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linux-hardened/arch/powerpc/include/asm/kvm_host.h
Paul Mackerras 371fefd6f2 KVM: PPC: Allow book3s_hv guests to use SMT processor modes 
This lifts the restriction that book3s_hv guests can only run one
hardware thread per core, and allows them to use up to 4 threads
per core on POWER7.  The host still has to run single-threaded.

This capability is advertised to qemu through a new KVM_CAP_PPC_SMT
capability.  The return value of the ioctl querying this capability
is the number of vcpus per virtual CPU core (vcore), currently 4.

To use this, the host kernel should be booted with all threads
active, and then all the secondary threads should be offlined.
This will put the secondary threads into nap mode.  KVM will then
wake them from nap mode and use them for running guest code (while
they are still offline).  To wake the secondary threads, we send
them an IPI using a new xics_wake_cpu() function, implemented in
arch/powerpc/sysdev/xics/icp-native.c.  In other words, at this stage
we assume that the platform has a XICS interrupt controller and
we are using icp-native.c to drive it.  Since the woken thread will
need to acknowledge and clear the IPI, we also export the base
physical address of the XICS registers using kvmppc_set_xics_phys()
for use in the low-level KVM book3s code.

When a vcpu is created, it is assigned to a virtual CPU core.
The vcore number is obtained by dividing the vcpu number by the
number of threads per core in the host.  This number is exported
to userspace via the KVM_CAP_PPC_SMT capability.  If qemu wishes
to run the guest in single-threaded mode, it should make all vcpu
numbers be multiples of the number of threads per core.

We distinguish three states of a vcpu: runnable (i.e., ready to execute
the guest), blocked (that is, idle), and busy in host.  We currently
implement a policy that the vcore can run only when all its threads
are runnable or blocked.  This way, if a vcpu needs to execute elsewhere
in the kernel or in qemu, it can do so without being starved of CPU
by the other vcpus.

When a vcore starts to run, it executes in the context of one of the
vcpu threads.  The other vcpu threads all go to sleep and stay asleep
until something happens requiring the vcpu thread to return to qemu,
or to wake up to run the vcore (this can happen when another vcpu
thread goes from busy in host state to blocked).

It can happen that a vcpu goes from blocked to runnable state (e.g.
because of an interrupt), and the vcore it belongs to is already
running.  In that case it can start to run immediately as long as
the none of the vcpus in the vcore have started to exit the guest.
We send the next free thread in the vcore an IPI to get it to start
to execute the guest.  It synchronizes with the other threads via
the vcore->entry_exit_count field to make sure that it doesn't go
into the guest if the other vcpus are exiting by the time that it
is ready to actually enter the guest.

Note that there is no fixed relationship between the hardware thread
number and the vcpu number.  Hardware threads are assigned to vcpus
as they become runnable, so we will always use the lower-numbered
hardware threads in preference to higher-numbered threads if not all
the vcpus in the vcore are runnable, regardless of which vcpus are
runnable.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
2011-07-12 13:16:57 +03:00

