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Date: Tue, 01 Nov 2011 14:02:58 -0700
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
CC: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] Xen time-setting
On 10/25/2011 12:16 PM, Jeremy Fitzhardinge wrote:
> Hi Linus,
>
> This just wires up "set system time" through to Xen so it can set the
> actual RTC hardware. The bulk of the patch is a new header to define
> the Xen platform interface ABI, which will also get used by other
> patches in this merge window (I hope).
Ping?
>
> Thanks,
> J
>
> The following changes since commit 02f8c6aee8df3cdc935e9bdd4f2d020306035dbe:
>
> Linux 3.0 (2011-07-21 19:17:23 -0700)
>
> are available in the git repository at:
> git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git upstream/xen-settime
>
> Jeremy Fitzhardinge (2):
> xen: add dom0_op hypercall
> xen/dom0: set wallclock time in Xen
>
> Yu Ke (1):
> xen/acpi: Domain0 acpi parser related platform hypercall
>
> arch/ia64/include/asm/xen/interface.h | 1 +
> arch/x86/include/asm/xen/hypercall.h | 8 +
> arch/x86/include/asm/xen/interface.h | 1 +
> arch/x86/xen/time.c | 16 ++-
> include/xen/interface/platform.h | 320 +++++++++++++++++++++++++++++++++
> include/xen/interface/xen.h | 1 +
> 6 files changed, 346 insertions(+), 1 deletions(-)
> create mode 100644 include/xen/interface/platform.h
>
> diff --git a/arch/ia64/include/asm/xen/interface.h b/arch/ia64/include/asm/xen/interface.h
> index e951e74..1d2427d 100644
> --- a/arch/ia64/include/asm/xen/interface.h
> +++ b/arch/ia64/include/asm/xen/interface.h
> @@ -76,6 +76,7 @@ DEFINE_GUEST_HANDLE(char);
> DEFINE_GUEST_HANDLE(int);
> DEFINE_GUEST_HANDLE(long);
> DEFINE_GUEST_HANDLE(void);
> +DEFINE_GUEST_HANDLE(uint64_t);
>
> typedef unsigned long xen_pfn_t;
> DEFINE_GUEST_HANDLE(xen_pfn_t);
> diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h
> index d240ea9..0c9894e 100644
> --- a/arch/x86/include/asm/xen/hypercall.h
> +++ b/arch/x86/include/asm/xen/hypercall.h
> @@ -45,6 +45,7 @@
> #include <xen/interface/xen.h>
> #include <xen/interface/sched.h>
> #include <xen/interface/physdev.h>
> +#include <xen/interface/platform.h>
>
> /*
> * The hypercall asms have to meet several constraints:
> @@ -299,6 +300,13 @@ HYPERVISOR_set_timer_op(u64 timeout)
> }
>
> static inline int
> +HYPERVISOR_dom0_op(struct xen_platform_op *platform_op)
> +{
> + platform_op->interface_version = XENPF_INTERFACE_VERSION;
> + return _hypercall1(int, dom0_op, platform_op);
> +}
> +
> +static inline int
> HYPERVISOR_set_debugreg(int reg, unsigned long value)
> {
> return _hypercall2(int, set_debugreg, reg, value);
> diff --git a/arch/x86/include/asm/xen/interface.h b/arch/x86/include/asm/xen/interface.h
> index 5d4922a..a1f2db5 100644
> --- a/arch/x86/include/asm/xen/interface.h
> +++ b/arch/x86/include/asm/xen/interface.h
> @@ -55,6 +55,7 @@ DEFINE_GUEST_HANDLE(char);
> DEFINE_GUEST_HANDLE(int);
> DEFINE_GUEST_HANDLE(long);
> DEFINE_GUEST_HANDLE(void);
> +DEFINE_GUEST_HANDLE(uint64_t);
> #endif
>
> #ifndef HYPERVISOR_VIRT_START
> diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
> index 5158c50..8c9cdfa 100644
> --- a/arch/x86/xen/time.c
> +++ b/arch/x86/xen/time.c
> @@ -200,8 +200,22 @@ static unsigned long xen_get_wallclock(void)
>
> static int xen_set_wallclock(unsigned long now)
> {
> + struct xen_platform_op op;
> + int rc;
> +
> /* do nothing for domU */
> - return -1;
> + if (!xen_initial_domain())
> + return -1;
> +
> + op.cmd = XENPF_settime;
> + op.u.settime.secs = now;
> + op.u.settime.nsecs = 0;
> + op.u.settime.system_time = xen_clocksource_read();
> +
> + rc = HYPERVISOR_dom0_op(&op);
> + WARN(rc != 0, "XENPF_settime failed: now=%ld\n", now);
> +
> + return rc;
> }
>
> static struct clocksource xen_clocksource __read_mostly = {
> diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h
> new file mode 100644
> index 0000000..c168468
> --- /dev/null
> +++ b/include/xen/interface/platform.h
> @@ -0,0 +1,320 @@
> +/******************************************************************************
> + * platform.h
> + *
> + * Hardware platform operations. Intended for use by domain-0 kernel.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Copyright (c) 2002-2006, K Fraser
> + */
> +
> +#ifndef __XEN_PUBLIC_PLATFORM_H__
> +#define __XEN_PUBLIC_PLATFORM_H__
> +
> +#include "xen.h"
> +
> +#define XENPF_INTERFACE_VERSION 0x03000001
> +
> +/*
> + * Set clock such that it would read <secs,nsecs> after 00:00:00 UTC,
> + * 1 January, 1970 if the current system time was <system_time>.
