e0b7ec058c
On a threaded processor such as POWER7, we group VCPUs into virtual cores and arrange that the VCPUs in a virtual core run on the same physical core. Currently we don't enforce any correspondence between virtual thread numbers within a virtual core and physical thread numbers. Physical threads are allocated starting at 0 on a first-come first-served basis to runnable virtual threads (VCPUs). POWER8 implements a new "msgsndp" instruction which guest kernels can use to interrupt other threads in the same core or sub-core. Since the instruction takes the destination physical thread ID as a parameter, it becomes necessary to align the physical thread IDs with the virtual thread IDs, that is, to make sure virtual thread N within a virtual core always runs on physical thread N. This means that it's possible that thread 0, which is where we call __kvmppc_vcore_entry, may end up running some other vcpu than the one whose task called kvmppc_run_core(), or it may end up running no vcpu at all, if for example thread 0 of the virtual core is currently executing in userspace. However, we do need thread 0 to be responsible for switching the MMU -- a previous version of this patch that had other threads switching the MMU was found to be responsible for occasional memory corruption and machine check interrupts in the guest on POWER7 machines. To accommodate this, we no longer pass the vcpu pointer to __kvmppc_vcore_entry, but instead let the assembly code load it from the PACA. Since the assembly code will need to know the kvm pointer and the thread ID for threads which don't have a vcpu, we move the thread ID into the PACA and we add a kvm pointer to the virtual core structure. In the case where thread 0 has no vcpu to run, it still calls into kvmppc_hv_entry in order to do the MMU switch, and then naps until either its vcpu is ready to run in the guest, or some other thread needs to exit the guest. In the latter case, thread 0 jumps to the code that switches the MMU back to the host. This control flow means that now we switch the MMU before loading any guest vcpu state. Similarly, on guest exit we now save all the guest vcpu state before switching the MMU back to the host. This has required substantial code movement, making the diff rather large. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
/*
|
|
* 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 SUSE Linux Products GmbH 2009
|
|
*
|
|
* Authors: Alexander Graf <agraf@suse.de>
|
|
*/
|
|
|
|
#ifndef __ASM_KVM_BOOK3S_ASM_H__
|
|
#define __ASM_KVM_BOOK3S_ASM_H__
|
|
|
|
/* XICS ICP register offsets */
|
|
#define XICS_XIRR 4
|
|
#define XICS_MFRR 0xc
|
|
#define XICS_IPI 2 /* interrupt source # for IPIs */
|
|
|
|
#ifdef __ASSEMBLY__
|
|
|
|
#ifdef CONFIG_KVM_BOOK3S_HANDLER
|
|
|
|
#include <asm/kvm_asm.h>
|
|
|
|
.macro DO_KVM intno
|
|
.if (\intno == BOOK3S_INTERRUPT_SYSTEM_RESET) || \
|
|
(\intno == BOOK3S_INTERRUPT_MACHINE_CHECK) || \
|
|
(\intno == BOOK3S_INTERRUPT_DATA_STORAGE) || \
|
|
(\intno == BOOK3S_INTERRUPT_INST_STORAGE) || \
|
|
(\intno == BOOK3S_INTERRUPT_DATA_SEGMENT) || \
|
|
(\intno == BOOK3S_INTERRUPT_INST_SEGMENT) || \
|
|
(\intno == BOOK3S_INTERRUPT_EXTERNAL) || \
|
|
(\intno == BOOK3S_INTERRUPT_EXTERNAL_HV) || \
|
|
(\intno == BOOK3S_INTERRUPT_ALIGNMENT) || \
|
|
(\intno == BOOK3S_INTERRUPT_PROGRAM) || \
|
|
(\intno == BOOK3S_INTERRUPT_FP_UNAVAIL) || \
|
|
(\intno == BOOK3S_INTERRUPT_DECREMENTER) || \
|
|
(\intno == BOOK3S_INTERRUPT_SYSCALL) || \
|
|
(\intno == BOOK3S_INTERRUPT_TRACE) || \
|
|
(\intno == BOOK3S_INTERRUPT_PERFMON) || \
|
|
(\intno == BOOK3S_INTERRUPT_ALTIVEC) || \
|
|
(\intno == BOOK3S_INTERRUPT_VSX)
|
|
|
|
b kvmppc_trampoline_\intno
|
|
kvmppc_resume_\intno:
|
|
|
|
.endif
|
|
.endm
|
|
|
|
#else
|
|
|
|
.macro DO_KVM intno
|
|
.endm
|
|
|
|
#endif /* CONFIG_KVM_BOOK3S_HANDLER */
|
|
|
|
#else /*__ASSEMBLY__ */
|
|
|
|
/*
|
|
* This struct goes in the PACA on 64-bit processors. It is used
|
|
* to store host state that needs to be saved when we enter a guest
|
|
* and restored when we exit, but isn't specific to any particular
|
|
* guest or vcpu. It also has some scratch fields used by the guest
|
|
* exit code.
|
|
*/
|
|
struct kvmppc_host_state {
|
|
ulong host_r1;
|
|
ulong host_r2;
|
|
ulong host_msr;
|
|
ulong vmhandler;
|
|
ulong scratch0;
|
|
ulong scratch1;
|
|
u8 in_guest;
|
|
u8 restore_hid5;
|
|
u8 napping;
|
|
|
|
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
|
|
u8 hwthread_req;
|
|
u8 hwthread_state;
|
|
u8 host_ipi;
|
|
u8 ptid;
|
|
struct kvm_vcpu *kvm_vcpu;
|
|
struct kvmppc_vcore *kvm_vcore;
|
|
unsigned long xics_phys;
|
|
u32 saved_xirr;
|
|
u64 dabr;
|
|
u64 host_mmcr[3];
|
|
u32 host_pmc[8];
|
|
u64 host_purr;
|
|
u64 host_spurr;
|
|
u64 host_dscr;
|
|
u64 dec_expires;
|
|
#endif
|
|
#ifdef CONFIG_PPC_BOOK3S_64
|
|
u64 cfar;
|
|
u64 ppr;
|
|
#endif
|
|
};
|
|
|
|
struct kvmppc_book3s_shadow_vcpu {
|
|
ulong gpr[14];
|
|
u32 cr;
|
|
u32 xer;
|
|
ulong ctr;
|
|
ulong lr;
|
|
ulong pc;
|
|
|
|
ulong shadow_srr1;
|
|
ulong fault_dar;
|
|
u32 fault_dsisr;
|
|
u32 last_inst;
|
|
|
|
#ifdef CONFIG_PPC_BOOK3S_32
|
|
u32 sr[16]; /* Guest SRs */
|
|
|
|
struct kvmppc_host_state hstate;
|
|
#endif
|
|
|
|
#ifdef CONFIG_PPC_BOOK3S_64
|
|
u8 slb_max; /* highest used guest slb entry */
|
|
struct {
|
|
u64 esid;
|
|
u64 vsid;
|
|
} slb[64]; /* guest SLB */
|
|
#endif
|
|
};
|
|
|
|
#endif /*__ASSEMBLY__ */
|
|
|
|
/* Values for kvm_state */
|
|
#define KVM_HWTHREAD_IN_KERNEL 0
|
|
#define KVM_HWTHREAD_IN_NAP 1
|
|
#define KVM_HWTHREAD_IN_KVM 2
|
|
|
|
#endif /* __ASM_KVM_BOOK3S_ASM_H__ */
|