Commit 07ae5389 authored by Alexander Graf's avatar Alexander Graf Committed by Paul Mackerras
Browse files

KVM: PPC: Book3S PR: Fix svcpu copying with preemption enabled 



When copying between the vcpu and svcpu, we may get scheduled away onto
a different host CPU which in turn means our svcpu pointer may change.

That means we need to atomically copy to and from the svcpu with preemption
disabled, so that all code around it always sees a coherent state.

Reported-by: default avatarSimon Guo <wei.guo.simon@gmail.com>
Fixes: 3d3319b4 ("KVM: PPC: Book3S: PR: Enable interrupts earlier")
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
parent 36ee41d1

arch/powerpc/include/asm/kvm_book3s.h

+2 −4
Original line number Diff line number Diff line
@@ -249,10 +249,8 @@ extern int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd); 
extern void kvmppc_pr_init_default_hcalls(struct kvm *kvm);

extern int kvmppc_hcall_impl_pr(unsigned long cmd);

extern int kvmppc_hcall_impl_hv_realmode(unsigned long cmd);

extern void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu,

				 struct kvm_vcpu *vcpu);

extern void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu,

				   struct kvmppc_book3s_shadow_vcpu *svcpu);

extern void kvmppc_copy_to_svcpu(struct kvm_vcpu *vcpu);

extern void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu);

extern int kvm_irq_bypass;



static inline struct kvmppc_vcpu_book3s *to_book3s(struct kvm_vcpu *vcpu)

arch/powerpc/kvm/book3s_interrupts.S

+1 −3
Original line number Diff line number Diff line
@@ -96,7 +96,7 @@ kvm_start_entry: 


kvm_start_lightweight:

	/* Copy registers into shadow vcpu so we can access them in real mode */

	GET_SHADOW_VCPU(r3)

	mr	r3, r4

	bl	FUNC(kvmppc_copy_to_svcpu)

	nop

	REST_GPR(4, r1)
@@ -165,9 +165,7 @@ after_sprg3_load: 
	stw	r12, VCPU_TRAP(r3)



	/* Transfer reg values from shadow vcpu back to vcpu struct */

	/* On 64-bit, interrupts are still off at this point */



	GET_SHADOW_VCPU(r4)

	bl	FUNC(kvmppc_copy_from_svcpu)

	nop

arch/powerpc/kvm/book3s_pr.c

+9 −11
Original line number Diff line number Diff line
@@ -120,7 +120,7 @@ static void kvmppc_core_vcpu_put_pr(struct kvm_vcpu *vcpu) 
#ifdef CONFIG_PPC_BOOK3S_64

	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);

	if (svcpu->in_use) {

		kvmppc_copy_from_svcpu(vcpu, svcpu);

		kvmppc_copy_from_svcpu(vcpu);

	}

	memcpy(to_book3s(vcpu)->slb_shadow, svcpu->slb, sizeof(svcpu->slb));

	to_book3s(vcpu)->slb_shadow_max = svcpu->slb_max;
@@ -142,9 +142,10 @@ static void kvmppc_core_vcpu_put_pr(struct kvm_vcpu *vcpu) 
}



/* Copy data needed by real-mode code from vcpu to shadow vcpu */

void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu,

			  struct kvm_vcpu *vcpu)

void kvmppc_copy_to_svcpu(struct kvm_vcpu *vcpu)

{

	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);



	svcpu->gpr[0] = vcpu->arch.gpr[0];

	svcpu->gpr[1] = vcpu->arch.gpr[1];

	svcpu->gpr[2] = vcpu->arch.gpr[2];
@@ -176,17 +177,14 @@ void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu, 
	if (cpu_has_feature(CPU_FTR_ARCH_207S))

		vcpu->arch.entry_ic = mfspr(SPRN_IC);

	svcpu->in_use = true;



	svcpu_put(svcpu);

}



/* Copy data touched by real-mode code from shadow vcpu back to vcpu */

void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu,

			    struct kvmppc_book3s_shadow_vcpu *svcpu)

void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu)

{

	/*

	 * vcpu_put would just call us again because in_use hasn't

	 * been updated yet.

	 */

	preempt_disable();

	struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);



	/*

	 * Maybe we were already preempted and synced the svcpu from
@@ -232,7 +230,7 @@ void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu, 
	svcpu->in_use = false;



out:

	preempt_enable();

	svcpu_put(svcpu);

}



static int kvmppc_core_check_requests_pr(struct kvm_vcpu *vcpu)

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