> + */
> +#define XENPF_settime 17
> +struct xenpf_settime {
> + /* IN variables. */
> + uint32_t secs;
> + uint32_t nsecs;
> + uint64_t system_time;
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xenpf_settime_t);
> +
> +/*
> + * Request memory range (@mfn, @mfn+@...mfns-1) to have type @type.
> + * On x86, @type is an architecture-defined MTRR memory type.
> + * On success, returns the MTRR that was used (@reg) and a handle that can
> + * be passed to XENPF_DEL_MEMTYPE to accurately tear down the new setting.
> + * (x86-specific).
> + */
> +#define XENPF_add_memtype 31
> +struct xenpf_add_memtype {
> + /* IN variables. */
> + unsigned long mfn;
> + uint64_t nr_mfns;
> + uint32_t type;
> + /* OUT variables. */
> + uint32_t handle;
> + uint32_t reg;
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xenpf_add_memtype_t);
> +
> +/*
> + * Tear down an existing memory-range type. If @handle is remembered then it
> + * should be passed in to accurately tear down the correct setting (in case
> + * of overlapping memory regions with differing types). If it is not known
> + * then @handle should be set to zero. In all cases @reg must be set.
> + * (x86-specific).
> + */
> +#define XENPF_del_memtype 32
> +struct xenpf_del_memtype {
> + /* IN variables. */
> + uint32_t handle;
> + uint32_t reg;
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xenpf_del_memtype_t);
> +
> +/* Read current type of an MTRR (x86-specific). */
> +#define XENPF_read_memtype 33
> +struct xenpf_read_memtype {
> + /* IN variables. */
> + uint32_t reg;
> + /* OUT variables. */
> + unsigned long mfn;
> + uint64_t nr_mfns;
> + uint32_t type;
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xenpf_read_memtype_t);
> +
> +#define XENPF_microcode_update 35
> +struct xenpf_microcode_update {
> + /* IN variables. */
> + GUEST_HANDLE(void) data; /* Pointer to microcode data */
> + uint32_t length; /* Length of microcode data. */
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xenpf_microcode_update_t);
> +
> +#define XENPF_platform_quirk 39
> +#define QUIRK_NOIRQBALANCING 1 /* Do not restrict IO-APIC RTE targets */
> +#define QUIRK_IOAPIC_BAD_REGSEL 2 /* IO-APIC REGSEL forgets its value */
> +#define QUIRK_IOAPIC_GOOD_REGSEL 3 /* IO-APIC REGSEL behaves properly */
> +struct xenpf_platform_quirk {
> + /* IN variables. */
> + uint32_t quirk_id;
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xenpf_platform_quirk_t);
> +
> +#define XENPF_firmware_info 50
> +#define XEN_FW_DISK_INFO 1 /* from int 13 AH=08/41/48 */
> +#define XEN_FW_DISK_MBR_SIGNATURE 2 /* from MBR offset 0x1b8 */
> +#define XEN_FW_VBEDDC_INFO 3 /* from int 10 AX=4f15 */
> +struct xenpf_firmware_info {
> + /* IN variables. */
> + uint32_t type;
> + uint32_t index;
> + /* OUT variables. */
> + union {
> + struct {
> + /* Int13, Fn48: Check Extensions Present. */
> + uint8_t device; /* %dl: bios device number */
> + uint8_t version; /* %ah: major version */
> + uint16_t interface_support; /* %cx: support bitmap */
> + /* Int13, Fn08: Legacy Get Device Parameters. */
> + uint16_t legacy_max_cylinder; /* %cl[7:6]:%ch: max cyl # */
> + uint8_t legacy_max_head; /* %dh: max head # */
> + uint8_t legacy_sectors_per_track; /* %cl[5:0]: max sector # */
> + /* Int13, Fn41: Get Device Parameters (as filled into %ds:%esi). */
> + /* NB. First uint16_t of buffer must be set to buffer size. */
> + GUEST_HANDLE(void) edd_params;
> + } disk_info; /* XEN_FW_DISK_INFO */
