Re: [PATCH 00/27] Add KVM support for Book3s_64 (PPC64) hosts v5

On 21.10.2009, at 17:03, Alexander Graf wrote: KVM for PowerPC only supports embedded cores at the moment. While it makes sense to virtualize on small machines, it's even more fun to do so on big boxes. So I figured we need KVM for PowerPC64 as well. This patchset implements KVM support fo

[PATCH 05/27] Add asm/kvm_book3s.h

This adds the book3s specific header file that contains structs that are only valid on book3s specific code. Signed-off-by: Alexander Graf --- v3 -> v4: - use context_id instead of mm_alloc --- arch/powerpc/include/asm/kvm_book3s.h | 136 + 1 files changed,

[PATCH 04/27] Add Book3s fields to vcpu structs

We need to store more information than we currently have for vcpus when running on Book3s. So let's extend the internal struct definitions. Signed-off-by: Alexander Graf --- v3 -> v4: - use context_id instead of mm_context v4 -> v5: - always include pvr in vcpu struct --- arch/powerpc/

[PATCH 08/27] Add SLB switching code for entry/exit

This is the really low level of guest entry/exit code. Book3s_64 has an SLB, which stores all ESID -> VSID mappings we're currently aware of. The segments in the guest differ from the ones on the host, so we need to switch the SLB to tell the MMU that we're in a new context. So we store a shadow

[PATCH 07/27] Add book3s_64 highmem asm code

This is the of entry / exit code. In order to switch between host and guest context, we need to switch register state and call the exit code handler on exit. This assembly file does exactly that. To finally enter the guest it calls into book3s_64_slb.S. On exit it gets jumped at from book3s_64_slb

[PATCH 16/27] Add desktop PowerPC specific emulation

Little opcodes behave differently on desktop and embedded PowerPC cores. In order to reflect those differences, let's add some #ifdef code to emulate.c. We could probably also handle them in the core specific emulation files, but I would prefer to reuse as much code as possible. Signed-off-by: Al

[PATCH 12/27] Add book3s_64 guest MMU

To be able to run a guest, we also need to implement a guest MMU. This patch adds MMU handling for Book3s_64 guests. Signed-off-by: Alexander Graf --- arch/powerpc/kvm/book3s_64_mmu.c | 469 ++ 1 files changed, 469 insertions(+), 0 deletions(-) create mode

[PATCH 19/27] Export symbols for KVM module

We want to be able to build KVM as a module. To enable us doing so, we need some more exports from core Linux parts. This patch exports all functions and variables that are required for KVM. Signed-off-by: Alexander Graf --- v3 -> v4: - don't export switch_slb - don't export init_context

[PATCH 24/27] Include Book3s_64 target in buildsystem

Now we have everything in place to be able to build KVM, so let's add it as config option and in the Makefile. Signed-off-by: Alexander Graf --- arch/powerpc/kvm/Kconfig | 17 + arch/powerpc/kvm/Makefile | 27 +++ 2 files changed, 40 insertions(+), 4

[PATCH 02/27] Pass PVR in sregs

Right now sregs is unused on PPC, so we can use it for initialization of the CPU. KVM on BookE always virtualizes the host CPU. On Book3s we go a step further and take the PVR from userspace that tells us what kind of CPU we are supposed to virtualize, because we support Book3s_32 and Book3s_64 gu

[PATCH 11/27] Add book3s_64 Host MMU handling

We designed the Book3S port of KVM as modular as possible. Most of the code could be easily used on a Book3S_32 host as well. The main difference between 32 and 64 bit cores is the MMU. To keep things well separated, we treat the book3s_64 MMU as one possible compile option. This patch adds all t

[PATCH 13/27] Add book3s_32 guest MMU

This patch adds an implementation for a G3/G4 MMU, so we can run G3 and G4 guests in KVM on Book3s_64. Signed-off-by: Alexander Graf --- arch/powerpc/kvm/book3s_32_mmu.c | 354 ++ 1 files changed, 354 insertions(+), 0 deletions(-) create mode 100644 arch/pow

[PATCH 14/27] Add book3s_64 specific opcode emulation

There are generic parts of PowerPC that can be shared across all implementations and specific parts that only apply to BookE or desktop PPCs. This patch adds emulation for desktop specific opcodes that don't apply to BookE CPUs. Signed-off-by: Alexander Graf --- arch/powerpc/kvm/book3s_64_emula

[PATCH 15/27] Add mfdec emulation

We support setting the DEC to a certain value right now. Doing that basically triggers the CPU local timer. But there's also an mfdec command that enabled the OS to read the decrementor. This is required at least by all desktop and server PowerPC Linux kernels. It can't really hurt to allow embed

[PATCH 17/27] Make head_64.S aware of KVM real mode code

We need to run some KVM trampoline code in real mode. Unfortunately, real mode only covers 8MB on Cell so we need to squeeze ourselves as low as possible. Also, we need to trap interrupts to get us back from guest state to host state without telling Linux about it. This patch adds interrupt traps

