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Date: Fri, 7 Apr 2023 21:28:02 -0700
From: Saurabh Singh Sengar <ssengar@...ux.microsoft.com>
To: Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>
Cc: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
decui@...rosoft.com, arnd@...db.de, tiala@...rosoft.com,
mikelley@...rosoft.com, linux-kernel@...r.kernel.org,
linux-hyperv@...r.kernel.org, linux-arch@...r.kernel.org,
jgross@...e.com, mat.jonczyk@...pl
Subject: Re: [PATCH v4 2/5] x86/hyperv: Add VTL specific structs and
hypercalls
On Thu, Apr 06, 2023 at 06:51:13AM -0700, Stanislav Kinsburskii wrote:
> On Tue, Apr 04, 2023 at 02:01:01AM -0700, Saurabh Sengar wrote:
> > Add structs and hypercalls required to enable VTL support on x86.
> >
> > Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
> > Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
> > ---
> > arch/x86/include/asm/hyperv-tlfs.h | 75 ++++++++++++++++++++++++++++++
> > include/asm-generic/hyperv-tlfs.h | 4 ++
> > 2 files changed, 79 insertions(+)
> >
> > diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
> > index 0b73a809e9e1..0b0b4e9a4318 100644
> > --- a/arch/x86/include/asm/hyperv-tlfs.h
> > +++ b/arch/x86/include/asm/hyperv-tlfs.h
> > @@ -713,6 +713,81 @@ union hv_msi_entry {
> > } __packed;
> > };
> >
> > +struct hv_x64_segment_register {
> > + __u64 base;
>
> Ideally they arch-size types naming should be consistent: either with underscores or
> without.
> The majority of cases in this file are without underscores.
Although I am fine either way, I think in a non-uapi file "without underscore" is prefered.
I can change this in next version.
Regards,
Saurabh
>
> Reviewed-by: Stanislav Kinsburskii <stanislav.kinsburskii@...il.com>
>
> > + __u32 limit;
> > + __u16 selector;
> > + union {
> > + struct {
> > + __u16 segment_type : 4;
> > + __u16 non_system_segment : 1;
> > + __u16 descriptor_privilege_level : 2;
> > + __u16 present : 1;
> > + __u16 reserved : 4;
> > + __u16 available : 1;
> > + __u16 _long : 1;
> > + __u16 _default : 1;
> > + __u16 granularity : 1;
> > + } __packed;
> > + __u16 attributes;
> > + };
> > +} __packed;
> > +
> > +struct hv_x64_table_register {
> > + __u16 pad[3];
> > + __u16 limit;
> > + __u64 base;
> > +} __packed;
> > +
> > +struct hv_init_vp_context {
> > + u64 rip;
> > + u64 rsp;
> > + u64 rflags;
> > +
> > + struct hv_x64_segment_register cs;
> > + struct hv_x64_segment_register ds;
> > + struct hv_x64_segment_register es;
> > + struct hv_x64_segment_register fs;
> > + struct hv_x64_segment_register gs;
> > + struct hv_x64_segment_register ss;
> > + struct hv_x64_segment_register tr;
> > + struct hv_x64_segment_register ldtr;
> > +
> > + struct hv_x64_table_register idtr;
> > + struct hv_x64_table_register gdtr;
> > +
> > + u64 efer;
> > + u64 cr0;
> > + u64 cr3;
> > + u64 cr4;
> > + u64 msr_cr_pat;
> > +} __packed;
> > +
> > +union hv_input_vtl {
> > + u8 as_uint8;
> > + struct {
> > + u8 target_vtl: 4;
> > + u8 use_target_vtl: 1;
> > + u8 reserved_z: 3;
> > + };
> > +} __packed;
> > +
> > +struct hv_enable_vp_vtl {
> > + u64 partition_id;
> > + u32 vp_index;
> > + union hv_input_vtl target_vtl;
> > + u8 mbz0;
> > + u16 mbz1;
> > + struct hv_init_vp_context vp_context;
> > +} __packed;
> > +
> > +struct hv_get_vp_from_apic_id_in {
> > + u64 partition_id;
> > + union hv_input_vtl target_vtl;
> > + u8 res[7];
> > + u32 apic_ids[];
> > +} __packed;
> > +
> > #include <asm-generic/hyperv-tlfs.h>
> >
> > #endif
> > diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
> > index b870983596b9..87258341fd7c 100644
> > --- a/include/asm-generic/hyperv-tlfs.h
> > +++ b/include/asm-generic/hyperv-tlfs.h
> > @@ -146,6 +146,7 @@ union hv_reference_tsc_msr {
> > /* Declare the various hypercall operations. */
> > #define HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE 0x0002
> > #define HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST 0x0003
> > +#define HVCALL_ENABLE_VP_VTL 0x000f
> > #define HVCALL_NOTIFY_LONG_SPIN_WAIT 0x0008
> > #define HVCALL_SEND_IPI 0x000b
> > #define HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX 0x0013
> > @@ -165,6 +166,8 @@ union hv_reference_tsc_msr {
> > #define HVCALL_MAP_DEVICE_INTERRUPT 0x007c
> > #define HVCALL_UNMAP_DEVICE_INTERRUPT 0x007d
> > #define HVCALL_RETARGET_INTERRUPT 0x007e
> > +#define HVCALL_START_VP 0x0099
> > +#define HVCALL_GET_VP_ID_FROM_APIC_ID 0x009a
> > #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE 0x00af
> > #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST 0x00b0
> > #define HVCALL_MODIFY_SPARSE_GPA_PAGE_HOST_VISIBILITY 0x00db
> > @@ -218,6 +221,7 @@ enum HV_GENERIC_SET_FORMAT {
> > #define HV_STATUS_INVALID_PORT_ID 17
> > #define HV_STATUS_INVALID_CONNECTION_ID 18
> > #define HV_STATUS_INSUFFICIENT_BUFFERS 19
> > +#define HV_STATUS_VTL_ALREADY_ENABLED 134
> >
> > /*
> > * The Hyper-V TimeRefCount register and the TSC
> > --
> > 2.34.1
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