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SubjectRE: [PATCH 01/19] x86/hyperv: convert hyperv statuses to linux error codes
Date
> -----Original Message-----
> From: Nuno Das Neves <nunodasneves@linux.microsoft.com>
> Sent: Friday, May 28, 2021 3:43 PM
> To: linux-hyperv@vger.kernel.org; linux-kernel@vger.kernel.org
> Cc: virtualization@lists.linux-foundation.org; Michael Kelley <mikelley@microsoft.com>; viremana@linux.microsoft.com; Sunil
> Muthuswamy <sunilmut@microsoft.com>; wei.liu@kernel.org; vkuznets <vkuznets@redhat.com>; Lillian Grassin-Drake
> <Lillian.GrassinDrake@microsoft.com>; KY Srinivasan <kys@microsoft.com>
> Subject: [PATCH 01/19] x86/hyperv: convert hyperv statuses to linux error codes
>
> Return linux-friendly error codes from hypercall wrapper functions.
> This will be needed in the mshv module.
>
> Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>
> ---
> arch/x86/hyperv/hv_proc.c | 30 ++++++++++++++++++++++++++---
> arch/x86/include/asm/mshyperv.h | 1 +
> include/asm-generic/hyperv-tlfs.h | 32 +++++++++++++++++++++----------
> 3 files changed, 50 insertions(+), 13 deletions(-)
>
> diff --git a/arch/x86/hyperv/hv_proc.c b/arch/x86/hyperv/hv_proc.c
> index 68a0843d4750..59cf9a9e0975 100644
> --- a/arch/x86/hyperv/hv_proc.c
> +++ b/arch/x86/hyperv/hv_proc.c
> @@ -14,6 +14,30 @@
>
> #include <asm/trace/hyperv.h>
>
> +int hv_status_to_errno(u64 hv_status)
> +{
> + switch (hv_result(hv_status)) {
> + case HV_STATUS_SUCCESS:
> + return 0;
> + case HV_STATUS_INVALID_PARAMETER:
> + case HV_STATUS_UNKNOWN_PROPERTY:
> + case HV_STATUS_PROPERTY_VALUE_OUT_OF_RANGE:
> + case HV_STATUS_INVALID_VP_INDEX:
> + case HV_STATUS_INVALID_REGISTER_VALUE:
> + case HV_STATUS_INVALID_LP_INDEX:
> + return -EINVAL;
> + case HV_STATUS_ACCESS_DENIED:
> + case HV_STATUS_OPERATION_DENIED:
> + return -EACCES;
> + case HV_STATUS_NOT_ACKNOWLEDGED:
> + case HV_STATUS_INVALID_VP_STATE:
> + case HV_STATUS_INVALID_PARTITION_STATE:
> + return -EBADFD;
> + }
> + return -ENOTRECOVERABLE;
> +}
> +EXPORT_SYMBOL_GPL(hv_status_to_errno);
> +
> /*
> * See struct hv_deposit_memory. The first u64 is partition ID, the rest
> * are GPAs.
> @@ -94,7 +118,7 @@ int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages)
> local_irq_restore(flags);
> if (!hv_result_success(status)) {
> pr_err("Failed to deposit pages: %lld\n", status);
> - ret = hv_result(status);
> + ret = hv_status_to_errno(status);
> goto err_free_allocations;
> }
>
> @@ -150,7 +174,7 @@ int hv_call_add_logical_proc(int node, u32 lp_index, u32 apic_id)
> if (!hv_result_success(status)) {
> pr_err("%s: cpu %u apic ID %u, %lld\n", __func__,
> lp_index, apic_id, status);
> - ret = hv_result(status);
> + ret = hv_status_to_errno(status);
> }
> break;
> }
> @@ -200,7 +224,7 @@ int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags)
> if (!hv_result_success(status)) {
> pr_err("%s: vcpu %u, lp %u, %lld\n", __func__,
> vp_index, flags, status);
> - ret = hv_result(status);
> + ret = hv_status_to_errno(status);
> }
> break;
> }
> diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
> index 67ff0d637e55..c6eb01f3864d 100644
> --- a/arch/x86/include/asm/mshyperv.h
> +++ b/arch/x86/include/asm/mshyperv.h
> @@ -169,6 +169,7 @@ int hyperv_flush_guest_mapping_range(u64 as,
> int hyperv_fill_flush_guest_mapping_list(
> struct hv_guest_mapping_flush_list *flush,
> u64 start_gfn, u64 end_gfn);
> +int hv_status_to_errno(u64 hv_status);
>
> extern bool hv_root_partition;
>
> diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
> index 515c3fb06ab3..fe6d41d0b114 100644
> --- a/include/asm-generic/hyperv-tlfs.h
> +++ b/include/asm-generic/hyperv-tlfs.h
> @@ -189,16 +189,28 @@ enum HV_GENERIC_SET_FORMAT {
> #define HV_HYPERCALL_REP_START_MASK GENMASK_ULL(59, 48)
>
> /* hypercall status code */
> -#define HV_STATUS_SUCCESS 0
> -#define HV_STATUS_INVALID_HYPERCALL_CODE 2
> -#define HV_STATUS_INVALID_HYPERCALL_INPUT 3
> -#define HV_STATUS_INVALID_ALIGNMENT 4
> -#define HV_STATUS_INVALID_PARAMETER 5
> -#define HV_STATUS_OPERATION_DENIED 8
> -#define HV_STATUS_INSUFFICIENT_MEMORY 11
> -#define HV_STATUS_INVALID_PORT_ID 17
> -#define HV_STATUS_INVALID_CONNECTION_ID 18
> -#define HV_STATUS_INSUFFICIENT_BUFFERS 19
> +#define HV_STATUS_SUCCESS 0x0
> +#define HV_STATUS_INVALID_HYPERCALL_CODE 0x2
> +#define HV_STATUS_INVALID_HYPERCALL_INPUT 0x3
> +#define HV_STATUS_INVALID_ALIGNMENT 0x4
> +#define HV_STATUS_INVALID_PARAMETER 0x5
> +#define HV_STATUS_ACCESS_DENIED 0x6
> +#define HV_STATUS_INVALID_PARTITION_STATE 0x7
> +#define HV_STATUS_OPERATION_DENIED 0x8
> +#define HV_STATUS_UNKNOWN_PROPERTY 0x9
> +#define HV_STATUS_PROPERTY_VALUE_OUT_OF_RANGE 0xA
> +#define HV_STATUS_INSUFFICIENT_MEMORY 0xB
> +#define HV_STATUS_INVALID_PARTITION_ID 0xD
> +#define HV_STATUS_INVALID_VP_INDEX 0xE
> +#define HV_STATUS_NOT_FOUND 0x10
> +#define HV_STATUS_INVALID_PORT_ID 0x11
> +#define HV_STATUS_INVALID_CONNECTION_ID 0x12
> +#define HV_STATUS_INSUFFICIENT_BUFFERS 0x13
> +#define HV_STATUS_NOT_ACKNOWLEDGED 0x14
> +#define HV_STATUS_INVALID_VP_STATE 0x15
> +#define HV_STATUS_NO_RESOURCES 0x1D
> +#define HV_STATUS_INVALID_LP_INDEX 0x41
> +#define HV_STATUS_INVALID_REGISTER_VALUE 0x50
>
> /*
> * The Hyper-V TimeRefCount register and the TSC
> --
> 2.25.1

Reviewed-by: Sunil Muthuswamy <sunilmut@microsoft.com>


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