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Message-ID: <BYAPR21MB16889E3C1EA35BC8D248959ED71DA@BYAPR21MB1688.namprd21.prod.outlook.com>
Date:   Thu, 24 Aug 2023 14:06:42 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Dexuan Cui <decui@...rosoft.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "arnd@...db.de" <arnd@...db.de>, "bp@...en8.de" <bp@...en8.de>,
        "brijesh.singh@....com" <brijesh.singh@....com>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "dave.hansen@...el.com" <dave.hansen@...el.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "jane.chu@...cle.com" <jane.chu@...cle.com>,
        "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        KY Srinivasan <kys@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "luto@...nel.org" <luto@...nel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "sathyanarayanan.kuppuswamy@...ux.intel.com" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "seanjc@...gle.com" <seanjc@...gle.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>, jason <jason@...c4.com>,
        "nik.borisov@...e.com" <nik.borisov@...e.com>
CC:     "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "rick.p.edgecombe@...el.com" <rick.p.edgecombe@...el.com>,
        Anthony Davis <andavis@...hat.com>,
        Mark Heslin <mheslin@...hat.com>,
        vkuznets <vkuznets@...hat.com>,
        "xiaoyao.li@...el.com" <xiaoyao.li@...el.com>
Subject: RE: [PATCH v3 06/10] x86/hyperv: Introduce a global variable
 hyperv_paravisor_present

From: Dexuan Cui <decui@...rosoft.com> Sent: Thursday, August 24, 2023 1:07 AM
> 
> The new variable hyperv_paravisor_present is set only when the VM
> is a SNP/TDX VM with the paravisor running: see ms_hyperv_init_platform().
> 
> We introduce hyperv_paravisor_present because we can not use
> ms_hyperv.paravisor_present in arch/x86/include/asm/mshyperv.h:
> 
> struct ms_hyperv_info is defined in include/asm-generic/mshyperv.h, which
> is included at the end of arch/x86/include/asm/mshyperv.h, but at the
> beginning of arch/x86/include/asm/mshyperv.h, we would already need to use
> struct ms_hyperv_info in hv_do_hypercall().
> 
> We use hyperv_paravisor_present only in include/asm-generic/mshyperv.h,
> and use ms_hyperv.paravisor_present elsewhere. In the future, we'll
> introduce a hypercall function structure for different VM types, and
> at boot time, the right function pointers would be written into the
> structure so that runtime testing of TDX vs. SNP vs. normal will be
> avoided and hyperv_paravisor_present will no longer be needed.
> 
> Call hv_vtom_init() when it's a VBS VM or when ms_hyperv.paravisor_present
> is true, i.e. the VM is a SNP VM or TDX VM with the paravisor.
> 
> Enhance hv_vtom_init() for a TDX VM with the paravisor.
> 
> In hv_common_cpu_init(), don't decrypt the hyperv_pcpu_input_arg
> for a TDX VM with the paravisor, just like we don't decrypt the page
> for a SNP VM with the paravisor.
> 
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> ---
> 
> Changes in v2: None
> 
> Changes in v3:
>   Improved the changelog
>   Use ms_hyperv.paravisor_present in general and only use
>     hyperv_paravisor_present in arch/x86/include/asm/mshyperv.h
>   Fixed the build when CONFIG_AMD_MEM_ENCRYPT and/or
>      CONFIG_INTEL_TDX_GUEST are not set.
>   Updated arch/x86/include/asm/mshyperv.h accordingly
>   hv_vtom_init(): Fixed/added the comments
>   Handled the TDX special case directly in vmbus_set_event().
> 
>  arch/x86/hyperv/hv_init.c       |  4 ++--
>  arch/x86/hyperv/ivm.c           | 38 ++++++++++++++++++++++++++++++---
>  arch/x86/include/asm/mshyperv.h | 15 ++++++++-----
>  arch/x86/kernel/cpu/mshyperv.c  |  9 ++++++--
>  drivers/hv/connection.c         | 15 +++++++++----
>  drivers/hv/hv.c                 | 10 ++++-----
>  drivers/hv/hv_common.c          |  3 ++-
>  7 files changed, 72 insertions(+), 22 deletions(-)

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>

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