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Message-ID: <6bc7d41d-2dfc-39ae-6508-b85a78e8e7fa@linux.microsoft.com>
Date: Thu, 4 Mar 2021 10:24:10 -0800
From: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
To: Vitaly Kuznetsov <vkuznets@...hat.com>,
linux-hyperv@...r.kernel.org
Cc: virtualization@...ts.linux-foundation.org,
linux-kernel@...r.kernel.org, mikelley@...rosoft.com,
viremana@...ux.microsoft.com, sunilmut@...rosoft.com,
wei.liu@...nel.org, ligrassi@...rosoft.com, kys@...rosoft.com
Subject: Re: [RFC PATCH 01/18] x86/hyperv: convert hyperv statuses to linux
error codes
On 2/9/2021 5:04 AM, Vitaly Kuznetsov wrote:
> Nuno Das Neves <nunodasneves@...ux.microsoft.com> writes:
>
>> Return linux-friendly error codes from hypercall wrapper functions.
>> This will be needed in the mshv module.
>>
>> Signed-off-by: Nuno Das Neves <nunodasneves@...ux.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 0fd972c9129a..8f86f8e86748 100644
>> --- a/arch/x86/hyperv/hv_proc.c
>> +++ b/arch/x86/hyperv/hv_proc.c
>> @@ -18,6 +18,30 @@
>> #define HV_DEPOSIT_MAX_ORDER (8)
>> #define HV_DEPOSIT_MAX (1 << HV_DEPOSIT_MAX_ORDER)
>>
>> +int hv_status_to_errno(int hv_status)
>> +{
>> + switch (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);
>> +
>> /*
>> * Deposits exact number of pages
>> * Must be called with interrupts enabled
>> @@ -99,7 +123,7 @@ int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages)
>>
>> if (status != HV_STATUS_SUCCESS) {
>> pr_err("Failed to deposit pages: %d\n", status);
>> - ret = status;
>> + ret = -hv_status_to_errno(status);
>
> "-hv_status_to_errno" looks weird, could we just return
> '-EINVAL'/'-EACCES'/... from hv_status_to_errno() instead?
>
Yes, good idea.
>> goto err_free_allocations;
>> }
>>
>> @@ -155,7 +179,7 @@ int hv_call_add_logical_proc(int node, u32 lp_index, u32 apic_id)
>> if (status != HV_STATUS_SUCCESS) {
>> pr_err("%s: cpu %u apic ID %u, %d\n", __func__,
>> lp_index, apic_id, status);
>> - ret = status;
>> + ret = -hv_status_to_errno(status);
>> }
>> break;
>> }
>> @@ -203,7 +227,7 @@ int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags)
>> if (status != HV_STATUS_SUCCESS) {
>> pr_err("%s: vcpu %u, lp %u, %d\n", __func__,
>> vp_index, flags, status);
>> - ret = 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 cbee72550a12..eb75faa4d4c5 100644
>> --- a/arch/x86/include/asm/mshyperv.h
>> +++ b/arch/x86/include/asm/mshyperv.h
>> @@ -243,6 +243,7 @@ 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(int hv_status);
>>
>> extern bool hv_root_partition;
>>
>> diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
>> index dd385c6a71b5..445244192fa4 100644
>> --- a/include/asm-generic/hyperv-tlfs.h
>> +++ b/include/asm-generic/hyperv-tlfs.h
>> @@ -181,16 +181,28 @@ 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
>
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