From: Michael Ellerman <mpe@ellerman.id.au>
To: Thiago Jung Bauermann <bauerman@linux.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org,
Alexey Kardashevskiy <aik@ozlabs.ru>,
Anshuman Khandual <anshuman.linux@gmail.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Christoph Hellwig <hch@lst.de>,
Mike Anderson <andmike@linux.ibm.com>,
Paul Mackerras <paulus@samba.org>, Ram Pai <linuxram@us.ibm.com>,
Claudio Carvalho <cclaudio@linux.ibm.com>,
Anshuman Khandual <khandual@linux.vnet.ibm.com>,
Thiago Jung Bauermann <bauerman@linux.ibm.com>
Subject: Re: [PATCH v3 08/16] powerpc/pseries/svm: Use shared memory for LPPACA structures
Date: Mon, 12 Aug 2019 22:36:11 +1000 [thread overview]
Message-ID: <875zn2sgqs.fsf@concordia.ellerman.id.au> (raw)
In-Reply-To: <20190806052237.12525-9-bauerman@linux.ibm.com>
Thiago Jung Bauermann <bauerman@linux.ibm.com> writes:
> From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
>
> LPPACA structures need to be shared with the host. Hence they need to be in
> shared memory. Instead of allocating individual chunks of memory for a
> given structure from memblock, a contiguous chunk of memory is allocated
> and then converted into shared memory. Subsequent allocation requests will
> come from the contiguous chunk which will be always shared memory for all
> structures.
>
> While we are able to use a kmem_cache constructor for the Debug Trace Log,
> LPPACAs are allocated very early in the boot process (before SLUB is
> available) so we need to use a simpler scheme here.
>
> Introduce helper is_svm_platform() which uses the S bit of the MSR to tell
> whether we're running as a secure guest.
>
> Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
> Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
> ---
> arch/powerpc/include/asm/svm.h | 26 ++++++++++++++++++++
> arch/powerpc/kernel/paca.c | 43 +++++++++++++++++++++++++++++++++-
> 2 files changed, 68 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/include/asm/svm.h b/arch/powerpc/include/asm/svm.h
> new file mode 100644
> index 000000000000..fef3740f46a6
> --- /dev/null
> +++ b/arch/powerpc/include/asm/svm.h
> @@ -0,0 +1,26 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * SVM helper functions
> + *
> + * Copyright 2019 Anshuman Khandual, IBM Corporation.
Are we sure this copyright date is correct?
cheers
next prev parent reply other threads:[~2019-08-12 12:36 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-06 5:22 [PATCH v3 00/16] Secure Virtual Machine Enablement Thiago Jung Bauermann
2019-08-06 5:22 ` [PATCH v3 01/16] powerpc/kernel: Add ucall_norets() ultravisor call handler Thiago Jung Bauermann
2019-08-06 5:22 ` [PATCH v3 02/16] powerpc/pseries: Introduce option to build secure virtual machines Thiago Jung Bauermann
2019-08-06 5:22 ` [RFC PATCH v3 03/16] powerpc: Add support for adding an ESM blob to the zImage wrapper Thiago Jung Bauermann
2019-08-06 5:22 ` [PATCH v3 04/16] powerpc/prom_init: Add the ESM call to prom_init Thiago Jung Bauermann
2019-08-06 5:22 ` [PATCH v3 05/16] powerpc/pseries/svm: Add helpers for UV_SHARE_PAGE and UV_UNSHARE_PAGE Thiago Jung Bauermann
2019-08-06 5:22 ` [PATCH v3 06/16] powerpc: Introduce the MSR_S bit Thiago Jung Bauermann
2019-08-06 5:22 ` [PATCH v3 07/16] powerpc/pseries: Add and use LPPACA_SIZE constant Thiago Jung Bauermann
2019-08-06 5:22 ` [PATCH v3 08/16] powerpc/pseries/svm: Use shared memory for LPPACA structures Thiago Jung Bauermann
2019-08-12 12:36 ` Michael Ellerman [this message]
2019-08-12 21:43 ` Thiago Jung Bauermann
2019-08-14 10:54 ` Michael Ellerman
2019-08-16 0:52 ` Thiago Jung Bauermann
2019-08-06 5:22 ` [PATCH v3 09/16] powerpc/pseries/svm: Use shared memory for Debug Trace Log (DTL) Thiago Jung Bauermann
2019-08-06 5:22 ` [PATCH v3 10/16] powerpc/pseries/svm: Unshare all pages before kexecing a new kernel Thiago Jung Bauermann
2019-08-06 5:22 ` [PATCH v3 11/16] powerpc/pseries/svm: Export guest SVM status to user space via sysfs Thiago Jung Bauermann
2019-08-12 13:03 ` Michael Ellerman
2019-08-12 23:21 ` Thiago Jung Bauermann
2019-08-15 6:30 ` Michael Ellerman
2019-08-16 0:49 ` Thiago Jung Bauermann
2019-08-06 5:22 ` [PATCH v3 12/16] powerpc/pseries/svm: Disable doorbells in SVM guests Thiago Jung Bauermann
2019-08-06 5:22 ` [PATCH v3 13/16] powerpc/pseries/iommu: Don't use dma_iommu_ops on secure guests Thiago Jung Bauermann
2019-08-06 5:48 ` Christoph Hellwig
2019-08-07 1:37 ` Thiago Jung Bauermann
2019-08-06 5:22 ` [PATCH v3 14/16] powerpc/pseries/svm: Force SWIOTLB for " Thiago Jung Bauermann
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