linux-kernel - Re: [PATCH v2 07/13] KVM: add vcpu-specific functions to read/write/translate GFNs

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Date:	Fri, 05 Jun 2015 17:27:31 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>
CC:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	guangrong.xiao@...ux.intel.com, bdas@...hat.com
Subject: Re: [PATCH v2 07/13] KVM: add vcpu-specific functions to read/write/translate
 GFNs



On 05/06/2015 17:13, Radim Krčmář wrote:
> 2015-06-05 14:46+0200, Paolo Bonzini:
>> On 05/06/2015 14:10, Radim Krčmář wrote:
>>> +		ret = __kvm_write_guest_page(__gfn_to_memslot(slots, gfn), gfn,
>>> +				data, offset, seg);
>>
>> Even better, let's pass memslots to all the __ functions.
> 
> Yeah, while scoping it, I noticed a bug in the series ...
> makes me wish that C had a useful type system.
> 
> A quick fix would be to replace gpa with gfn in calls to
> __kvm_read_guest_atomic().  I presume you'd prefer a new patch to
> rebasing, so it's below.

Since it was pushed only for 15 minutes or so, and the fix is two lines:

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 30425ce6a4a4..848af90b8091 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1669,7 +1669,7 @@ int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
 	struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
 	int offset = offset_in_page(gpa);
 
-	return __kvm_read_guest_atomic(slot, gpa, data, offset, len);
+	return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
 }
 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
 
@@ -1680,7 +1680,7 @@ int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
 	struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
 	int offset = offset_in_page(gpa);
 
-	return __kvm_read_guest_atomic(slot, gpa, data, offset, len);
+	return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
 }
 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);

I just force-pushed kvm/next.

The patch is good, but I prefer to do minimal changes before fleeing
on holiday.

Paolo
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