From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: New CPUID/MSR driver; virtualization hooks Date: Wed, 04 Apr 2007 17:50:58 -0700 Message-ID: <461447F2.9010807@zytor.com> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org To: Virtualization Mailing List List-Id: virtualization@lists.linuxfoundation.org I have finally gotten off the pot and finished writing up my new = CPUID/MSR driver, which contains support for registers that need = arbitrary GPRs touched. For i386 vs x86-64 compatibility, both use an = x86-64 register image (16 64-bit register fields); this allows 32-bit = userspace to access the full 64-bit image if the kernel is 64 bits. Anyway, this presumably requires new paravirtualization hooks. The = patch is at: http://www.kernel.org/pub/linux/kernel/people/hpa/new-cpuid-msr.patch ... and a git tree is at ... http://git.kernel.org/?p=3Dlinux/kernel/git/hpa/linux-2.6-cpuidmsr.git;a=3D= summary I'm posting this here to give the paravirt maintainers an opportunity to = comment. Presumably the functions that need to be paravirtualized are = the ones represented by the functions do_cpuid(), do_rdmsr() and = do_wrmsr(): they take a cpu number, an input register image, and an = output register image, and return either 0 or -EIO (in case of a trap.) -hpa