linux-kernel - Re: [PATCH v2] x86: svm: use kvm_register

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150220232116.GN19378@pd.tnic>
Date:	Sat, 21 Feb 2015 00:21:16 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Joel Schopp <joel.schopp@....com>
Cc:	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
	Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
	David Kaplan <david.kaplan@....com>
Subject: Re: [PATCH v2] x86: svm: use kvm_register_write()/read()

On Fri, Feb 20, 2015 at 04:02:10PM -0600, Joel Schopp wrote:
> From: David Kaplan <david.kaplan@....com>
> 
> KVM has nice wrappers to access the register values, clean up a few places
> that should use them but currently do not.
> 
> Signed-off-by: David Kaplan <david.kaplan@....com>
> [forward port and testing]
> Signed-off-by: Joel Schopp <joel.schopp@....com>

Looks good.

Acked-by: Borislav Petkov <bp@...e.de>

> ---
>  arch/x86/kvm/svm.c |   19 +++++++++----------
>  1 file changed, 9 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index d319e0c..a7d88e4 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c

...

> @@ -3142,8 +3142,8 @@ static int rdmsr_interception(struct vcpu_svm *svm)
>  	} else {
>  		trace_kvm_msr_read(ecx, data);
>  
> -		svm->vcpu.arch.regs[VCPU_REGS_RAX] = data & 0xffffffff;
> -		svm->vcpu.arch.regs[VCPU_REGS_RDX] = data >> 32;
> +		kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, data & 0xffffffff);
> +		kvm_register_write(&svm->vcpu, VCPU_REGS_RDX, data >> 32);

Right, kvm is missing kvm_write_edx_eax() in addition to the read
variant. Someone might want to do a patch and such, ^^hint hint^^...

:-)

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--
--
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/