linux-kernel - RE: [PATCH 1/6] x86/tdx: Support hypercalls for TDX guests on Hyper-V

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Message-ID: <SA1PR21MB13350DB14A0D6EC943FEF78BBF0C9@SA1PR21MB1335.namprd21.prod.outlook.com>
Date:   Wed, 23 Nov 2022 01:56:20 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     'Dave Hansen' <dave.hansen@...el.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>,
        "Williams, Dan J" <dan.j.williams@...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-arch@...r.kernel.org'" <linux-arch@...r.kernel.org>,
        "'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>,
        "'x86@...nel.org'" <x86@...nel.org>
CC:     "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/6] x86/tdx: Support hypercalls for TDX guests on Hyper-V

> From: Dexuan Cui
> [...]
> The existing asm code for __tdx_hypercall() passes through R10~R15
> (see TDVMCALL_EXPOSE_REGS_MASK) to the (KVM) hypervisor.
> 
> Unluckily, for Hyper-V, we need to pass through RDX, R8, R10 and R11
> to Hyper-V, so I don't think I can use the existing __tdx_hypercall() ?

I'm checking with the Hyper-V team to see if it's possible for them
to not use RDX and R8, and use R12 and R13 instead. Will keep the
thread updated.