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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2007
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#ifndef __POWERPC_KVM_HOST_H__
#define __POWERPC_KVM_HOST_H__
#include <linux/mutex.h>
#include <linux/hrtimer.h>
#include <linux/interrupt.h>
#include <linux/types.h>
#include <linux/kvm_types.h>
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/kvm_para.h>
#include <asm/kvm_asm.h>
#include <asm/processor.h>
#define KVM_MAX_VCPUS NR_CPUS
#define KVM_MAX_VCORES NR_CPUS
#define KVM_MEMORY_SLOTS 32
/* memory slots that does not exposed to userspace */
#define KVM_PRIVATE_MEM_SLOTS 4
#ifdef CONFIG_KVM_MMIO
#define KVM_COALESCED_MMIO_PAGE_OFFSET 1
#endif
/* We don't currently support large pages. */
#define KVM_HPAGE_GFN_SHIFT(x) 0
#define KVM_NR_PAGE_SIZES 1
#define KVM_PAGES_PER_HPAGE(x) (1UL<<31)
#define HPTEG_CACHE_NUM (1 << 15)
#define HPTEG_HASH_BITS_PTE 13
#define HPTEG_HASH_BITS_PTE_LONG 12
#define HPTEG_HASH_BITS_VPTE 13
#define HPTEG_HASH_BITS_VPTE_LONG 5
#define HPTEG_HASH_NUM_PTE (1 << HPTEG_HASH_BITS_PTE)
#define HPTEG_HASH_NUM_PTE_LONG (1 << HPTEG_HASH_BITS_PTE_LONG)
#define HPTEG_HASH_NUM_VPTE (1 << HPTEG_HASH_BITS_VPTE)
#define HPTEG_HASH_NUM_VPTE_LONG (1 << HPTEG_HASH_BITS_VPTE_LONG)
/* Physical Address Mask - allowed range of real mode RAM access */
#define KVM_PAM 0x0fffffffffffffffULL
struct kvm;
struct kvm_run;
struct kvm_vcpu;
struct lppaca;
struct slb_shadow;
struct dtl;
struct kvm_vm_stat {
u32 remote_tlb_flush;
};
struct kvm_vcpu_stat {
u32 sum_exits;
u32 mmio_exits;
u32 dcr_exits;
u32 signal_exits;
u32 light_exits;
/* Account for special types of light exits: */
u32 itlb_real_miss_exits;
u32 itlb_virt_miss_exits;
u32 dtlb_real_miss_exits;
u32 dtlb_virt_miss_exits;
u32 syscall_exits;
u32 isi_exits;
u32 dsi_exits;
u32 emulated_inst_exits;
u32 dec_exits;
u32 ext_intr_exits;
u32 halt_wakeup;
#ifdef CONFIG_PPC_BOOK3S
u32 pf_storage;
u32 pf_instruc;
u32 sp_storage;
u32 sp_instruc;
u32 queue_intr;
u32 ld;
u32 ld_slow;
u32 st;
u32 st_slow;
#endif
};
enum kvm_exit_types {
MMIO_EXITS,
DCR_EXITS,
SIGNAL_EXITS,
ITLB_REAL_MISS_EXITS,
ITLB_VIRT_MISS_EXITS,
DTLB_REAL_MISS_EXITS,
DTLB_VIRT_MISS_EXITS,
SYSCALL_EXITS,
ISI_EXITS,
DSI_EXITS,
EMULATED_INST_EXITS,
EMULATED_MTMSRWE_EXITS,
EMULATED_WRTEE_EXITS,
EMULATED_MTSPR_EXITS,
EMULATED_MFSPR_EXITS,
EMULATED_MTMSR_EXITS,
EMULATED_MFMSR_EXITS,
EMULATED_TLBSX_EXITS,
EMULATED_TLBWE_EXITS,
EMULATED_RFI_EXITS,
DEC_EXITS,
EXT_INTR_EXITS,
HALT_WAKEUP,
USR_PR_INST,
FP_UNAVAIL,
DEBUG_EXITS,
TIMEINGUEST,
__NUMBER_OF_KVM_EXIT_TYPES
};
/* allow access to big endian 32bit upper/lower parts and 64bit var */
struct kvmppc_exit_timing {
union {
u64 tv64;
struct {
u32 tbu, tbl;
} tv32;
};
};
