2008-04-17 04:28:09 +00:00
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright IBM Corp. 2008
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*
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* Authors: Hollis Blanchard <hollisb@us.ibm.com>
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*/
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#ifndef __POWERPC_KVM_PARA_H__
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#define __POWERPC_KVM_PARA_H__
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2010-07-29 12:47:42 +00:00
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#include <linux/types.h>
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2012-01-11 13:37:35 +00:00
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/*
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* Additions to this struct must only occur at the end, and should be
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* accompanied by a KVM_MAGIC_FEAT flag to advertise that they are present
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* (albeit not necessarily relevant to the current target hardware platform).
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*
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* Struct fields are always 32 or 64 bit aligned, depending on them being 32
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* or 64 bit wide respectively.
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*
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* See Documentation/virtual/kvm/ppc-pv.txt
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*/
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2010-07-29 12:47:42 +00:00
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struct kvm_vcpu_arch_shared {
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2010-07-29 12:47:50 +00:00
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__u64 scratch1;
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__u64 scratch2;
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__u64 scratch3;
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2010-07-29 12:47:49 +00:00
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__u64 critical; /* Guest may not get interrupts if == r1 */
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2010-07-29 12:47:47 +00:00
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__u64 sprg0;
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__u64 sprg1;
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__u64 sprg2;
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__u64 sprg3;
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2010-07-29 12:47:46 +00:00
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__u64 srr0;
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__u64 srr1;
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KVM: PPC: Paravirtualize SPRG4-7, ESR, PIR, MASn
This allows additional registers to be accessed by the guest
in PR-mode KVM without trapping.
SPRG4-7 are readable from userspace. On booke, KVM will sync
these registers when it enters the guest, so that accesses from
guest userspace will work. The guest kernel, OTOH, must consistently
use either the real registers or the shared area between exits. This
also applies to the already-paravirted SPRG3.
On non-booke, it's not clear to what extent SPRG4-7 are supported
(they're not architected for book3s, but exist on at least some classic
chips). They are copied in the get/set regs ioctls, but I do not see any
non-booke emulation. I also do not see any syncing with real registers
(in PR-mode) including the user-readable SPRG3. This patch should not
make that situation any worse.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
2011-11-09 00:23:30 +00:00
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__u64 dar; /* dear on BookE */
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2010-07-29 12:47:43 +00:00
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__u64 msr;
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2010-07-29 12:47:44 +00:00
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__u32 dsisr;
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2010-07-29 12:47:51 +00:00
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__u32 int_pending; /* Tells the guest if we have an interrupt */
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2010-08-03 00:29:27 +00:00
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__u32 sr[16];
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KVM: PPC: Paravirtualize SPRG4-7, ESR, PIR, MASn
This allows additional registers to be accessed by the guest
in PR-mode KVM without trapping.
SPRG4-7 are readable from userspace. On booke, KVM will sync
these registers when it enters the guest, so that accesses from
guest userspace will work. The guest kernel, OTOH, must consistently
use either the real registers or the shared area between exits. This
also applies to the already-paravirted SPRG3.
On non-booke, it's not clear to what extent SPRG4-7 are supported
(they're not architected for book3s, but exist on at least some classic
chips). They are copied in the get/set regs ioctls, but I do not see any
non-booke emulation. I also do not see any syncing with real registers
(in PR-mode) including the user-readable SPRG3. This patch should not
make that situation any worse.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
2011-11-09 00:23:30 +00:00
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__u32 mas0;
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__u32 mas1;
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__u64 mas7_3;
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__u64 mas2;
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__u32 mas4;
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__u32 mas6;
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__u32 esr;
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__u32 pir;
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/*
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* SPRG4-7 are user-readable, so we can only keep these consistent
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* between the shared area and the real registers when there's an
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* intervening exit to KVM. This also applies to SPRG3 on some
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* chips.
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*
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* This suffices for access by guest userspace, since in PR-mode
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* KVM, an exit must occur when changing the guest's MSR[PR].
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* If the guest kernel writes to SPRG3-7 via the shared area, it
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* must also use the shared area for reading while in kernel space.
