[PATCH 03/05] KVM: IA64: Add handler for crashed vmm.
"Zhang, Xiantao" <[email protected]>
| Newsgroups | org.kernel.vger.kvm-ia64,org.kernel.vger.kvm |
|---|---|
| Message-ID | <706158FABBBA044BAD4FE898A02E4BC219B293A7@pdsmsx503.ccr.corp.intel.com> |
From 2d01c04c416fb28670052c60b8bde787fa71788f Mon Sep 17 00:00:00 2001 From: Xiantao Zhang <[email protected]> Date: Fri, 21 Nov 2008 17:16:07 +0800 Subject: [PATCH] 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: Xiantao Zhang <[email protected]> --- arch/ia64/kvm/process.c | 20 ++++++++++++++++++++ arch/ia64/kvm/vcpu.h | 3 +++ arch/ia64/kvm/vmm.c | 2 ++ arch/ia64/kvm/vmm_ivt.S | 31 +++++++++++++++++++------------ 4 files changed, 44 insertions(+), 12 deletions(-) diff --git a/arch/ia64/kvm/process.c b/arch/ia64/kvm/process.c index cefc349..552d077 100644 --- a/arch/ia64/kvm/process.c +++ b/arch/ia64/kvm/process.c @@ -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]); +} diff --git a/arch/ia64/kvm/vcpu.h b/arch/ia64/kvm/vcpu.h index 0dad842..b2f12a5 100644 --- a/arch/ia64/kvm/vcpu.h +++ b/arch/ia64/kvm/vcpu.h @@ -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__ */ diff --git a/arch/ia64/kvm/vmm.c b/arch/ia64/kvm/vmm.c index d3dc0b0..9eee5c0 100644 --- a/arch/ia64/kvm/vmm.c +++ b/arch/ia64/kvm/vmm.c @@ -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, diff --git a/arch/ia64/kvm/vmm_ivt.S b/arch/ia64/kvm/vmm_ivt.S index c1d7251..50b4646 100644 --- a/arch/ia64/kvm/vmm_ivt.S +++ b/arch/ia64/kvm/vmm_ivt.S @@ -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" -- 1.6.0
0003-KVM-IA64-Add-handler-for-crashed-vmm.patch
(application/octet-stream, 3.8 KB)
From 2d01c04c416fb28670052c60b8bde787fa71788f Mon Sep 17 00:00:00 2001 From: Xiantao Zhang <[email protected]> Date: Fri, 21 Nov 2008 17:16:07 +0800 Subject: [PATCH] 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: Xiantao Zhang <[email protected]> --- arch/ia64/kvm/process.c | 20 ++++++++++++++++++++ arch/ia64/kvm/vcpu.h | 3 +++ arch/ia64/kvm/vmm.c | 2 ++ arch/ia64/kvm/vmm_ivt.S | 31 +++++++++++++++++++------------ 4 files changed, 44 insertions(+), 12 deletions(-) diff --git a/arch/ia64/kvm/process.c b/arch/ia64/kvm/process.c index cefc349..552d077 100644 --- a/arch/ia64/kvm/process.c +++ b/arch/ia64/kvm/process.c @@ -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]); +} diff --git a/arch/ia64/kvm/vcpu.h b/arch/ia64/kvm/vcpu.h index 0dad842..b2f12a5 100644 --- a/arch/ia64/kvm/vcpu.h +++ b/arch/ia64/kvm/vcpu.h @@ -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__ */ diff --git a/arch/ia64/kvm/vmm.c b/arch/ia64/kvm/vmm.c index d3dc0b0..9eee5c0 100644 --- a/arch/ia64/kvm/vmm.c +++ b/arch/ia64/kvm/vmm.c @@ -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, diff --git a/arch/ia64/kvm/vmm_ivt.S b/arch/ia64/kvm/vmm_ivt.S index c1d7251..50b4646 100644 --- a/arch/ia64/kvm/vmm_ivt.S +++ b/arch/ia64/kvm/vmm_ivt.S @@ -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" -- 1.6.0