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Message-ID: <ea332855-fed0-d44a-267f-d2274032b1ac@amd.com>
Date: Mon, 7 Jun 2021 09:58:30 -0500
From: Brijesh Singh <brijesh.singh@....com>
To: Borislav Petkov <bp@...en8.de>
Cc: brijesh.singh@....com, x86@...nel.org,
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npmccallum@...hat.com
Subject: Re: [PATCH Part1 RFC v3 05/22] x86/sev: Add support for hypervisor
feature VMGEXIT
On 6/7/21 9:19 AM, Borislav Petkov wrote:
> On Wed, Jun 02, 2021 at 09:03:59AM -0500, Brijesh Singh wrote:
>> diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c
>> index 70f181f20d92..94957c5bdb51 100644
>> --- a/arch/x86/kernel/sev-shared.c
>> +++ b/arch/x86/kernel/sev-shared.c
> I'm guessing this is in sev-shared.c because it is going to be used by
> both stages?
Yes, the function is used by both the stages.
>> @@ -20,6 +20,7 @@
>> * out when the .bss section is later cleared.
>> */
>> static u16 ghcb_version __section(".data");
> State what this is:
>
> /* Bitmap of SEV features supported by the hypervisor */
Noted.
>
>> +static u64 hv_features __section(".data");
> Also, I'm assuming that bitmap remains immutable during the guest
> lifetime so you can do:
>
> static u64 hv_features __ro_after_init;
>
> instead, which will do:
>
> static u64 hv_features __attribute__((__section__(".data..ro_after_init")));
>
> and it'll be in the data section and then also marked read-only after
> init, after mark_rodata_ro() more specifically.
Yes, it should be immutable. I will set the ro_after_init section to
mark it read-only. thanks
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