Re: [PATCH] KVM: vmx: DR7 masking on task switch emulation is wrong
From: Paolo Bonzini
Date: Mon May 19 2014 - 07:51:25 EST
Il 19/05/2014 08:50, Nadav Amit ha scritto:
The DR7 masking which is done on task switch emulation should be in hex format
(clearing the local breakpoints enable bits 0,2,4 and 6).
Signed-off-by: Nadav Amit <namit@xxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 138ceff..286d510 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -5439,7 +5439,7 @@ static int handle_task_switch(struct kvm_vcpu *vcpu)
}
/* clear all local breakpoint enable flags */
- vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55);
+ vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~0x55);
/*
* TODO: What about debug traps on tss switch?
Thanks, applying to kvm/queue.
Paolo
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