linux-kernel - RE: [RFC PATCH V2 07/18] clocksource: hyper-v: decrypt hyperv tsc page in sev-snp enlightened guest

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Date:   Tue, 13 Dec 2022 17:30:06 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Tianyu Lan <ltykernel@...il.com>,
        "luto@...nel.org" <luto@...nel.org>,
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        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
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CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: RE: [RFC PATCH V2 07/18] clocksource: hyper-v: decrypt hyperv tsc
 page in sev-snp enlightened guest

From: Tianyu Lan <ltykernel@...il.com> Sent: Friday, November 18, 2022 7:46 PM
>

Previous patches to the Hyper-V clocksource driver have not been very
consistent in the Subject line prefix, but let's use
"clocksource/drivers/hyper-v:" since it has been used the most.

> Hyper-V tsc page is shared with hypervisor and it should be decrypted
> 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 bb47610bbd1c..aa68eebed5ee 100644
> --- a/drivers/clocksource/hyperv_timer.c
> +++ b/drivers/clocksource/hyperv_timer.c
> @@ -364,7 +364,7 @@ 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);
> 
>  struct ms_hyperv_tsc_page *hv_get_tsc_page(void)
>  {
> --
> 2.25.1