Re: [RFC PATCH V3 12/16] x86/sev: Add a #HV exception handler

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To: "Gupta, Pankaj" <pankaj.gupta@xxxxxxx>, luto@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, bp@xxxxxxxxx, dave.hansen@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, hpa@xxxxxxxxx, seanjc@xxxxxxxxxx, pbonzini@xxxxxxxxxx, jgross@xxxxxxxx, tiala@xxxxxxxxxxxxx, kirill@xxxxxxxxxxxxx, jiangshan.ljs@xxxxxxxxxxxx, peterz@xxxxxxxxxxxxx, ashish.kalra@xxxxxxx, srutherford@xxxxxxxxxx, akpm@xxxxxxxxxxxxxxxxxxxx, anshuman.khandual@xxxxxxx, pawan.kumar.gupta@xxxxxxxxxxxxxxx, adrian.hunter@xxxxxxxxx, daniel.sneddon@xxxxxxxxxxxxxxx, alexander.shishkin@xxxxxxxxxxxxxxx, sandipan.das@xxxxxxx, ray.huang@xxxxxxx, brijesh.singh@xxxxxxx, michael.roth@xxxxxxx, thomas.lendacky@xxxxxxx, venu.busireddy@xxxxxxxxxx, sterritt@xxxxxxxxxx, tony.luck@xxxxxxxxx, samitolvanen@xxxxxxxxxx, fenghua.yu@xxxxxxxxx
Subject: Re: [RFC PATCH V3 12/16] x86/sev: Add a #HV exception handler
From: Tianyu Lan <ltykernel@xxxxxxxxx>
Date: Fri, 3 Feb 2023 15:27:11 +0800
Cc: linux-kernel@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx
In-reply-to: <0098b974-7ceb-664a-aa53-afac8cc26d47@amd.com>
References: <20230122024607.788454-1-ltykernel@gmail.com> <20230122024607.788454-13-ltykernel@gmail.com> <0098b974-7ceb-664a-aa53-afac8cc26d47@amd.com>
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On 1/23/2023 3:33 PM, Gupta, Pankaj wrote:

+ */
+.macro idtentry_hv vector asmsym cfunc
+SYM_CODE_START(\asmsym)
+    UNWIND_HINT_IRET_REGS
+    ASM_CLAC


Did you get a chance to review the new instructions
added at the start similar to idtentry_vc and comments
added assuggested here?

https://lore.kernel.org/lkml/16e50239-39b2-4fb4-5110-18f13ba197fe@xxxxxxx/


Hi Pankaj:

Thanks for your reminder. Yes, CLD should be add after ASM_CLAC. Willfix it.

Follow-Ups:
- Re: [RFC PATCH V3 12/16] x86/sev: Add a #HV exception handler
  - From: Gupta, Pankaj

References:
- [RFC PATCH V3 00/16] x86/hyperv/sev: Add AMD sev-snp enlightened guest support on hyperv
  - From: Tianyu Lan
- [RFC PATCH V3 12/16] x86/sev: Add a #HV exception handler
  - From: Tianyu Lan
- Re: [RFC PATCH V3 12/16] x86/sev: Add a #HV exception handler
  - From: Gupta, Pankaj

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