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| Current File : //sys/xen/interface/arch-x86/xen-mca.h |
/******************************************************************************
* arch-x86/mca.h
*
* Contributed by Advanced Micro Devices, Inc.
* Author: Christoph Egger <Christoph.Egger@amd.com>
*
* Guest OS machine check interface to x86 Xen.
*
* 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.
*/
/* Full MCA functionality has the following Usecases from the guest side:
*
* Must have's:
* 1. Dom0 and DomU register machine check trap callback handlers
* (already done via "set_trap_table" hypercall)
* 2. Dom0 registers machine check event callback handler
* (doable via EVTCHNOP_bind_virq)
* 3. Dom0 and DomU fetches machine check data
* 4. Dom0 wants Xen to notify a DomU
* 5. Dom0 gets DomU ID from physical address
* 6. Dom0 wants Xen to kill DomU (already done for "xm destroy")
*
* Nice to have's:
* 7. Dom0 wants Xen to deactivate a physical CPU
* This is better done as separate task, physical CPU hotplugging,
* and hypercall(s) should be sysctl's
* 8. Page migration proposed from Xen NUMA work, where Dom0 can tell Xen to
* move a DomU (or Dom0 itself) away from a malicious page
* producing correctable errors.
* 9. offlining physical page:
* Xen free's and never re-uses a certain physical page.
* 10. Testfacility: Allow Dom0 to write values into machine check MSR's
* and tell Xen to trigger a machine check
*/
#ifndef __XEN_PUBLIC_ARCH_X86_MCA_H__
#define __XEN_PUBLIC_ARCH_X86_MCA_H__
/* Hypercall */
#define __HYPERVISOR_mca __HYPERVISOR_arch_0
#define XEN_MCA_INTERFACE_VERSION 0x03000001
/* IN: Dom0 calls hypercall from MC event handler. */
#define XEN_MC_CORRECTABLE 0x0
/* IN: Dom0/DomU calls hypercall from MC trap handler. */
#define XEN_MC_TRAP 0x1
/* XEN_MC_CORRECTABLE and XEN_MC_TRAP are mutually exclusive. */
/* OUT: All is ok */
#define XEN_MC_OK 0x0
/* OUT: Domain could not fetch data. */
#define XEN_MC_FETCHFAILED 0x1
/* OUT: There was no machine check data to fetch. */
#define XEN_MC_NODATA 0x2
/* OUT: Between notification time and this hypercall an other
* (most likely) correctable error happened. The fetched data,
* does not match the original machine check data. */
#define XEN_MC_NOMATCH 0x4
/* OUT: DomU did not register MC NMI handler. Try something else. */
#define XEN_MC_CANNOTHANDLE 0x8
/* OUT: Notifying DomU failed. Retry later or try something else. */
#define XEN_MC_NOTDELIVERED 0x10
/* Note, XEN_MC_CANNOTHANDLE and XEN_MC_NOTDELIVERED are mutually exclusive. */
#ifndef __ASSEMBLY__
#define VIRQ_MCA VIRQ_ARCH_0 /* G. (DOM0) Machine Check Architecture */
/*
* Machine Check Architecure:
* structs are read-only and used to report all kinds of
* correctable and uncorrectable errors detected by the HW.
* Dom0 and DomU: register a handler to get notified.
* Dom0 only: Correctable errors are reported via VIRQ_MCA
* Dom0 and DomU: Uncorrectable errors are reported via nmi handlers
*/
#define MC_TYPE_GLOBAL 0
#define MC_TYPE_BANK 1
#define MC_TYPE_EXTENDED 2
struct mcinfo_common {
uint16_t type; /* structure type */
uint16_t size; /* size of this struct in bytes */
};
#define MC_FLAG_CORRECTABLE (1 << 0)
#define MC_FLAG_UNCORRECTABLE (1 << 1)
/* contains global x86 mc information */
struct mcinfo_global {
struct mcinfo_common common;
/* running domain at the time in error (most likely the impacted one) */
uint16_t mc_domid;
uint32_t mc_socketid; /* physical socket of the physical core */
uint16_t mc_coreid; /* physical impacted core */
uint16_t mc_core_threadid; /* core thread of physical core */
uint16_t mc_vcpuid; /* virtual cpu scheduled for mc_domid */
uint64_t mc_gstatus; /* global status */
uint32_t mc_flags;
};
/* contains bank local x86 mc information */
struct mcinfo_bank {
struct mcinfo_common common;
uint16_t mc_bank; /* bank nr */
uint16_t mc_domid; /* Usecase 5: domain referenced by mc_addr on dom0
* and if mc_addr is valid. Never valid on DomU. */
uint64_t mc_status; /* bank status */
uint64_t mc_addr; /* bank address, only valid
* if addr bit is set in mc_status */
uint64_t mc_misc;
};
struct mcinfo_msr {
uint64_t reg; /* MSR */
uint64_t value; /* MSR value */
};
/* contains mc information from other
* or additional mc MSRs */
struct mcinfo_extended {
struct mcinfo_common common;
/* You can fill up to five registers.
