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Message-ID: <MW4PR21MB200490109062F93EDCBB3DE7C0359@MW4PR21MB2004.namprd21.prod.outlook.com>
Date: Thu, 10 Jun 2021 18:42:17 +0000
From: Sunil Muthuswamy <sunilmut@...rosoft.com>
To: Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: "virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
Michael Kelley <mikelley@...rosoft.com>,
"viremana@...ux.microsoft.com" <viremana@...ux.microsoft.com>,
"wei.liu@...nel.org" <wei.liu@...nel.org>,
vkuznets <vkuznets@...hat.com>,
Lillian Grassin-Drake <Lillian.GrassinDrake@...rosoft.com>,
KY Srinivasan <kys@...rosoft.com>
Subject: RE: [PATCH 02/19] asm-generic/hyperv: convert hyperv statuses to
strings
> -----Original Message-----
> From: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
> Sent: Friday, May 28, 2021 3:43 PM
> To: linux-hyperv@...r.kernel.org; linux-kernel@...r.kernel.org
> Cc: virtualization@...ts.linux-foundation.org; Michael Kelley <mikelley@...rosoft.com>; viremana@...ux.microsoft.com; Sunil
> Muthuswamy <sunilmut@...rosoft.com>; wei.liu@...nel.org; vkuznets <vkuznets@...hat.com>; Lillian Grassin-Drake
> <Lillian.GrassinDrake@...rosoft.com>; KY Srinivasan <kys@...rosoft.com>
> Subject: [PATCH 02/19] asm-generic/hyperv: convert hyperv statuses to strings
>
> Allow hyperv hypercall failures to be debugged more easily with dmesg.
> This will be used in the mshv module.
>
> Signed-off-by: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
> ---
> arch/x86/hyperv/hv_init.c | 2 +-
> arch/x86/hyperv/hv_proc.c | 10 +++---
> include/asm-generic/hyperv-tlfs.h | 52 ++++++++++++++++++-------------
> include/asm-generic/mshyperv.h | 8 +++++
> 4 files changed, 44 insertions(+), 28 deletions(-)
>
> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
> index bb0ae4b5c00f..722bafdb2225 100644
> --- a/arch/x86/hyperv/hv_init.c
> +++ b/arch/x86/hyperv/hv_init.c
> @@ -349,7 +349,7 @@ static void __init hv_get_partition_id(void)
> status = hv_do_hypercall(HVCALL_GET_PARTITION_ID, NULL, output_page);
> if (!hv_result_success(status)) {
> /* No point in proceeding if this failed */
> - pr_err("Failed to get partition ID: %lld\n", status);
> + pr_err("Failed to get partition ID: %s\n", hv_status_to_string(status));
> BUG();
> }
> hv_current_partition_id = output_page->partition_id;
> diff --git a/arch/x86/hyperv/hv_proc.c b/arch/x86/hyperv/hv_proc.c
> index 59cf9a9e0975..30951e778577 100644
> --- a/arch/x86/hyperv/hv_proc.c
> +++ b/arch/x86/hyperv/hv_proc.c
> @@ -117,7 +117,7 @@ int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages)
> page_count, 0, input_page, NULL);
> local_irq_restore(flags);
> if (!hv_result_success(status)) {
> - pr_err("Failed to deposit pages: %lld\n", status);
> + pr_err("Failed to deposit pages: %s\n", hv_status_to_string(status));
> ret = hv_status_to_errno(status);
> goto err_free_allocations;
> }
> @@ -172,8 +172,8 @@ int hv_call_add_logical_proc(int node, u32 lp_index, u32 apic_id)
>
> if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
