From: Boqun Feng <boqun.feng@gmail.com>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Michael Kelley <mikelley@microsoft.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Sasha Levin <sashal@kernel.org>,
xen-devel@lists.xenproject.org,
Stefano Stabellini <sstabellini@kernel.org>,
linux-hyperv@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC 6/6] arm64: hyperv: Enable vDSO
Date: Wed, 18 Dec 2019 13:47:32 +0800 [thread overview]
Message-ID: <20191218054732.GK97412@debian-boqun.qqnc3lrjykvubdpftowmye0fmh.lx.internal.cloudapp.net> (raw)
In-Reply-To: <87y2vb82lz.fsf@vitty.brq.redhat.com>
On Tue, Dec 17, 2019 at 03:10:16PM +0100, Vitaly Kuznetsov wrote:
> Boqun Feng <boqun.feng@gmail.com> writes:
>
> > Similar to x86, add a new vclock_mode VCLOCK_HVCLOCK, and reuse the
> > hv_read_tsc_page() for userspace to read tsc page clocksource.
> >
> > Signed-off-by: Boqun Feng (Microsoft) <boqun.feng@gmail.com>
> > ---
> > arch/arm64/include/asm/clocksource.h | 3 ++-
> > arch/arm64/include/asm/mshyperv.h | 2 +-
> > arch/arm64/include/asm/vdso/gettimeofday.h | 19 +++++++++++++++++++
> > 3 files changed, 22 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/arm64/include/asm/clocksource.h b/arch/arm64/include/asm/clocksource.h
> > index fbe80057468c..c6acd45fe748 100644
> > --- a/arch/arm64/include/asm/clocksource.h
> > +++ b/arch/arm64/include/asm/clocksource.h
> > @@ -4,7 +4,8 @@
> >
> > #define VCLOCK_NONE 0 /* No vDSO clock available. */
> > #define VCLOCK_CNTVCT 1 /* vDSO should use cntvcnt */
> > -#define VCLOCK_MAX 1
> > +#define VCLOCK_HVCLOCK 2 /* vDSO should use vread_hvclock() */
> > +#define VCLOCK_MAX 2
> >
> > struct arch_clocksource_data {
> > int vclock_mode;
> > diff --git a/arch/arm64/include/asm/mshyperv.h b/arch/arm64/include/asm/mshyperv.h
> > index 0afb00e3501d..7c85dd816dca 100644
> > --- a/arch/arm64/include/asm/mshyperv.h
> > +++ b/arch/arm64/include/asm/mshyperv.h
> > @@ -90,7 +90,7 @@ extern void hv_get_vpreg_128(u32 reg, struct hv_get_vp_register_output *result);
> > #define hv_set_reference_tsc(val) \
> > hv_set_vpreg(HV_REGISTER_REFERENCE_TSC, val)
> > #define hv_set_clocksource_vdso(val) \
> > - ((val).archdata.vclock_mode = VCLOCK_NONE)
> > + ((val).archdata.vclock_mode = VCLOCK_HVCLOCK)
> >
> > #if IS_ENABLED(CONFIG_HYPERV)
> > #define hv_enable_stimer0_percpu_irq(irq) enable_percpu_irq(irq, 0)
> > diff --git a/arch/arm64/include/asm/vdso/gettimeofday.h b/arch/arm64/include/asm/vdso/gettimeofday.h
> > index e6e3fe0488c7..7e689b903f4d 100644
> > --- a/arch/arm64/include/asm/vdso/gettimeofday.h
> > +++ b/arch/arm64/include/asm/vdso/gettimeofday.h
> > @@ -67,6 +67,20 @@ int clock_getres_fallback(clockid_t _clkid, struct __kernel_timespec *_ts)
> > return ret;
> > }
> >
> > +#ifdef CONFIG_HYPERV_TIMER
> > +/* This will override the default hv_get_raw_timer() */
> > +#define hv_get_raw_timer() __arch_counter_get_cntvct()
> > +#include <clocksource/hyperv_timer.h>
> > +
> > +extern struct ms_hyperv_tsc_page
> > +_hvclock_page __attribute__((visibility("hidden")));
> > +
> > +static u64 vread_hvclock(void)
> > +{
> > + return hv_read_tsc_page(&_hvclock_page);
> > +}
> > +#endif
>
> The function is almost the same on x86 (&_hvclock_page ->
> &hvclock_page), would it maybe make sense to move this to arch neutral
> clocksource/hyperv_timer.h?
>
I'm not sure whether the underscore matters in the vDSO data symbol, so
I follow the architectural name convention. If the leading underscore
doesn't have special purpose I'm happy to move this to arch neutral
header file.
> > +
> > static __always_inline u64 __arch_get_hw_counter(s32 clock_mode)
> > {
> > u64 res;
> > @@ -78,6 +92,11 @@ static __always_inline u64 __arch_get_hw_counter(s32 clock_mode)
> > if (clock_mode == VCLOCK_NONE)
> > return __VDSO_USE_SYSCALL;
> >
> > +#ifdef CONFIG_HYPERV_TIMER
> > + if (likely(clock_mode == VCLOCK_HVCLOCK))
> > + return vread_hvclock();
>
> I'm not sure likely() is justified here: it'll make ALL builds which
> enable CONFIG_HYPERV_TIMER (e.g. distro kernels) to prefer
> VCLOCK_HVCLOCK, even if the kernel is not running on Hyper-V.
>
Make sense. Thanks for pointing this out! I will change it in the next
version.
Regards,
Boqun
> > +#endif
> > +
> > /*
> > * This isb() is required to prevent that the counter value
> > * is speculated.
>
> --
> Vitaly
>
next prev parent reply other threads:[~2019-12-18 5:47 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-16 0:19 [RFC 0/6] vDSO support for Hyper-V guest on ARM64 Boqun Feng
2019-12-16 0:19 ` [RFC 1/6] arm64: hyperv: Allow hv_get_raw_timer() definition to be overridden Boqun Feng
2019-12-16 0:19 ` [RFC 2/6] arm64: vdso: Add support for multiple vDSO data pages Boqun Feng
2019-12-16 0:19 ` [RFC 3/6] arm/arm64: clocksource: Introduce vclock_mode Boqun Feng
2019-12-16 0:19 ` [RFC 4/6] arm64: vdso: hyperv: Map tsc page into vDSO if enabled Boqun Feng
2019-12-16 0:19 ` [RFC 5/6] arm64: hyperv: Enable userspace to read cntvct Boqun Feng
2019-12-16 0:19 ` [RFC 6/6] arm64: hyperv: Enable vDSO Boqun Feng
2019-12-17 14:10 ` Vitaly Kuznetsov
2019-12-18 5:47 ` Boqun Feng [this message]
2020-01-23 10:48 ` [RFC 0/6] vDSO support for Hyper-V guest on ARM64 Vincenzo Frascino
2020-01-24 6:32 ` Boqun Feng
2020-01-24 10:24 ` Vincenzo Frascino
2020-01-28 5:58 ` Boqun Feng
2020-01-28 11:48 ` Marc Zyngier
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