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Peter Anvin" , Paolo Bonzini , Joao Martins , Thomas Gleixner Subject: [Xen-devel] [PATCH v6 1/4] x86/pvclock: add setter for pvclock_pvti_cpu0_va X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP Right now there is only a pvclock_pvti_cpu0_va() which is defined on kvmclock since: commit dac16fba6fc5 ("x86/vdso: Get pvclock data from the vvar VMA instead of the fixmap") The only user of this interface so far is kvm. This commit adds a setter function for the pvti page and moves pvclock_pvti_cpu0_va to pvclock, which is a more generic place to have it; and would allow other PV clocksources to use it, such as Xen. Signed-off-by: Joao Martins Acked-by: Andy Lutomirski --- Changes since v1: * Rebased: the only conflict was that I had move the export pvclock_pvti_cpu0_va() symbol as it is used by kvm PTP driver. * Do not initialize pvti_cpu0_va to NULL (checkpatch error) ( Comments from Andy Lutomirski ) * Removed asm/pvclock.h 'pvclock_set_pvti_cpu0_va' definition for non !PARAVIRT_CLOCK to better track screwed Kconfig stuff. * Add his Acked-by (provided the previous adjustment was made) Changes since RFC: (Comments from Andy Lutomirski) * Add __init to pvclock_set_pvti_cpu0_va * Add WARN_ON(vclock_was_used(VCLOCK_PVCLOCK)) to pvclock_set_pvti_cpu0_va --- arch/x86/include/asm/pvclock.h | 19 ++++++++++--------- arch/x86/kernel/kvmclock.c | 7 +------ arch/x86/kernel/pvclock.c | 14 ++++++++++++++ 3 files changed, 25 insertions(+), 15 deletions(-) diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h index 448cfe1b48cf..6f228f90cdd7 100644 --- a/arch/x86/include/asm/pvclock.h +++ b/arch/x86/include/asm/pvclock.h @@ -4,15 +4,6 @@ #include #include -#ifdef CONFIG_KVM_GUEST -extern struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void); -#else -static inline struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void) -{ - return NULL; -} -#endif - /* some helper functions for xen and kvm pv clock sources */ u64 pvclock_clocksource_read(struct pvclock_vcpu_time_info *src); u8 pvclock_read_flags(struct pvclock_vcpu_time_info *src); @@ -101,4 +92,14 @@ struct pvclock_vsyscall_time_info { #define PVTI_SIZE sizeof(struct pvclock_vsyscall_time_info) +#ifdef CONFIG_PARAVIRT_CLOCK +void pvclock_set_pvti_cpu0_va(struct pvclock_vsyscall_time_info *pvti); +struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void); +#else +static inline struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void) +{ + return NULL; +} +#endif + #endif /* _ASM_X86_PVCLOCK_H */ diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c index d88967659098..538738047ff5 100644 --- a/arch/x86/kernel/kvmclock.c +++ b/arch/x86/kernel/kvmclock.c @@ -47,12 +47,6 @@ early_param("no-kvmclock", parse_no_kvmclock); static struct pvclock_vsyscall_time_info *hv_clock; static struct pvclock_wall_clock wall_clock; -struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void) -{ - return hv_clock; -} -EXPORT_SYMBOL_GPL(pvclock_pvti_cpu0_va); - /* * The wallclock is the time of day when we booted. Since then, some time may * have elapsed since the hypervisor wrote the data. So we try to account for @@ -334,6 +328,7 @@ int __init kvm_setup_vsyscall_timeinfo(void) return 1; } + pvclock_set_pvti_cpu0_va(hv_clock); put_cpu(); kvm_clock.archdata.vclock_mode = VCLOCK_PVCLOCK; diff --git a/arch/x86/kernel/pvclock.c b/arch/x86/kernel/pvclock.c index 5c3f6d6a5078..cb7d6d9c9c2d 100644 --- a/arch/x86/kernel/pvclock.c +++ b/arch/x86/kernel/pvclock.c @@ -25,8 +25,10 @@ #include #include +#include static u8 valid_flags __read_mostly = 0; +static struct pvclock_vsyscall_time_info *pvti_cpu0_va __read_mostly; void pvclock_set_flags(u8 flags) { @@ -144,3 +146,15 @@ void pvclock_read_wallclock(struct pvclock_wall_clock *wall_clock, set_normalized_timespec(ts, now.tv_sec, now.tv_nsec); } + +void pvclock_set_pvti_cpu0_va(struct pvclock_vsyscall_time_info *pvti) +{ + WARN_ON(vclock_was_used(VCLOCK_PVCLOCK)); + pvti_cpu0_va = pvti; +} + +struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void) +{ + return pvti_cpu0_va; +} +EXPORT_SYMBOL_GPL(pvclock_pvti_cpu0_va);