* If you need more, then use this structure
* multiple times. */
uint32_t mc_msrs; /* Number of msr with valid values. */
struct mcinfo_msr mc_msr[5];
};
#define MCINFO_HYPERCALLSIZE 1024
#define MCINFO_MAXSIZE 768
struct mc_info {
/* Number of mcinfo_* entries in mi_data */
uint32_t mi_nentries;
uint8_t mi_data[MCINFO_MAXSIZE - sizeof(uint32_t)];
};
typedef struct mc_info mc_info_t;
/*
* OS's should use these instead of writing their own lookup function
* each with its own bugs and drawbacks.
* We use macros instead of static inline functions to allow guests
* to include this header in assembly files (*.S).
*/
/* Prototype:
* uint32_t x86_mcinfo_nentries(struct mc_info *mi);
*/
#define x86_mcinfo_nentries(_mi) \
(_mi)->mi_nentries
/* Prototype:
* struct mcinfo_common *x86_mcinfo_first(struct mc_info *mi);
*/
#define x86_mcinfo_first(_mi) \
(struct mcinfo_common *)((_mi)->mi_data)
/* Prototype:
* struct mcinfo_common *x86_mcinfo_next(struct mcinfo_common *mic);
*/
#define x86_mcinfo_next(_mic) \
(struct mcinfo_common *)((uint8_t *)(_mic) + (_mic)->size)
/* Prototype:
* void x86_mcinfo_lookup(void *ret, struct mc_info *mi, uint16_t type);
*/
#define x86_mcinfo_lookup(_ret, _mi, _type) \
do { \
uint32_t found, i; \
struct mcinfo_common *_mic; \
\
found = 0; \
(_ret) = NULL; \
if (_mi == NULL) break; \
_mic = x86_mcinfo_first(_mi); \
for (i = 0; i < x86_mcinfo_nentries(_mi); i++) { \
if (_mic->type == (_type)) { \
found = 1; \
break; \
} \
_mic = x86_mcinfo_next(_mic); \
} \
(_ret) = found ? _mic : NULL; \
} while (0)
/* Usecase 1
* Register machine check trap callback handler
* (already done via "set_trap_table" hypercall)
*/
/* Usecase 2
* Dom0 registers machine check event callback handler
* done by EVTCHNOP_bind_virq
*/
/* Usecase 3
* Fetch machine check data from hypervisor.
* Note, this hypercall is special, because both Dom0 and DomU must use this.
*/
#define XEN_MC_fetch 1
struct xen_mc_fetch {
/* IN/OUT variables. */
uint32_t flags;
/* IN: XEN_MC_CORRECTABLE, XEN_MC_TRAP */
/* OUT: XEN_MC_OK, XEN_MC_FETCHFAILED, XEN_MC_NODATA, XEN_MC_NOMATCH */
/* OUT variables. */
uint32_t fetch_idx; /* only useful for Dom0 for the notify hypercall */
struct mc_info mc_info;
};
typedef struct xen_mc_fetch xen_mc_fetch_t;
DEFINE_XEN_GUEST_HANDLE(xen_mc_fetch_t);
/* Usecase 4
* This tells the hypervisor to notify a DomU about the machine check error
*/
#define XEN_MC_notifydomain 2
struct xen_mc_notifydomain {
/* IN variables. */
uint16_t mc_domid; /* The unprivileged domain to notify. */
uint16_t mc_vcpuid; /* The vcpu in mc_domid to notify.
* Usually echo'd value from the fetch hypercall. */
uint32_t fetch_idx; /* echo'd value from the fetch hypercall. */
/* IN/OUT variables. */
uint32_t flags;
/* IN: XEN_MC_CORRECTABLE, XEN_MC_TRAP */
/* OUT: XEN_MC_OK, XEN_MC_CANNOTHANDLE, XEN_MC_NOTDELIVERED, XEN_MC_NOMATCH */
};
typedef struct xen_mc_notifydomain xen_mc_notifydomain_t;
DEFINE_XEN_GUEST_HANDLE(xen_mc_notifydomain_t);
struct xen_mc {
uint32_t cmd;
uint32_t interface_version; /* XEN_MCA_INTERFACE_VERSION */
union {
struct xen_mc_fetch mc_fetch;
struct xen_mc_notifydomain mc_notifydomain;
uint8_t pad[MCINFO_HYPERCALLSIZE];
} u;
};
typedef struct xen_mc xen_mc_t;
DEFINE_XEN_GUEST_HANDLE(xen_mc_t);
#endif /* __ASSEMBLY__ */
#endif /* __XEN_PUBLIC_ARCH_X86_MCA_H__ */