struct kvmppc_pginfo {
unsigned long pfn;
atomic_t refcnt;
};
struct kvmppc_spapr_tce_table {
struct list_head list;
struct kvm *kvm;
u64 liobn;
u32 window_size;
struct page *pages[0];
};
struct kvm_arch {
#ifdef CONFIG_KVM_BOOK3S_64_HV
unsigned long hpt_virt;
unsigned long ram_npages;
unsigned long ram_psize;
unsigned long ram_porder;
struct kvmppc_pginfo *ram_pginfo;
unsigned int lpid;
unsigned int host_lpid;
unsigned long host_lpcr;
unsigned long sdr1;
unsigned long host_sdr1;
int tlbie_lock;
struct list_head spapr_tce_tables;
unsigned short last_vcpu[NR_CPUS];
struct kvmppc_vcore *vcores[KVM_MAX_VCORES];
#endif /* CONFIG_KVM_BOOK3S_64_HV */
};
/*
* Struct for a virtual core.
* Note: entry_exit_count combines an entry count in the bottom 8 bits
* and an exit count in the next 8 bits. This is so that we can
* atomically increment the entry count iff the exit count is 0
* without taking the lock.
*/
struct kvmppc_vcore {
int n_runnable;
int n_blocked;
int num_threads;
int entry_exit_count;
int n_woken;
int nap_count;
u16 pcpu;
u8 vcore_running;
u8 in_guest;
struct list_head runnable_threads;
spinlock_t lock;
};
#define VCORE_ENTRY_COUNT(vc) ((vc)->entry_exit_count & 0xff)
#define VCORE_EXIT_COUNT(vc) ((vc)->entry_exit_count >> 8)
struct kvmppc_pte {
ulong eaddr;
u64 vpage;
ulong raddr;
bool may_read : 1;
bool may_write : 1;
bool may_execute : 1;
};
struct kvmppc_mmu {
/* book3s_64 only */
void (*slbmte)(struct kvm_vcpu *vcpu, u64 rb, u64 rs);
u64 (*slbmfee)(struct kvm_vcpu *vcpu, u64 slb_nr);
u64 (*slbmfev)(struct kvm_vcpu *vcpu, u64 slb_nr);
void (*slbie)(struct kvm_vcpu *vcpu, u64 slb_nr);
void (*slbia)(struct kvm_vcpu *vcpu);
/* book3s */
void (*mtsrin)(struct kvm_vcpu *vcpu, u32 srnum, ulong value);
u32 (*mfsrin)(struct kvm_vcpu *vcpu, u32 srnum);
int (*xlate)(struct kvm_vcpu *vcpu, gva_t eaddr, struct kvmppc_pte *pte, bool data);
void (*reset_msr)(struct kvm_vcpu *vcpu);
void (*tlbie)(struct kvm_vcpu *vcpu, ulong addr, bool large);
int (*esid_to_vsid)(struct kvm_vcpu *vcpu, ulong esid, u64 *vsid);
u64 (*ea_to_vp)(struct kvm_vcpu *vcpu, gva_t eaddr, bool data);
bool (*is_dcbz32)(struct kvm_vcpu *vcpu);
};
struct kvmppc_slb {
u64 esid;
u64 vsid;
u64 orige;
u64 origv;
bool valid : 1;
bool Ks : 1;
bool Kp : 1;
bool nx : 1;
bool large : 1; /* PTEs are 16MB */
bool tb : 1; /* 1TB segment */
bool class : 1;
};
struct kvm_vcpu_arch {
ulong host_stack;
u32 host_pid;
#ifdef CONFIG_PPC_BOOK3S
ulong host_msr;
ulong host_r2;
void *host_retip;
ulong trampoline_lowmem;
ulong trampoline_enter;
ulong highmem_handler;
ulong rmcall;
ulong host_paca_phys;
struct kvmppc_slb slb[64];
int slb_max; /* 1 + index of last valid entry in slb[] */
int slb_nr; /* total number of entries in SLB */
struct kvmppc_mmu mmu;
#endif