> + struct {
> + uint8_t device; /* bios device number */
> + uint32_t mbr_signature; /* offset 0x1b8 in mbr */
> + } disk_mbr_signature; /* XEN_FW_DISK_MBR_SIGNATURE */
> + struct {
> + /* Int10, AX=4F15: Get EDID info. */
> + uint8_t capabilities;
> + uint8_t edid_transfer_time;
> + /* must refer to 128-byte buffer */
> + GUEST_HANDLE(uchar) edid;
> + } vbeddc_info; /* XEN_FW_VBEDDC_INFO */
> + } u;
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xenpf_firmware_info_t);
> +
> +#define XENPF_enter_acpi_sleep 51
> +struct xenpf_enter_acpi_sleep {
> + /* IN variables */
> + uint16_t pm1a_cnt_val; /* PM1a control value. */
> + uint16_t pm1b_cnt_val; /* PM1b control value. */
> + uint32_t sleep_state; /* Which state to enter (Sn). */
> + uint32_t flags; /* Must be zero. */
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xenpf_enter_acpi_sleep_t);
> +
> +#define XENPF_change_freq 52
> +struct xenpf_change_freq {
> + /* IN variables */
> + uint32_t flags; /* Must be zero. */
> + uint32_t cpu; /* Physical cpu. */
> + uint64_t freq; /* New frequency (Hz). */
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xenpf_change_freq_t);
> +
> +/*
> + * Get idle times (nanoseconds since boot) for physical CPUs specified in the
> + * @cpumap_bitmap with range [0..@...map_nr_cpus-1]. The @idletime array is
> + * indexed by CPU number; only entries with the corresponding @cpumap_bitmap
> + * bit set are written to. On return, @cpumap_bitmap is modified so that any
> + * non-existent CPUs are cleared. Such CPUs have their @idletime array entry
> + * cleared.
> + */
> +#define XENPF_getidletime 53
> +struct xenpf_getidletime {
> + /* IN/OUT variables */
> + /* IN: CPUs to interrogate; OUT: subset of IN which are present */
> + GUEST_HANDLE(uchar) cpumap_bitmap;
> + /* IN variables */
> + /* Size of cpumap bitmap. */
> + uint32_t cpumap_nr_cpus;
> + /* Must be indexable for every cpu in cpumap_bitmap. */
> + GUEST_HANDLE(uint64_t) idletime;
> + /* OUT variables */
> + /* System time when the idletime snapshots were taken. */
> + uint64_t now;
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xenpf_getidletime_t);
> +
> +#define XENPF_set_processor_pminfo 54
> +
> +/* ability bits */
> +#define XEN_PROCESSOR_PM_CX 1
> +#define XEN_PROCESSOR_PM_PX 2
> +#define XEN_PROCESSOR_PM_TX 4
> +
> +/* cmd type */
> +#define XEN_PM_CX 0
> +#define XEN_PM_PX 1
> +#define XEN_PM_TX 2
> +
> +/* Px sub info type */
> +#define XEN_PX_PCT 1
> +#define XEN_PX_PSS 2
> +#define XEN_PX_PPC 4
> +#define XEN_PX_PSD 8
> +
> +struct xen_power_register {
> + uint32_t space_id;
> + uint32_t bit_width;
> + uint32_t bit_offset;
> + uint32_t access_size;
> + uint64_t address;
> +};
> +
> +struct xen_processor_csd {
> + uint32_t domain; /* domain number of one dependent group */
> + uint32_t coord_type; /* coordination type */
> + uint32_t num; /* number of processors in same domain */
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xen_processor_csd);
> +
> +struct xen_processor_cx {
> + struct xen_power_register reg; /* GAS for Cx trigger register */
> + uint8_t type; /* cstate value, c0: 0, c1: 1, ... */
> + uint32_t latency; /* worst latency (ms) to enter/exit this cstate */
> + uint32_t power; /* average power consumption(mW) */
> + uint32_t dpcnt; /* number of dependency entries */
> + GUEST_HANDLE(xen_processor_csd) dp; /* NULL if no dependency */
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xen_processor_cx);
