linux-kernel - RE: [RFC PATCH V4 02/17] Drivers: hv: vmbus: Decrypt vmbus ring buffer

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Message-ID: <BYAPR21MB1688575EF76512437278B873D79B9@BYAPR21MB1688.namprd21.prod.outlook.com>
Date:   Wed, 12 Apr 2023 14:07:09 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Tianyu Lan <ltykernel@...il.com>,
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Subject: RE: [RFC PATCH V4 02/17] Drivers: hv: vmbus: Decrypt vmbus ring
 buffer

From: Tianyu Lan <ltykernel@...il.com> Sent: Monday, April 3, 2023 10:44 AM
> 
> The ring buffer is remapped in the hv_ringbuffer_init()
> and it should be with decrypt flag in order to share it
> with hypervisor in sev-snp enlightened guest.

This is the wrong commit message and subject for this patch.  The v3 version
of this patch had the correct information about the VP Assist Page.

> 
> Signed-off-by: Tianyu Lan <tiala@...rosoft.com>
> ---
>  arch/x86/hyperv/hv_init.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
> index a5f9474f08e1..9f3e2d71d015 100644
> --- a/arch/x86/hyperv/hv_init.c
> +++ b/arch/x86/hyperv/hv_init.c
> @@ -18,6 +18,7 @@
>  #include <asm/hyperv-tlfs.h>
>  #include <asm/mshyperv.h>
>  #include <asm/idtentry.h>
> +#include <asm/set_memory.h>
>  #include <linux/kexec.h>
>  #include <linux/version.h>
>  #include <linux/vmalloc.h>
> @@ -113,6 +114,11 @@ static int hv_cpu_init(unsigned int cpu)
> 
>  	}
>  	if (!WARN_ON(!(*hvp))) {
> +		if (hv_isolation_type_en_snp()) {
> +			WARN_ON_ONCE(set_memory_decrypted((unsigned long)(*hvp), 1));
> +			memset(*hvp, 0, PAGE_SIZE);
> +		}
> +
>  		msr.enable = 1;
>  		wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, msr.as_uint64);
>  	}
> --
> 2.25.1