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Message-ID: <20100317224002.GA5156@Localhorst.asterix.local> Date: Wed, 17 Mar 2010 23:40:03 +0100 From: Dieter Ries <mail@...terries.net> To: Alexander Graf <agraf@...e.de> Cc: Avi Kivity <avi@...hat.com>, linux-kernel@...r.kernel.org, kvm@...r.kernel.org Subject: Re: [PATCH 23/42] KVM: Activate Virtualization On Demand On Wed, Mar 17, 2010 at 11:02:40PM +0100, Alexander Graf wrote: > On 17.03.2010, at 22:57, Dieter Ries wrote: > > Hi, > > > > This is breaking KVM on my Phenom II X4 955. > > > > When I start kvm I get this on the terminal: > > > > kvm_create_vm: Device or resource busy > > Could not initialize KVM, will disable KVM support > > > > And in dmesg: > > [ 67.980732] kvm: enabling virtualization on CPU0 failed > > > > > > I commented out the if() and return, and I added 2 printk's there for > > debugging, and now that's what I see in dmesg when I start kvm: > > > > [ 3341.740112] efer is 3329 > > [ 3341.740113] efer is 3329 > > [ 3341.740117] efer is 3329 > > [ 3341.740119] EFER_SVME is 4096 > > [ 3341.740121] EFER_SVME is 4096 > > [ 3341.740124] EFER_SVME is 4096 > > [ 3341.740130] efer is 3329 > > [ 3341.740132] EFER_SVME is 4096 > > > > In hex the values are 0x1000 and 0x0d01 > > > > KVM has been working well on this machine before, and it still works > > well after commenting that part out. > > > > I am not sure what the value of this register is supposed to be, but are > > you sure > > > > if (efer & EFER_SVME) > > > > is the right condition? > > According to the printks you show above the & condition should never apply. > > Are you 100% sure you don't have vmware, virtualbox, parallels, whatever running in parallel on that machine? Definitely. I have virtualbox installed, but haven't used it in months. The others I don't use at all, so they are not installed either. There is nothing running which could cause that. Behaviour is the same when I don't log into KDE but just try this without X, where nearly nothing is started. I noted something more now: When I comment it out once, and start kvm like that, and then remove the comments again, then it works. So I guess the dmesg parts I wrote were not perfect. It's more like: I: After reboot, with debugging printk and if condition: [ 42.089423] efer is d01 [ 42.089425] efer is d01 [ 42.089428] efer is d01 [ 42.089430] EFER_SVME is 1000 [ 42.089431] EFER_SVME is 1000 [ 42.089433] EFER_SVME is 1000 [ 42.089436] efer is 1d01 [ 42.089438] EFER_SVME is 1000 [ 42.089440] kvm: enabling virtualization on CPU0 failed II: debugging printk, no if condition: [ 317.355519] efer is d01 [ 317.355522] efer is d01 [ 317.355524] efer is d01 [ 317.355527] EFER_SVME is 1000 [ 317.355528] EFER_SVME is 1000 [ 317.355531] EFER_SVME is 1000 [ 317.355534] efer is 1d01 [ 317.355536] EFER_SVME is 1000 III: debugging printk and if condition: [ 421.955433] efer is d01 [ 421.955437] efer is d01 [ 421.955440] efer is d01 [ 421.955442] EFER_SVME is 1000 [ 421.955443] EFER_SVME is 1000 [ 421.955445] EFER_SVME is 1000 [ 421.955449] efer is d01 [ 421.955451] EFER_SVME is 1000 This is without reboots in between. So now before I use the commented out version for the first time, it doesnt work, the 2nd time it works. Maybe some initialization problem... > Alex cu Dieter -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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