> +
> +struct xen_processor_flags {
> + uint32_t bm_control:1;
> + uint32_t bm_check:1;
> + uint32_t has_cst:1;
> + uint32_t power_setup_done:1;
> + uint32_t bm_rld_set:1;
> +};
> +
> +struct xen_processor_power {
> + uint32_t count; /* number of C state entries in array below */
> + struct xen_processor_flags flags; /* global flags of this processor */
> + GUEST_HANDLE(xen_processor_cx) states; /* supported c states */
> +};
> +
> +struct xen_pct_register {
> + uint8_t descriptor;
> + uint16_t length;
> + uint8_t space_id;
> + uint8_t bit_width;
> + uint8_t bit_offset;
> + uint8_t reserved;
> + uint64_t address;
> +};
> +
> +struct xen_processor_px {
> + uint64_t core_frequency; /* megahertz */
> + uint64_t power; /* milliWatts */
> + uint64_t transition_latency; /* microseconds */
> + uint64_t bus_master_latency; /* microseconds */
> + uint64_t control; /* control value */
> + uint64_t status; /* success indicator */
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xen_processor_px);
> +
> +struct xen_psd_package {
> + uint64_t num_entries;
> + uint64_t revision;
> + uint64_t domain;
> + uint64_t coord_type;
> + uint64_t num_processors;
> +};
> +
> +struct xen_processor_performance {
> + uint32_t flags; /* flag for Px sub info type */
> + uint32_t platform_limit; /* Platform limitation on freq usage */
> + struct xen_pct_register control_register;
> + struct xen_pct_register status_register;
> + uint32_t state_count; /* total available performance states */
> + GUEST_HANDLE(xen_processor_px) states;
> + struct xen_psd_package domain_info;
> + uint32_t shared_type; /* coordination type of this processor */
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xen_processor_performance);
> +
> +struct xenpf_set_processor_pminfo {
> + /* IN variables */
> + uint32_t id; /* ACPI CPU ID */
> + uint32_t type; /* {XEN_PM_CX, XEN_PM_PX} */
> + union {
> + struct xen_processor_power power;/* Cx: _CST/_CSD */
> + struct xen_processor_performance perf; /* Px: _PPC/_PCT/_PSS/_PSD */
> + };
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xenpf_set_processor_pminfo);
> +
> +struct xen_platform_op {
> + uint32_t cmd;
> + uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
> + union {
> + struct xenpf_settime settime;
> + struct xenpf_add_memtype add_memtype;
> + struct xenpf_del_memtype del_memtype;
> + struct xenpf_read_memtype read_memtype;
> + struct xenpf_microcode_update microcode;
> + struct xenpf_platform_quirk platform_quirk;
> + struct xenpf_firmware_info firmware_info;
> + struct xenpf_enter_acpi_sleep enter_acpi_sleep;
> + struct xenpf_change_freq change_freq;
> + struct xenpf_getidletime getidletime;
> + struct xenpf_set_processor_pminfo set_pminfo;
> + uint8_t pad[128];
> + } u;
> +};
> +DEFINE_GUEST_HANDLE_STRUCT(xen_platform_op_t);
> +
> +#endif /* __XEN_PUBLIC_PLATFORM_H__ */
> diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
> index 70213b4..d83cc08 100644
> --- a/include/xen/interface/xen.h
> +++ b/include/xen/interface/xen.h
> @@ -453,6 +453,7 @@ struct start_info {
> /* These flags are passed in the 'flags' field of start_info_t. */
> #define SIF_PRIVILEGED (1<<0) /* Is the domain privileged? */
> #define SIF_INITDOMAIN (1<<1) /* Is this the initial control domain? */
> +#define SIF_PM_MASK (0xFF<<8) /* reserve 1 byte for xen-pm options */
>
> typedef uint64_t cpumap_t;
>
>
>
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