linux-kernel - RE: [PATCH 9/9] x86/hyperv: Remove hv_isolation_type_en

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Date:   Wed, 16 Aug 2023 04:14:03 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "arnd@...db.de" <arnd@...db.de>, "bp@...en8.de" <bp@...en8.de>,
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        Haiyang Zhang <haiyangz@...rosoft.com>,
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        KY Srinivasan <kys@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
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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>,
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        Anthony Davis <andavis@...hat.com>,
        Mark Heslin <mheslin@...hat.com>,
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        "xiaoyao.li@...el.com" <xiaoyao.li@...el.com>
Subject: RE: [PATCH 9/9] x86/hyperv: Remove hv_isolation_type_en_snp

> From: Dexuan Cui <decui@...rosoft.com>
> Sent: Friday, August 11, 2023 3:19 PM
> To: ak@...ux.intel.com; arnd@...db.de; bp@...en8.de;
> ...
> In ms_hyperv_init_platform(), do not distinguish between a SNP VM with
> the paravisor and a SNP VM without the paravisor.
> 
> Replace hv_isolation_type_en_snp() with
> !hyperv_paravisor_present && hv_isolation_type_snp().
> 
> The hv_isolation_type_en_snp() in drivers/hv/hv.c and
> drivers/hv/hv_common.c can be changed to hv_isolation_type_snp() since
> we know !hyperv_paravisor_present is true there.
> 
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>

Some of the existing hv_isolation_type_snp()'s need to test 
hyperv_paravisor_present as well, e.g.

diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
@@ -52,7 +52,7 @@ static int hyperv_init_ghcb(void)
 	void *ghcb_va;
 	void **ghcb_base;
 
-	if (!hv_isolation_type_snp())
+	if (!hyperv_paravisor_present || !hv_isolation_type_snp())
 		return 0;
 
 	if (!hv_ghcb_pg)

The new version of this patch is here:
https://github.com/dcui/tdx/commit/323de396984e3c222ded23dce46155ae48a1992a

After Tianyu posts his v6 of the fully enlightened SNP patchset,
I'll rebase to his patchset and post v2.