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SubjectRE: [PATCH char-misc 1/1] Hyper-V: Remove x86-isms from architecture independent Hyper-V drivers
Date


> -----Original Message-----
> From: mikelley@exchange.microsoft.com
> [mailto:mikelley@exchange.microsoft.com]
> Sent: Wednesday, October 25, 2017 3:31 PM
> To: gregkh@linuxfoundation.org; linux-kernel@vger.kernel.org;
> devel@linuxdriverproject.org; olaf@aepfle.de; apw@canonical.com;
> vkuznets@redhat.com; jasowang@redhat.com;
> leann.ogasawara@canonical.com; marcelo.cerri@canonical.com; Stephen
> Hemminger <sthemmin@microsoft.com>; KY Srinivasan
> <kys@microsoft.com>
> Cc: Michael Kelley (EOSG) <Michael.H.Kelley@microsoft.com>
> Subject: [PATCH char-misc 1/1] Hyper-V: Remove x86-isms from architecture
> independent Hyper-V drivers
>
> [This sender failed our fraud detection checks and may not be who they
> appear to be. Learn about spoofing at http://aka.ms/LearnAboutSpoofing]
>
> From: Michael Kelley <mikelley@microsoft.com>
>
> hv_is_hypercall_page_setup() is used to check if Hyper-V is
> initialized, but a 'hypercall page' is an x86 implementation detail
> that isn't necessarily present on other architectures. Rename to the
> architecture independent hv_is_hyperv_initialized(). Use this function
> instead of direct references to x86-specific data structures in
> vmbus_drv.c, and remove 'x86' from the string name passed to
> cpuhp_setup_state().
>
> Signed-off-by: Michael Kelley <mikelley@microsoft.com>
> ---
> arch/x86/hyperv/hv_init.c | 4 ++--
> arch/x86/include/asm/mshyperv.h | 4 ++--
> drivers/hv/hv.c | 2 +-
> drivers/hv/vmbus_drv.c | 5 ++---
> 4 files changed, 7 insertions(+), 8 deletions(-)
>
> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
> index a5db63f728a2..38310bd091c2 100644
> --- a/arch/x86/hyperv/hv_init.c
> +++ b/arch/x86/hyperv/hv_init.c
> @@ -236,7 +236,7 @@ void hyperv_report_panic(struct pt_regs *regs)
> }
> EXPORT_SYMBOL_GPL(hyperv_report_panic);
>
> -bool hv_is_hypercall_page_setup(void)
> +bool hv_is_hyperv_initialized(void)
> {
> union hv_x64_msr_hypercall_contents hypercall_msr;
>
> @@ -249,4 +249,4 @@ bool hv_is_hypercall_page_setup(void)
>
> return true;
> }
> -EXPORT_SYMBOL_GPL(hv_is_hypercall_page_setup);
> +EXPORT_SYMBOL_GPL(hv_is_hyperv_initialized);
> diff --git a/arch/x86/include/asm/mshyperv.h
> b/arch/x86/include/asm/mshyperv.h
> index 530f448fddaf..b001f898ccf3 100644
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -311,11 +311,11 @@ void hyperv_init(void);
> void hyperv_setup_mmu_ops(void);
> void hyper_alloc_mmu(void);
> void hyperv_report_panic(struct pt_regs *regs);
> -bool hv_is_hypercall_page_setup(void);
> +bool hv_is_hyperv_initialized(void);
> void hyperv_cleanup(void);
> #else /* CONFIG_HYPERV */
> static inline void hyperv_init(void) {}
> -static inline bool hv_is_hypercall_page_setup(void) { return false; }
> +static inline bool hv_is_hyperv_initialized(void) { return false; }
> static inline void hyperv_cleanup(void) {}
> static inline void hyperv_setup_mmu_ops(void) {}
> #endif /* CONFIG_HYPERV */
> diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
> index 8267439dd1ee..ebad26053362 100644
> --- a/drivers/hv/hv.c
> +++ b/drivers/hv/hv.c
> @@ -49,7 +49,7 @@ struct hv_context hv_context = {
> */
> int hv_init(void)
> {
> - if (!hv_is_hypercall_page_setup())
> + if (!hv_is_hyperv_initialized())
> return -ENOTSUPP;
>
> hv_context.cpu_context = alloc_percpu(struct hv_per_cpu_context);
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index 1da8e818f4de..12c51dc6bb7b 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -37,7 +37,6 @@
> #include <linux/sched/task_stack.h>
>
> #include <asm/hyperv.h>
> -#include <asm/hypervisor.h>
> #include <asm/mshyperv.h>
> #include <linux/notifier.h>
> #include <linux/ptrace.h>
> @@ -1047,7 +1046,7 @@ static int vmbus_bus_init(void)
> * Initialize the per-cpu interrupt state and
> * connect to the host.
> */
> - ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
> "x86/hyperv:online",
> + ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
> "hyperv/vmbus:online",
> hv_synic_init, hv_synic_cleanup);
> if (ret < 0)
> goto err_alloc;
> @@ -1695,7 +1694,7 @@ static int __init hv_acpi_init(void)
> {
> int ret, t;
>
> - if (x86_hyper != &x86_hyper_ms_hyperv)
> + if (!hv_is_hyperv_initialized())

We are checking to see if we are running on MSFT Hyper-V. This check was added to
deal with situations where Xen/KVM were emulating Hyper-V. It may not be safe to
replace this check with the call to hv_is_hyperv_initialized(). Perhaps we can add a new architecture
independent function to check the hypervisor - something like running_on_mshyperv() that can be used
here.

Regards,

K. Y

> return -ENODEV;
>
> init_completion(&probe_event);
> --
> 2.14.1

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