linux-kernel - RE: [PATCH V5 6/8] clocksource: hyper-v: Mark hyperv tsc page unencrypted in sev-snp enlightened guest

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Message-ID: <SA1PR21MB13351211BB7EFC2AEEC33CEABF10A@SA1PR21MB1335.namprd21.prod.outlook.com>
Date:   Fri, 11 Aug 2023 00:14:06 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Tianyu Lan <ltykernel@...il.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...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>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
CC:     Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        vkuznets <vkuznets@...hat.com>,
        "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
Subject: RE: [PATCH V5 6/8] clocksource: hyper-v: Mark hyperv tsc page
 unencrypted in sev-snp enlightened guest

> From: Tianyu Lan <ltykernel@...il.com>
> Sent: Thursday, August 10, 2023 9:04 AM
> [...]
> Hyper-V tsc page is shared with hypervisor and mark the page
> unencrypted in sev-snp enlightened guest when it's used.
> 
> Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
> Signed-off-by: Tianyu Lan <tiala@...rosoft.com>

Reviewed-by: Dexuan Cui <decui@...rosoft.com>

FWIW, it looks like __bss_decrypted is ignored in the case of
TDX. I'll get it to work for TDX in future.