Hi Joerg:
Thanks for your review.
On 8/2/2021 7:53 PM, Joerg Roedel wrote:
On Wed, Jul 28, 2021 at 10:52:16AM -0400, Tianyu Lan wrote:
+static int hyperv_init_ghcb(void)
+{
+ u64 ghcb_gpa;
+ void *ghcb_va;
+ void **ghcb_base;
+
+ if (!ms_hyperv.ghcb_base)
+
On Wed, Jul 28, 2021 at 10:52:16AM -0400, Tianyu Lan wrote:
> +static int hyperv_init_ghcb(void)
> +{
> + u64 ghcb_gpa;
> + void *ghcb_va;
> + void **ghcb_base;
> +
> + if (!ms_hyperv.ghcb_base)
> + return -EINVAL;
> +
> + rdmsrl(MSR_AMD64_SEV_ES_GHCB, ghcb_gpa);
> +
From: Tianyu Lan
Hyper-V exposes GHCB page via SEV ES GHCB MSR for SNP guest
to communicate with hypervisor. Map GHCB page for all
cpus to read/write MSR register and submit hvcall request
via GHCB.
Signed-off-by: Tianyu Lan
---
arch/x86/hyperv/hv_init.c | 73
