From: Tianyu Lan <ltykernel@xxxxxxxxx> Sent: Monday, June 26, 2023 8:23 PM
>
> Add Hyperv-specific handling for faults caused by VMMCALL
> instructions.
>
> Signed-off-by: Tianyu Lan <tiala@xxxxxxxxxxxxx>
> ---
> arch/x86/kernel/cpu/mshyperv.c | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
> index 8e1d9ed6a1e0..ba9a3a65f664 100644
> --- a/arch/x86/kernel/cpu/mshyperv.c
> +++ b/arch/x86/kernel/cpu/mshyperv.c
> @@ -32,6 +32,7 @@
> #include <asm/nmi.h>
> #include <clocksource/hyperv_timer.h>
> #include <asm/numa.h>
> +#include <asm/svm.h>
>
> /* Is Linux running as the root partition? */
> bool hv_root_partition;
> @@ -577,6 +578,20 @@ static bool __init ms_hyperv_msi_ext_dest_id(void)
> return eax & HYPERV_VS_PROPERTIES_EAX_EXTENDED_IOAPIC_RTE;
> }
>
> +static void hv_sev_es_hcall_prepare(struct ghcb *ghcb, struct pt_regs *regs)
> +{
> + /* RAX and CPL are already in the GHCB */
> + ghcb_set_rcx(ghcb, regs->cx);
> + ghcb_set_rdx(ghcb, regs->dx);
> + ghcb_set_r8(ghcb, regs->r8);
> +}
> +
> +static bool hv_sev_es_hcall_finish(struct ghcb *ghcb, struct pt_regs *regs)
> +{
> + /* No checking of the return state needed */
> + return true;
> +}
> +
> const __initconst struct hypervisor_x86 x86_hyper_ms_hyperv = {
> .name = "Microsoft Hyper-V",
> .detect = ms_hyperv_platform,
> @@ -584,4 +599,6 @@ const __initconst struct hypervisor_x86 x86_hyper_ms_hyperv
> = {
> .init.x2apic_available = ms_hyperv_x2apic_available,
> .init.msi_ext_dest_id = ms_hyperv_msi_ext_dest_id,
> .init.init_platform = ms_hyperv_init_platform,
> + .runtime.sev_es_hcall_prepare = hv_sev_es_hcall_prepare,
> + .runtime.sev_es_hcall_finish = hv_sev_es_hcall_finish,
> };
> --
> 2.25.1
Reviewed-by: Michael Kelley <mikelley@xxxxxxxxxxxxx>
