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Message-ID: <725bac7d-5758-44fd-82cc-29fb85d8c53f@linux.microsoft.com> Date: Tue, 22 Oct 2024 17:51:05 -0700 From: Nuno Das Neves <nunodasneves@...ux.microsoft.com> To: Michael Kelley <mhklinux@...look.com>, "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>, "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, "virtualization@...ts.linux.dev" <virtualization@...ts.linux.dev> Cc: "kys@...rosoft.com" <kys@...rosoft.com>, "haiyangz@...rosoft.com" <haiyangz@...rosoft.com>, "wei.liu@...nel.org" <wei.liu@...nel.org>, "decui@...rosoft.com" <decui@...rosoft.com>, "catalin.marinas@....com" <catalin.marinas@....com>, "will@...nel.org" <will@...nel.org>, "luto@...nel.org" <luto@...nel.org>, "tglx@...utronix.de" <tglx@...utronix.de>, "mingo@...hat.com" <mingo@...hat.com>, "bp@...en8.de" <bp@...en8.de>, "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>, "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>, "seanjc@...gle.com" <seanjc@...gle.com>, "pbonzini@...hat.com" <pbonzini@...hat.com>, "peterz@...radead.org" <peterz@...radead.org>, "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>, "joro@...tes.org" <joro@...tes.org>, "robin.murphy@....com" <robin.murphy@....com>, "davem@...emloft.net" <davem@...emloft.net>, "edumazet@...gle.com" <edumazet@...gle.com>, "kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>, "lpieralisi@...nel.org" <lpieralisi@...nel.org>, "kw@...ux.com" <kw@...ux.com>, "robh@...nel.org" <robh@...nel.org>, "bhelgaas@...gle.com" <bhelgaas@...gle.com>, "arnd@...db.de" <arnd@...db.de>, "sgarzare@...hat.com" <sgarzare@...hat.com>, "jinankjain@...ux.microsoft.com" <jinankjain@...ux.microsoft.com>, "muminulrussell@...il.com" <muminulrussell@...il.com>, "skinsburskii@...ux.microsoft.com" <skinsburskii@...ux.microsoft.com>, "mukeshrathor@...rosoft.com" <mukeshrathor@...rosoft.com> Subject: Re: [PATCH 0/5] Add new headers for Hyper-V Dom0 On 10/10/2024 11:21 AM, Michael Kelley wrote: > From: Nuno Das Neves <nunodasneves@...ux.microsoft.com> Sent: Thursday, October 3, 2024 12:51 PM >>>> An intermediary header "hv_defs.h" is introduced to conditionally >> include either hyperv-tlfs.h or hvhdk.h. This is required because >> several headers which today include hyperv-tlfs.h, are shared >> between Hyper-V and KVM code (e.g. mshyperv.h). > > Have you considered user space code that uses > include/linux/hyperv.h? Which of the two schemes will it use? That code > needs to compile correctly on x86 and ARM64 after your changes. > User space code includes the separate DPDK project, and some of the > tools in the kernel tree under tools/hv. Anything that uses the > uio_hv_generic.c driver falls into this category. > Unless I misunderstand something, the uapi code isn't affected at all by this patch set. e.g. the code in tools/hv uses include/uapi/linux/hyperv.h, which doesn't include any other Hyper-V headers. I'm not aware of how the DPDK project uses the Hyper-V definitions, but if it is getting headers from uapi it should also be unaffected. > I think there's also user space code that is built for vDSO that might pull > in the .h files you are modifying. There are in-progress patches dealing > with vDSO include files, such as [1]. My general comment on vDSO > is to be careful in making #include file