Commit 9f7d5bb5 authored by Xiantao Zhang's avatar Xiantao Zhang Committed by Avi Kivity
Browse files

KVM: ia64: Add handler for crashed vmm 



Since vmm runs in an isolated address space and it is just a copy
of host's kvm-intel module, so once vmm crashes, we just crash all guests
running on it instead of crashing whole kernel.

Signed-off-by: default avatarXiantao Zhang <xiantao.zhang@intel.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 5e2be198

arch/ia64/kvm/process.c

+20 −0
Original line number Diff line number Diff line
@@ -942,8 +942,20 @@ static void vcpu_do_resume(struct kvm_vcpu *vcpu) 
	ia64_set_pta(vcpu->arch.vhpt.pta.val);

}



static void vmm_sanity_check(struct kvm_vcpu *vcpu)

{

	struct exit_ctl_data *p = &vcpu->arch.exit_data;



	if (!vmm_sanity && p->exit_reason != EXIT_REASON_DEBUG) {

		panic_vm(vcpu, "Failed to do vmm sanity check,"

			"it maybe caused by crashed vmm!!\n\n");

	}

}



static void kvm_do_resume_op(struct kvm_vcpu *vcpu)

{

	vmm_sanity_check(vcpu); /*Guarantee vcpu runing on healthy vmm!*/



	if (test_and_clear_bit(KVM_REQ_RESUME, &vcpu->requests)) {

		vcpu_do_resume(vcpu);

		return;
@@ -969,3 +981,11 @@ void vmm_transition(struct kvm_vcpu *vcpu) 
						1, 0, 0, 0, 0, 0);

	kvm_do_resume_op(vcpu);

}



void vmm_panic_handler(u64 vec)

{

	struct kvm_vcpu *vcpu = current_vcpu;

	vmm_sanity = 0;

	panic_vm(vcpu, "Unexpected interruption occurs in VMM, vector:0x%lx\n",

			vec2off[vec]);

}

arch/ia64/kvm/vcpu.h

+3 −0
Original line number Diff line number Diff line
@@ -741,5 +741,8 @@ void panic_vm(struct kvm_vcpu *v, const char *fmt, ...); 


extern u64 ia64_call_vsa(u64 proc, u64 arg1, u64 arg2, u64 arg3,

		u64 arg4, u64 arg5, u64 arg6, u64 arg7);



extern long vmm_sanity;



#endif

#endif	/* __VCPU_H__ */

arch/ia64/kvm/vmm.c

+2 −0
Original line number Diff line number Diff line
@@ -32,6 +32,8 @@ MODULE_LICENSE("GPL"); 
extern char kvm_ia64_ivt;

extern fpswa_interface_t *vmm_fpswa_interface;



long vmm_sanity = 1;



struct kvm_vmm_info vmm_info = {

	.module	     = THIS_MODULE,

	.vmm_entry   = vmm_entry,

arch/ia64/kvm/vmm_ivt.S

+19 −12
Original line number Diff line number Diff line
@@ -70,14 +70,12 @@ 
# define PSR_DEFAULT_BITS   0

#endif





#define KVM_FAULT(n)    \

    kvm_fault_##n:;          \

    mov r19=n;;          \

    br.sptk.many kvm_fault_##n;         \

    br.sptk.many kvm_vmm_panic;         \

    ;;                  \





#define KVM_REFLECT(n)    \

    mov r31=pr;           \

    mov r19=n;       /* prepare to save predicates */ \
@@ -85,17 +83,26 @@ 
    ;;      \

    tbit.z p6,p7=r29,IA64_PSR_VM_BIT;       \

(p7)br.sptk.many kvm_dispatch_reflection;        \

    br.sptk.many kvm_panic;      \



    br.sptk.many kvm_vmm_panic;      \



GLOBAL_ENTRY(kvm_panic)

    br.sptk.many kvm_panic

GLOBAL_ENTRY(kvm_vmm_panic)

    KVM_SAVE_MIN_WITH_COVER_R19

    alloc r14=ar.pfs,0,0,1,0

    mov out0=r15

    adds r3=8,r2                // set up second base pointer

    ;;

END(kvm_panic)









    ssm psr.ic

    ;;

    srlz.i                  // guarantee that interruption collection is on

    ;;

    //(p15) ssm psr.i               // restore psr.i

    addl r14=@gprel(ia64_leave_hypervisor),gp

    ;;

    KVM_SAVE_REST

    mov rp=r14

    ;;

    br.call.sptk.many b6=vmm_panic_handler;

END(kvm_vmm_panic)



    .section .text.ivt,"ax"

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