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SubjectRe: [PATCH 1/2] Drivers: hv: vmbus: Remove x86-isms from arch independent drivers
On Tue, Nov 14, 2017 at 10:52:07AM -0700, kys@exchange.microsoft.com wrote:
> 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() and add check
> that x86_hyper is pointing to Hyper-V. Use this function instead of
> direct references to x86-specific data structures in vmbus_drv.c,
> and remove now redundant call in hv_init(). Also remove 'x86' from
> the string name passed to cpuhp_setup_state().
>
> Signed-off-by: Michael Kelley <mikelley@microsoft.com>
> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
> ---
> arch/x86/hyperv/hv_init.c | 21 ++++++++++++++-------
> arch/x86/include/asm/mshyperv.h | 4 ++--
> drivers/hv/hv.c | 3 ---
> drivers/hv/vmbus_drv.c | 5 ++---
> 4 files changed, 18 insertions(+), 15 deletions(-)
>
> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
> index aeb8edf..e5372c9 100644
> --- a/arch/x86/hyperv/hv_init.c
> +++ b/arch/x86/hyperv/hv_init.c
> @@ -239,17 +239,24 @@ void hyperv_report_panic(struct pt_regs *regs, long err)
> }
> 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;
>
> - /* Check if the hypercall page is setup */
> + /*
> + * Ensure that we're really on Hyper-V, and not a KVM or Xen
> + * emulation of Hyper-V
> + */
> + if (x86_hyper != &x86_hyper_ms_hyperv)
> + return false;
> +
> + /*
> + * Verify that earlier initialization succeeded by checking
> + * that the hypercall page is setup
> + */
> hypercall_msr.as_uint64 = 0;
> rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
>
> - if (!hypercall_msr.enable)
> - return false;
> -
> - return true;
> + return hypercall_msr.enable;
> }
> -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 bd89104..740dc97 100644
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -311,11 +311,11 @@ static inline int hv_cpu_number_to_vp_number(int cpu_number)
> void hyperv_setup_mmu_ops(void);
> void hyper_alloc_mmu(void);
> void hyperv_report_panic(struct pt_regs *regs, long err);
> -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 8267439..fe96aab 100644
> --- a/drivers/hv/hv.c
> +++ b/drivers/hv/hv.c
> @@ -49,9 +49,6 @@ struct hv_context hv_context = {
> */
> int hv_init(void)
> {
> - if (!hv_is_hypercall_page_setup())
> - return -ENOTSUPP;
> -
> hv_context.cpu_context = alloc_percpu(struct hv_per_cpu_context);
> if (!hv_context.cpu_context)
> return -ENOMEM;
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index 4f3faf5..398643b 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>
> @@ -1053,7 +1052,7 @@ 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;
> @@ -1717,7 +1716,7 @@ static int __init hv_acpi_init(void)
> {
> int ret, t;
>
> - if (x86_hyper != &x86_hyper_ms_hyperv)
> + if (!hv_is_hyperv_initialized())
> return -ENODEV;
>
> init_completion(&probe_event);
> --
> 1.7.1


Does not apply to 4.15-rc1 :(

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