changes that it uses, but I'm > not knowledgeable enough on how vDSO is built to give specific > guidance. :-( > Hmm, interesting, looks like it does get used by userspace. The tsc page is mapped into userspace in vdso.vma.c, and read in vdso/gettimeofday.h. That is unexpected for me, since these things aren't in uapi. However I don't anticipate a problem. The definitions used haven't changed, just the headers they are included from. Thanks Nuno > Michael > > [1] https://lore.kernel.org/lkml/20241010135146.181175-1-vincenzo.frascino@arm.com/ > >> >> Summary: >> Patch 1-2: Cleanup patches >> Patch 3: Add the new headers (hvhdk.h, etc..) in include/hyperv/ >> Patch 4: Add hv_defs.h and use it in mshyperv.h, svm.h, >> hyperv_timer.h >> Patch 5: Switch to the new headers, only in Hyper-V code >> >> Nuno Das Neves (5): >> hyperv: Move hv_connection_id to hyperv-tlfs.h >> hyperv: Remove unnecessary #includes >> hyperv: Add new Hyper-V headers >> hyperv: Add hv_defs.h to conditionally include hyperv-tlfs.h or >> hvhdk.h >> hyperv: Use hvhdk.h instead of hyperv-tlfs.h in Hyper-V code >> >> arch/arm64/hyperv/hv_core.c | 3 +- >> arch/arm64/hyperv/mshyperv.c | 1 + >> arch/arm64/include/asm/mshyperv.h | 2 +- >> arch/x86/entry/vdso/vma.c | 1 + >> arch/x86/hyperv/hv_apic.c | 2 +- >> arch/x86/hyperv/hv_init.c | 3 +- >> arch/x86/hyperv/hv_proc.c | 4 +- >> arch/x86/hyperv/hv_spinlock.c | 1 + >> arch/x86/hyperv/hv_vtl.c | 1 + >> arch/x86/hyperv/irqdomain.c | 1 + >> arch/x86/hyperv/ivm.c | 2 +- >> arch/x86/hyperv/mmu.c | 2 +- >> arch/x86/hyperv/nested.c | 2 +- >> arch/x86/include/asm/kvm_host.h | 1 - >> arch/x86/include/asm/mshyperv.h | 3 +- >> arch/x86/include/asm/svm.h | 2 +- >> arch/x86/include/asm/vdso/gettimeofday.h | 1 + >> arch/x86/kernel/cpu/mshyperv.c | 2 +- >> arch/x86/kernel/cpu/mtrr/generic.c | 1 + >> arch/x86/kvm/vmx/vmx_onhyperv.h | 1 - >> arch/x86/mm/pat/set_memory.c | 2 - >> drivers/clocksource/hyperv_timer.c | 2 +- >> drivers/hv/channel.c | 1 + >> drivers/hv/channel_mgmt.c | 1 + >> drivers/hv/connection.c | 1 + >> drivers/hv/hv.c | 1 + >> drivers/hv/hv_balloon.c | 5 +- >> drivers/hv/hv_common.c | 2 +- >> drivers/hv/hv_kvp.c | 1 - >> drivers/hv/hv_snapshot.c | 1 - >> drivers/hv/hv_util.c | 1 + >> drivers/hv/hyperv_vmbus.h | 1 - >> drivers/hv/ring_buffer.c | 1 + >> drivers/hv/vmbus_drv.c | 1 + >> drivers/iommu/hyperv-iommu.c | 1 + >> drivers/net/hyperv/netvsc.c | 1 + >> drivers/pci/controller/pci-hyperv.c | 1 + >> include/asm-generic/hyperv-tlfs.h | 9 + >> include/asm-generic/mshyperv.h | 2 +- >> include/clocksource/hyperv_timer.h | 2 +- >> include/hyperv/hv_defs.h | 29 + >> include/hyperv/hvgdk.h | 66 ++ >> include/hyperv/hvgdk_ext.h | 46 + >> include/hyperv/hvgdk_mini.h | 1212 ++++++++++++++++++++++ >> include/hyperv/hvhdk.h | 733 +++++++++++++ >> include/hyperv/hvhdk_mini.h | 310 ++++++ >> include/linux/hyperv.h | 12 +- >> net/vmw_vsock/hyperv_transport.c | 1 - >> 48 files changed, 2442 insertions(+), 40 deletions(-) >> create mode 100644 include/hyperv/hv_defs.h >> create mode 100644 include/hyperv/hvgdk.h >> create mode 100644 include/hyperv/hvgdk_ext.h >> create mode 100644 include/hyperv/hvgdk_mini.h >> create mode 100644 include/hyperv/hvhdk.h >> create mode 100644 include/hyperv/hvhdk_mini.h >> >> -- >> 2.34.1 >> >
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