x86/kvmclock: Remove page size requirement from wall_clock
There is no requirement for wall_clock data to be page aligned or page sized. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Cc: steven.sistare@oracle.com Cc: daniel.m.jordan@oracle.com Cc: linux@armlinux.org.uk Cc: schwidefsky@de.ibm.com Cc: heiko.carstens@de.ibm.com Cc: john.stultz@linaro.org Cc: sboyd@codeaurora.org Cc: hpa@zytor.com Cc: douly.fnst@cn.fujitsu.com Cc: peterz@infradead.org Cc: prarit@redhat.com Cc: feng.tang@intel.com Cc: pmladek@suse.com Cc: gnomes@lxorguk.ukuu.org.uk Cc: linux-s390@vger.kernel.org Cc: boris.ostrovsky@oracle.com Cc: jgross@suse.com Link: https://lkml.kernel.org/r/20180719205545.16512-3-pasha.tatashin@oracle.com
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@ -46,14 +46,12 @@ early_param("no-kvmclock", parse_no_kvmclock);
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/* Aligned to page sizes to match whats mapped via vsyscalls to userspace */
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#define HV_CLOCK_SIZE (sizeof(struct pvclock_vsyscall_time_info) * NR_CPUS)
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#define WALL_CLOCK_SIZE (sizeof(struct pvclock_wall_clock))
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static u8 hv_clock_mem[PAGE_ALIGN(HV_CLOCK_SIZE)] __aligned(PAGE_SIZE);
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static u8 wall_clock_mem[PAGE_ALIGN(WALL_CLOCK_SIZE)] __aligned(PAGE_SIZE);
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/* The hypervisor will put information about time periodically here */
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static struct pvclock_vsyscall_time_info *hv_clock;
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static struct pvclock_wall_clock *wall_clock;
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static struct pvclock_wall_clock wall_clock;
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/*
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* The wallclock is the time of day when we booted. Since then, some time may
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@ -66,15 +64,15 @@ static void kvm_get_wallclock(struct timespec64 *now)
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int low, high;
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int cpu;
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low = (int)slow_virt_to_phys(wall_clock);
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high = ((u64)slow_virt_to_phys(wall_clock) >> 32);
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low = (int)slow_virt_to_phys(&wall_clock);
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high = ((u64)slow_virt_to_phys(&wall_clock) >> 32);
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native_write_msr(msr_kvm_wall_clock, low, high);
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cpu = get_cpu();
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vcpu_time = &hv_clock[cpu].pvti;
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pvclock_read_wallclock(wall_clock, vcpu_time, now);
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pvclock_read_wallclock(&wall_clock, vcpu_time, now);
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put_cpu();
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}
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@ -267,12 +265,10 @@ void __init kvmclock_init(void)
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} else if (!(kvmclock && kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE)))
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return;
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wall_clock = (struct pvclock_wall_clock *)wall_clock_mem;
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hv_clock = (struct pvclock_vsyscall_time_info *)hv_clock_mem;
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if (kvm_register_clock("primary cpu clock")) {
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hv_clock = NULL;
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wall_clock = NULL;
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return;
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}
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