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7508e16c9f
We will soon add SR PV support to the shared page, so we need some infrastructure that allows the guest to query for features KVM exports. This patch adds a second return value to the magic mapping that indicated to the guest which features are available. Signed-off-by: Alexander Graf <agraf@suse.de>
173 lines
3.5 KiB
C
173 lines
3.5 KiB
C
/*
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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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#include <linux/types.h>
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#include <linux/of.h>
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struct kvm_vcpu_arch_shared {
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__u64 scratch1;
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__u64 scratch2;
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__u64 scratch3;
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__u64 critical; /* Guest may not get interrupts if == r1 */
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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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__u64 srr0;
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__u64 srr1;
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__u64 dar;
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__u64 msr;
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__u32 dsisr;
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__u32 int_pending; /* Tells the guest if we have an interrupt */
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};
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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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#define KVM_FEATURE_MAGIC_PAGE 1
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#define KVM_MAGIC_FEAT_SR (1 << 0)
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#ifdef __KERNEL__
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#ifdef CONFIG_KVM_GUEST
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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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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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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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static inline unsigned int kvm_arch_para_features(void)
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{
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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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}
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#endif /* __KERNEL__ */
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#endif /* __POWERPC_KVM_PARA_H__ */
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