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Add asm-generic/hyperv-defs.h Content-Language: en-US To: Wei Liu Cc: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-arch@vger.kernel.org, mikelley@microsoft.com, kys@microsoft.com, haiyangz@microsoft.com, decui@microsoft.com, ssengar@linux.microsoft.com, mukeshrathor@microsoft.com, stanislav.kinsburskiy@gmail.com, jinankjain@linux.microsoft.com, apais@linux.microsoft.com, Tianyu.Lan@microsoft.com, vkuznets@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, will@kernel.org, catalin.marinas@arm.com References: <1690487690-2428-1-git-send-email-nunodasneves@linux.microsoft.com> <1690487690-2428-15-git-send-email-nunodasneves@linux.microsoft.com> From: Nuno Das Neves In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230817_094148_097806_9CA30544 X-CRM114-Status: GOOD ( 24.10 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 8/2/2023 5:48 PM, Wei Liu wrote: > On Thu, Jul 27, 2023 at 12:54:49PM -0700, Nuno Das Neves wrote: >> In order to keep unstable hyper-v interfaces independent of >> hyperv-tlfs.h, hvhdk.h must replace hyperv-tlfs.h eveywhere it will be >> used in the mshv driver. > > Please properly capitalize "Hyper-V" when it is used as a term. > Will fix, thanks. >> Add hyperv-defs.h to replace some inclusions of hyperv-tlfs.h. >> It includes hyperv-tlfs.h or hvhdk.h depending on a compile-time constant >> HV_HYPERV_DEFS which will be defined in the mshv driver. >> >> Signed-off-by: Nuno Das Neves >> --- >> arch/arm64/include/asm/mshyperv.h | 2 +- >> arch/x86/include/asm/mshyperv.h | 3 +-- >> drivers/hv/hyperv_vmbus.h | 1 - >> include/asm-generic/hyperv-defs.h | 26 ++++++++++++++++++++++++++ >> include/asm-generic/mshyperv.h | 2 +- >> include/linux/hyperv.h | 2 +- >> 6 files changed, 30 insertions(+), 6 deletions(-) >> create mode 100644 include/asm-generic/hyperv-defs.h >> > [...] >> diff --git a/include/asm-generic/hyperv-defs.h b/include/asm-generic/hyperv-defs.h >> new file mode 100644 >> index 000000000000..ac6fcba35c8c >> --- /dev/null >> +++ b/include/asm-generic/hyperv-defs.h >> @@ -0,0 +1,26 @@ >> +/* SPDX-License-Identifier: GPL-2.0 */ >> +#ifndef _ASM_GENERIC_HYPERV_DEFS_H >> +#define _ASM_GENERIC_HYPERV_DEFS_H >> + >> +/* >> + * There are cases where Microsoft Hypervisor ABIs are needed which may not be >> + * stable or present in the Hyper-V TLFS document. E.g. the mshv_root driver. >> + * >> + * As these interfaces are unstable and may differ from hyperv-tlfs.h, they >> + * must be kept separate and independent. >> + * >> + * However, code from files that depend on hyperv-tlfs.h (such as mshyperv.h) >> + * is still needed, so work around the issue by conditionally including the >> + * correct definitions. >> + * >> + * Note: Since they are independent of each other, there are many definitions >> + * duplicated in both hyperv-tlfs.h and uapi/hyperv/hv*.h files. >> + */ > > Is this because we accidentally introduced some host only, unstable > interfaces to hyperv-tlfs.h? Is the long term plan to drop those from > hyperv-tlfs.h and further separate the helper functions? > > Thanks, > Wei. > We do have some host-only interfaces in hyperv-tlfs.h that should not be there. E.g. the create LP/VP hypercall inputs. We should drop them. However, even if we fix that problem, the new headers still have conflicting definitions, so need to be independent. E.g. enum hv_message_type has many more members in the new headers. We don't want to put anything not in the TLFS doc into hyperv-tlfs.h, even if it can be ignored by the guest code. >> +#ifdef HV_HYPERV_DEFS >> +#include >> +#else >> +#include >> +#endif >> + >> +#endif /* _ASM_GENERIC_HYPERV_DEFS_H */ >> + >> diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h >> index 2b20994d809e..e86b6f51fb64 100644 >> --- a/include/asm-generic/mshyperv.h >> +++ b/include/asm-generic/mshyperv.h >> @@ -25,7 +25,7 @@ >> #include >> #include >> #include >> -#include >> +#include >> >> #define VTPM_BASE_ADDRESS 0xfed40000 >> >> diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h >> index f90de5abcd50..66ed8b3e5d89 100644 >> --- a/include/linux/hyperv.h >> +++ b/include/linux/hyperv.h >> @@ -24,7 +24,7 @@ >> #include >> #include >> #include >> -#include >> +#include >> >> #define MAX_PAGE_BUFFER_COUNT 32 >> #define MAX_MULTIPAGE_BUFFER_COUNT 32 /* 128K */ >> -- >> 2.25.1 >> _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel