linux-kernel - RE: [PATCH V2 6/9] clocksource: hyper-v: Mark hyperv tsc page unencrypted in sev-snp enlightened guest

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Message-ID: <BYAPR21MB16885F935CCFAA000BE04992D72EA@BYAPR21MB1688.namprd21.prod.outlook.com>
Date:   Tue, 4 Jul 2023 14:19:59 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...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>,
        Dexuan Cui <decui@...rosoft.com>,
        "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>
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@...hat.com" <vkuznets@...hat.com>
Subject: RE: [PATCH V2 6/9] clocksource: hyper-v: Mark hyperv tsc page
 unencrypted in sev-snp enlightened guest

From: Tianyu Lan <ltykernel@...il.com> Sent: Monday, June 26, 2023 8:23 PM
> 
> Hyper-V tsc page is shared with hypervisor and mark the page
> unencrypted in sev-snp enlightened guest when it's used.
> 
> Signed-off-by: Tianyu Lan <tiala@...rosoft.com>
> ---
>  drivers/clocksource/hyperv_timer.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
> index bcd9042a0c9f..66e29a19770b 100644
> --- a/drivers/clocksource/hyperv_timer.c
> +++ b/drivers/clocksource/hyperv_timer.c
> @@ -376,7 +376,7 @@ EXPORT_SYMBOL_GPL(hv_stimer_global_cleanup);
>  static union {
>  	struct ms_hyperv_tsc_page page;
>  	u8 reserved[PAGE_SIZE];
> -} tsc_pg __aligned(PAGE_SIZE);
> +} tsc_pg __bss_decrypted __aligned(PAGE_SIZE);
> 
>  static struct ms_hyperv_tsc_page *tsc_page = &tsc_pg.page;
>  static unsigned long tsc_pfn;
> --
> 2.25.1

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