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From: Greg KH <greg@kroah.com>
To: Babu Moger <babu.moger@amd.com>
Cc: corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com,
	bp@alien8.de, hpa@zytor.com, pbonzini@redhat.com,
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	kvm@vger.kernel.org
Subject: Re: [PATCH 5.4] KVM: x86: Fix pkru save/restore when guest CR4.PKE=0, move it to x86.c
Date: Sat, 23 May 2020 09:49:08 +0200
Message-ID: <20200523074908.GA3285051@kroah.com> (raw)
In-Reply-To: <159016509437.3131.17229420966309596602.stgit@naples-babu.amd.com>

On Fri, May 22, 2020 at 11:32:49AM -0500, Babu Moger wrote:
> [Backported upstream commit 37486135d3a7b03acc7755b63627a130437f066a]
> 
> Though rdpkru and wrpkru are contingent upon CR4.PKE, the PKRU
> resource isn't. It can be read with XSAVE and written with XRSTOR.
> So, if we don't set the guest PKRU value here(kvm_load_guest_xsave_state),
> the guest can read the host value.
> 
> In case of kvm_load_host_xsave_state, guest with CR4.PKE clear could
> potentially use XRSTOR to change the host PKRU value.
> 
> While at it, move pkru state save/restore to common code and the
> host_pkru field to kvm_vcpu_arch.  This will let SVM support protection keys.
> 
> Cc: stable@vger.kernel.org
> Reported-by: Jim Mattson <jmattson@google.com>
> Signed-off-by: Babu Moger <babu.moger@amd.com>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Now applied, thanks.

greg k-h

      parent reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-22 16:32 Babu Moger
2020-05-22 18:33 ` Paolo Bonzini
2020-05-23  7:49 ` Greg KH [this message]

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