ulong gpr[32];
u64 fpr[32];
u64 fpscr;
#ifdef CONFIG_SPE
ulong evr[32];
ulong spefscr;
ulong host_spefscr;
u64 acc;
#endif
#ifdef CONFIG_ALTIVEC
vector128 vr[32];
vector128 vscr;
#endif
#ifdef CONFIG_VSX
u64 vsr[64];
#endif
#ifdef CONFIG_PPC_BOOK3S
/* For Gekko paired singles */
u32 qpr[32];
#endif
ulong pc;
ulong ctr;
ulong lr;
ulong xer;
u32 cr;
#ifdef CONFIG_PPC_BOOK3S
ulong hflags;
ulong guest_owned_ext;
ulong purr;
ulong spurr;
ulong lpcr;
ulong dscr;
ulong amr;
ulong uamor;
u32 ctrl;
ulong dabr;
#endif
u32 vrsave; /* also USPRG0 */
u32 mmucr;
ulong shadow_msr;
ulong sprg4;
ulong sprg5;
ulong sprg6;
ulong sprg7;
ulong csrr0;
ulong csrr1;
ulong dsrr0;
ulong dsrr1;
ulong mcsrr0;
ulong mcsrr1;
ulong mcsr;
ulong esr;
u32 dec;
u32 decar;
u32 tbl;
u32 tbu;
u32 tcr;
u32 tsr;
u32 ivor[64];
ulong ivpr;
u32 pir;
u32 pvr;
u32 shadow_pid;
u32 shadow_pid1;
u32 pid;
u32 swap_pid;
u32 ccr0;
u32 ccr1;
u32 dbcr0;
u32 dbcr1;
u32 dbsr;
u64 mmcr[3];
u32 pmc[6];
#ifdef CONFIG_KVM_EXIT_TIMING
struct mutex exit_timing_lock;
struct kvmppc_exit_timing timing_exit;
struct kvmppc_exit_timing timing_last_enter;
u32 last_exit_type;
u32 timing_count_type[__NUMBER_OF_KVM_EXIT_TYPES];
u64 timing_sum_duration[__NUMBER_OF_KVM_EXIT_TYPES];
u64 timing_sum_quad_duration[__NUMBER_OF_KVM_EXIT_TYPES];
u64 timing_min_duration[__NUMBER_OF_KVM_EXIT_TYPES];
u64 timing_max_duration[__NUMBER_OF_KVM_EXIT_TYPES];
u64 timing_last_exit;
struct dentry *debugfs_exit_timing;
#endif
#ifdef CONFIG_PPC_BOOK3S
ulong fault_dar;
u32 fault_dsisr;
#endif
#ifdef CONFIG_BOOKE
ulong fault_dear;
ulong fault_esr;
ulong queued_dear;
ulong queued_esr;
#endif
gpa_t paddr_accessed;
u8 io_gpr; /* GPR used as IO source/target */
u8 mmio_is_bigendian;
u8 mmio_sign_extend;
u8 dcr_needed;
u8 dcr_is_write;
u8 osi_needed;
u8 osi_enabled;
u8 hcall_needed;
u32 cpr0_cfgaddr; /* holds the last set cpr0_cfgaddr */
struct hrtimer dec_timer;
struct tasklet_struct tasklet;
u64 dec_jiffies;
u64 dec_expires;
unsigned long pending_exceptions;
u16 last_cpu;
u8 ceded;
u8 prodded;
u32 last_inst;
struct lppaca *vpa;
struct slb_shadow *slb_shadow;
struct dtl *dtl;
struct dtl *dtl_end;
struct kvmppc_vcore *vcore;
int ret;
int trap;
int state;
int ptid;
wait_queue_head_t cpu_run;
struct kvm_vcpu_arch_shared *shared;
unsigned long magic_page_pa; /* phys addr to map the magic page to */
unsigned long magic_page_ea; /* effect. addr to map the magic page to */
#ifdef CONFIG_KVM_BOOK3S_64_HV
struct kvm_vcpu_arch_shared shregs;
struct list_head run_list;
struct task_struct *run_task;
struct kvm_run *kvm_run;
#endif
};
#define KVMPPC_VCPU_BUSY_IN_HOST 0
#define KVMPPC_VCPU_BLOCKED 1
#define KVMPPC_VCPU_RUNNABLE 2
#endif /* __POWERPC_KVM_HOST_H__ */
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