From: Michael Kelley <mikelley@xxxxxxxxxxxxx> Sent: Friday, August 13, 2021 12:31 PM
> To: Tianyu Lan <ltykernel@xxxxxxxxx>; KY Srinivasan <kys@xxxxxxxxxxxxx>; Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>;
> Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>; wei.liu@xxxxxxxxxx; Dexuan Cui <decui@xxxxxxxxxxxxx>;
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> Subject: RE: [PATCH V3 05/13] HV: Add Write/Read MSR registers via ghcb page
>
> From: Tianyu Lan <ltykernel@xxxxxxxxx> Sent: Monday, August 9, 2021 10:56 AM
> > Subject: [PATCH V3 05/13] HV: Add Write/Read MSR registers via ghcb page
>
> See previous comments about tag in the Subject line.
>
> > Hyper-V provides GHCB protocol to write Synthetic Interrupt
> > Controller MSR registers in Isolation VM with AMD SEV SNP
> > and these registers are emulated by hypervisor directly.
> > Hyper-V requires to write SINTx MSR registers twice. First
> > writes MSR via GHCB page to communicate with hypervisor
> > and then writes wrmsr instruction to talk with paravisor
> > which runs in VMPL0. Guest OS ID MSR also needs to be set
> > via GHCB.
> >
> > Signed-off-by: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>
> > ---
> > Change since v1:
> > * Introduce sev_es_ghcb_hv_call_simple() and share code
> > between SEV and Hyper-V code.
> > ---
> > arch/x86/hyperv/hv_init.c | 33 ++-------
> > arch/x86/hyperv/ivm.c | 110 +++++++++++++++++++++++++++++
> > arch/x86/include/asm/mshyperv.h | 78 +++++++++++++++++++-
> > arch/x86/include/asm/sev.h | 3 +
> > arch/x86/kernel/cpu/mshyperv.c | 3 +
> > arch/x86/kernel/sev-shared.c | 63 ++++++++++-------
> > drivers/hv/hv.c | 121 ++++++++++++++++++++++----------
> > include/asm-generic/mshyperv.h | 12 +++-
> > 8 files changed, 329 insertions(+), 94 deletions(-)
> >
> > diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
> > index b3683083208a..ab0b33f621e7 100644
> > --- a/arch/x86/hyperv/hv_init.c
> > +++ b/arch/x86/hyperv/hv_init.c
> > @@ -423,7 +423,7 @@ void __init hyperv_init(void)
> > goto clean_guest_os_id;
> >
> > if (hv_isolation_type_snp()) {
> > - ms_hyperv.ghcb_base = alloc_percpu(void *);
> > + ms_hyperv.ghcb_base = alloc_percpu(union hv_ghcb __percpu *);
>
> union hv_ghcb isn't defined. It is not added until patch 6 of the series.
>
Ignore this comment. My mistake.
Michael
