 1d8cd01fa51..844f2a89afb 100644 --- a/include/asm-x86/kvm_host.h +++ b/include/asm-x86/kvm_host.h @@ -18,6 +18,7 @@ #include #include +#include #include #define KVM_MAX_VCPUS 16 @@ -282,7 +283,8 @@ struct kvm_vcpu_arch { struct x86_emulate_ctxt emulate_ctxt; gpa_t time; - struct kvm_vcpu_time_info hv_clock; + struct pvclock_vcpu_time_info hv_clock; + unsigned int hv_clock_tsc_khz; unsigned int time_offset; struct page *time_page; }; -- cgit v1.2.3-18-g5258 From 6b1ed9086592fd4b066daae222751bb6757ca5eb Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Tue, 3 Jun 2008 16:17:33 +0200 Subject: KVM: Remove now unused structs from kvm_para.h The kvm_* structs are obsoleted by the pvclock_* ones. Now all users have been switched over and the old structs can be dropped. Signed-off-by: Gerd Hoffmann Signed-off-by: Avi Kivity --- include/asm-x86/kvm_para.h | 18 ------------------ 1 file changed, 18 deletions(-) (limited to 'include') diff --git a/include/asm-x86/kvm_para.h b/include/asm-x86/kvm_para.h index 50984594207..bfd9900742b 100644 --- a/include/asm-x86/kvm_para.h +++ b/include/asm-x86/kvm_para.h @@ -48,24 +48,6 @@ struct kvm_mmu_op_release_pt { #ifdef __KERNEL__ #include -/* xen binary-compatible interface. See xen headers for details */ -struct kvm_vcpu_time_info { - uint32_t version; - uint32_t pad0; - uint64_t tsc_timestamp; - uint64_t system_time; - uint32_t tsc_to_system_mul; - int8_t tsc_shift; - int8_t pad[3]; -} __attribute__((__packed__)); /* 32 bytes */ - -struct kvm_wall_clock { - uint32_t wc_version; - uint32_t wc_sec; - uint32_t wc_nsec; -} __attribute__((__packed__)); - - extern void kvmclock_init(void); -- cgit v1.2.3-18-g5258