On Tue, Jun 14, 2022 at 04:50:36PM +0000, Michael Kelley (LINUX) wrote:
> From: Tianyu Lan <ltykernel@xxxxxxxxx> Sent: Monday, June 13, 2022 6:46 PM
> >
> > Hyper-V Isolation VM current code uses sev_es_ghcb_hv_call()
> > to read/write MSR via GHCB page and depends on the sev code.
> > This may cause regression when sev code changes interface
> > design.
> >
> > The latest SEV-ES code requires to negotiate GHCB version before
> > reading/writing MSR via GHCB page and sev_es_ghcb_hv_call() doesn't
> > work for Hyper-V Isolation VM. Add Hyper-V ghcb related implementation
> > to decouple SEV and Hyper-V code. Negotiate GHCB version in the
> > hyperv_init() and use the version to communicate with Hyper-V
> > in the ghcb hv call function.
> >
> > Fixes: 2ea29c5abbc2 ("x86/sev: Save the negotiated GHCB version")
> > Signed-off-by: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>
> > ---
> > Change since v1:
> > - Negotiate ghcb version in Hyper-V init.
> > - use native_wrmsrl() instead of native_wrmsr() in the
> > wr_ghcb_msr().
> > ---
> > arch/x86/hyperv/hv_init.c | 6 +++
> > arch/x86/hyperv/ivm.c | 84 ++++++++++++++++++++++++++++++---
> > arch/x86/include/asm/mshyperv.h | 4 ++
> > 3 files changed, 88 insertions(+), 6 deletions(-)
> >
>
> Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
>
Applied to hyperv-fixes. Thanks.
