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[Xen-devel] [GIT PULL] Xen time-setting

To: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] [GIT PULL] Xen time-setting
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 25 Oct 2011 12:16:50 -0700
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Delivery-date: Tue, 25 Oct 2011 12:17:37 -0700
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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).

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+@nr_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..@cpumap_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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