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*/
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__u64 sprg4;
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__u64 sprg5;
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__u64 sprg6;
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__u64 sprg7;
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2010-07-29 12:47:42 +00:00
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};
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2010-07-29 12:47:48 +00:00
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#define KVM_SC_MAGIC_R0 0x4b564d21 /* "KVM!" */
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#define HC_VENDOR_KVM (42 << 16)
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#define HC_EV_SUCCESS 0
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#define HC_EV_UNIMPLEMENTED 12
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2010-07-29 12:47:55 +00:00
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#define KVM_FEATURE_MAGIC_PAGE 1
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KVM: PPC: Paravirtualize SPRG4-7, ESR, PIR, MASn
This allows additional registers to be accessed by the guest
in PR-mode KVM without trapping.
SPRG4-7 are readable from userspace. On booke, KVM will sync
these registers when it enters the guest, so that accesses from
guest userspace will work. The guest kernel, OTOH, must consistently
use either the real registers or the shared area between exits. This
also applies to the already-paravirted SPRG3.
On non-booke, it's not clear to what extent SPRG4-7 are supported
(they're not architected for book3s, but exist on at least some classic
chips). They are copied in the get/set regs ioctls, but I do not see any
non-booke emulation. I also do not see any syncing with real registers
(in PR-mode) including the user-readable SPRG3. This patch should not
make that situation any worse.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
2011-11-09 00:23:30 +00:00
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#define KVM_MAGIC_FEAT_SR (1 << 0)
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/* MASn, ESR, PIR, and high SPRGs */
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#define KVM_MAGIC_FEAT_MAS0_TO_SPRG7 (1 << 1)
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2010-08-03 09:32:56 +00:00
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2008-04-17 04:28:09 +00:00
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#ifdef __KERNEL__
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2010-07-29 12:47:48 +00:00
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#ifdef CONFIG_KVM_GUEST
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2010-09-03 08:22:19 +00:00
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#include <linux/of.h>
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2010-07-29 12:47:48 +00:00
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static inline int kvm_para_available(void)
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{
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struct device_node *hyper_node;
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hyper_node = of_find_node_by_path("/hypervisor");
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if (!hyper_node)
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return 0;
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if (!of_device_is_compatible(hyper_node, "linux,kvm"))
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return 0;
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return 1;
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}
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extern unsigned long kvm_hypercall(unsigned long *in,
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unsigned long *out,
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unsigned long nr);
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#else
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2008-04-17 04:28:09 +00:00
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static inline int kvm_para_available(void)
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{
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return 0;
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}
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2010-07-29 12:47:48 +00:00
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static unsigned long kvm_hypercall(unsigned long *in,
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unsigned long *out,
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unsigned long nr)
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{
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return HC_EV_UNIMPLEMENTED;
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}
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#endif
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static inline long kvm_hypercall0_1(unsigned int nr, unsigned long *r2)
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{
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unsigned long in[8];
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unsigned long out[8];
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unsigned long r;
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r = kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
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*r2 = out[0];
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return r;
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}
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static inline long kvm_hypercall0(unsigned int nr)
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{
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unsigned long in[8];
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unsigned long out[8];
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return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
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}
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static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
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{
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unsigned long in[8];
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unsigned long out[8];
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in[0] = p1;
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return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
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}
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static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
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unsigned long p2)
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{
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unsigned long in[8];
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unsigned long out[8];
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in[0] = p1;
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in[1] = p2;
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return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
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}
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static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
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unsigned long p2, unsigned long p3)
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{
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unsigned long in[8];
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unsigned long out[8];
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in[0] = p1;
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in[1] = p2;
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in[2] = p3;
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return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
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}
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static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
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unsigned long p2, unsigned long p3,
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unsigned long p4)
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{
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unsigned long in[8];
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unsigned long out[8];
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in[0] = p1;
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in[1] = p2;
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in[2] = p3;
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in[3] = p4;
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return kvm_hypercall(in, out, nr | HC_VENDOR_KVM);
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}
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2008-04-17 04:28:09 +00:00
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static inline unsigned int kvm_arch_para_features(void)
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{
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2010-07-29 12:47:48 +00:00
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unsigned long r;
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if (!kvm_para_available())
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return 0;
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if(kvm_hypercall0_1(KVM_HC_FEATURES, &r))
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return 0;
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return r;
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2008-04-17 04:28:09 +00:00
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}
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#endif /* __KERNEL__ */
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#endif /* __POWERPC_KVM_PARA_H__ */
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