> if (!hv_result_success(status)) {
> - pr_err("%s: cpu %u apic ID %u, %lld\n", __func__,
> - lp_index, apic_id, status);
> + pr_err("%s: cpu %u apic ID %u, %s\n", __func__,
> + lp_index, apic_id, hv_status_to_string(status));
> ret = hv_status_to_errno(status);
> }
> break;
> @@ -222,8 +222,8 @@ int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags)
>
> if (hv_result(status) != HV_STATUS_INSUFFICIENT_MEMORY) {
> if (!hv_result_success(status)) {
> - pr_err("%s: vcpu %u, lp %u, %lld\n", __func__,
> - vp_index, flags, status);
> + pr_err("%s: vcpu %u, lp %u, %s\n", __func__,
> + vp_index, flags, hv_status_to_string(status));
> ret = hv_status_to_errno(status);
> }
> break;
> diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
> index fe6d41d0b114..40ff7cdd4a2b 100644
> --- a/include/asm-generic/hyperv-tlfs.h
> +++ b/include/asm-generic/hyperv-tlfs.h
> @@ -189,28 +189,36 @@ enum HV_GENERIC_SET_FORMAT {
> #define HV_HYPERCALL_REP_START_MASK GENMASK_ULL(59, 48)
>
> /* hypercall status code */
> -#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
> +#define __HV_STATUS_DEF(OP) \
> + OP(HV_STATUS_SUCCESS, 0x0) \
> + OP(HV_STATUS_INVALID_HYPERCALL_CODE, 0x2) \
> + OP(HV_STATUS_INVALID_HYPERCALL_INPUT, 0x3) \
> + OP(HV_STATUS_INVALID_ALIGNMENT, 0x4) \
> + OP(HV_STATUS_INVALID_PARAMETER, 0x5) \
> + OP(HV_STATUS_ACCESS_DENIED, 0x6) \
> + OP(HV_STATUS_INVALID_PARTITION_STATE, 0x7) \
> + OP(HV_STATUS_OPERATION_DENIED, 0x8) \
> + OP(HV_STATUS_UNKNOWN_PROPERTY, 0x9) \
> + OP(HV_STATUS_PROPERTY_VALUE_OUT_OF_RANGE, 0xA) \
> + OP(HV_STATUS_INSUFFICIENT_MEMORY, 0xB) \
> + OP(HV_STATUS_INVALID_PARTITION_ID, 0xD) \
> + OP(HV_STATUS_INVALID_VP_INDEX, 0xE) \
> + OP(HV_STATUS_NOT_FOUND, 0x10) \
> + OP(HV_STATUS_INVALID_PORT_ID, 0x11) \
> + OP(HV_STATUS_INVALID_CONNECTION_ID, 0x12) \
> + OP(HV_STATUS_INSUFFICIENT_BUFFERS, 0x13) \
> + OP(HV_STATUS_NOT_ACKNOWLEDGED, 0x14) \
> + OP(HV_STATUS_INVALID_VP_STATE, 0x15) \
> + OP(HV_STATUS_NO_RESOURCES, 0x1D) \
> + OP(HV_STATUS_INVALID_LP_INDEX, 0x41) \
> + OP(HV_STATUS_INVALID_REGISTER_VALUE, 0x50)
> +
> +#define __HV_MAKE_HV_STATUS_ENUM(NAME, VAL) NAME = (VAL),
> +#define __HV_MAKE_HV_STATUS_CASE(NAME, VAL) case (NAME): return (#NAME);
> +
> +enum hv_status {
> + __HV_STATUS_DEF(__HV_MAKE_HV_STATUS_ENUM)
> +};
>
> /*
> * The Hyper-V TimeRefCount register and the TSC
> diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
> index 9a000ba2bb75..21fb71ca1ba9 100644
> --- a/include/asm-generic/mshyperv.h
> +++ b/include/asm-generic/mshyperv.h
> @@ -59,6 +59,14 @@ static inline unsigned int hv_repcomp(u64 status)
> HV_HYPERCALL_REP_COMP_OFFSET;
> }
>
> +static inline const char *hv_status_to_string(u64 hv_status)
> +{
> + switch (hv_result(hv_status)) {
> + __HV_STATUS_DEF(__HV_MAKE_HV_STATUS_CASE)
> + default : return "Unknown";
> + }
> +}
Wouldn't this be a big switch statement that will get duplicated all over the place
in the code because of the inline (and also the strings within)?
- Sunil
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