Avi Kivity wrote:
> Harvey Harrison wrote:
>> arch/x86/kvm/x86.c:3484:25: warning: cast truncates bits from constant
>> value (100 becomes 0)
>> arch/x86/kvm/x86.c:3510:24: warning: cast truncates bits from constant
>> value (100 becomes 0)
>>
>> The problem:
>> cseg_desc.type &= ~(1 << 8); //clear the B flag
>> nseg_desc.type |= (1 << 8);
>>
>> type is a 4-bit bitfield on x86....please look into this.
>>
>>
>
> I think it ought to be (1 << 1), not (1 << 8), as it refers to the
> "busy" bit of the task type. Izik?
>
>
>From cf6e76c69a38a983df0c84a3dcc2336042eb3436 Mon Sep 17 00:00:00 2001
From: Izik Eidus <[EMAIL PROTECTED]>
Date: Mon, 28 Apr 2008 18:16:08 +0300
Subject: [PATCH] KVM: x86: task switch: fix wrong bit setting for the busy flag.
the busy bit is in offset of 1 inside type and not in 8.
Signed-off-by: Izik Eidus <[EMAIL PROTECTED]>
---
arch/x86/kvm/x86.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0ce5563..5c360bb 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3481,7 +3481,7 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16
tss_selector, int reason)
}
if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
- cseg_desc.type &= ~(1 << 8); //clear the B flag
+ cseg_desc.type &= ~(1 << 1); //clear the B flag
save_guest_segment_descriptor(vcpu, tr_seg.selector,
&cseg_desc);
}
@@ -3507,7 +3507,7 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16
tss_selector, int reason)
}
if (reason != TASK_SWITCH_IRET) {
- nseg_desc.type |= (1 << 8);
+ nseg_desc.type |= (1 << 1);
save_guest_segment_descriptor(vcpu, tss_selector,
&nseg_desc);
}
--
1.5.3.6
--
woof.
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