[PATCH 18/27] Add Book3s_64 offsets to asm-offsets.c

We need to access some VCPU fields from assembly code. In order to get the proper offsets, we have to define them in asm-offsets.c. Signed-off-by: Alexander Graf --- arch/powerpc/kernel/asm-offsets.c | 13 + 1 files changed, 13 insertions(+), 0 deletions(-) diff --git a/arch/power

[PATCH 22/27] Add fields to PACA

For KVM we need to store some information in the PACA, so we need to extend it. This patch adds KVM SLB shadow related entries to the PACA and a field that indicates if we're inside a guest. Signed-off-by: Alexander Graf --- arch/powerpc/include/asm/paca.h |9 + 1 files changed, 9 i

[PATCH 20/27] Split init_new_context and destroy_context

For KVM we need to allocate a new context id, but don't really care about all the mm context around it. So let's split the alloc and destroy functions for the context id, so we can grab one without allocating an mm context. Signed-off-by: Alexander Graf --- arch/powerpc/include/asm/mmu_context.

[PATCH 03/27] Add Book3s definitions

We need quite a bunch of new constants for KVM on Book3s, so let's define them now. These constants will be used in later patches. Signed-off-by: Alexander Graf --- v3 -> v4 - remove old kernel compat code --- arch/powerpc/include/asm/kvm_asm.h | 39

[PATCH 21/27] Export KVM symbols for module

To be able to keep KVM as module, we need to export the SLB trampoline addresses to the module, so it knows where to jump to. Signed-off-by: Alexander Graf --- arch/powerpc/kvm/book3s_64_exports.c | 24 1 files changed, 24 insertions(+), 0 deletions(-) create mode 100

[PATCH 23/27] Export new PACA constants in asm-offsets

In order to access fields in the PACA from assembly code, we need to generate offsets using asm-offsets.c. So let's add the new PACA related bits, we just introduced! Signed-off-by: Alexander Graf --- arch/powerpc/kernel/asm-offsets.c |5 + 1 files changed, 5 insertions(+), 0 deletions(

[PATCH 25/27] Fix trace.h

It looks like the variable "pc" is defined. At least the current code always failed on me stating that "pc" is already defined somewhere else. Let's use _pc instead, because that doesn't collide. Is this the right approach? Does it break on 440 too? If not, why not? Signed-off-by: Alexander Graf

[PATCH 26/27] Use Little Endian for Dirty Bitmap

We currently use host endian long types to store information in the dirty bitmap. This works reasonably well on Little Endian targets, because the u32 after the first contains the next 32 bits. On Big Endian this breaks completely though, forcing us to be inventive here. So Ben suggested to alway

[PATCH 27/27] Use hrtimers for the decrementer

Following S390's good example we should use hrtimers for the decrementer too! This patch converts the timer from the old mechanism to hrtimers. Signed-off-by: Alexander Graf --- arch/powerpc/include/asm/kvm_host.h |6 -- arch/powerpc/kvm/emulate.c | 18 +++--- arch

[PATCH 10/27] Add book3s.c

This adds the book3s core handling file. Here everything that is generic to desktop PowerPC cores is handled, including interrupt injections, MSR settings, etc. It basically takes over the same role as booke.c for embedded PowerPCs. Signed-off-by: Alexander Graf --- v3 -> v4: - use context_

[PATCH 01/27] Move dirty logging code to sub-arch

PowerPC code handles dirty logging in the generic parts atm. While this is great for "return -ENOTSUPP", we need to be rather target specific when actually implementing it. So let's split it to implementation specific code, so we can implement it for book3s. Signed-off-by: Alexander Graf --- ar

[PATCH 09/27] Add interrupt handling code

Getting from host state to the guest is only half the story. We also need to return to our host context and handle whatever happened to get us out of the guest. On PowerPC every guest exit is an interrupt. So all we need to do is trap the host's interrupt handlers and get into our #VMEXIT code to

[PATCH 06/27] Add Book3s_64 intercept helpers

We need to intercept interrupt vectors. To do that, let's add a file we can always include which only activates the intercepts when we have then configured. Signed-off-by: Alexander Graf --- arch/powerpc/include/asm/kvm_book3s_64_asm.h | 58 ++ 1 files changed, 58 inser

[PATCH 00/27] Add KVM support for Book3s_64 (PPC64) hosts v5

KVM for PowerPC only supports embedded cores at the moment. While it makes sense to virtualize on small machines, it's even more fun to do so on big boxes. So I figured we need KVM for PowerPC64 as well. This patchset implements KVM support for Book3s_64 hosts and guest support for Book3s_64 and

[PATCH] Enable 32bit dirty log pointers on 64bit host

From: Arnd Bergmann With big endian userspace, we can't quite figure out if a pointer is 32 bit (shifted >> 32) or 64 bit when we read a 64 bit pointer. This is what happens with dirty logging. To get the pointer interpreted correctly, we thus need Arnd's patch to implement a compat layer for th