f3383cf80e
Old guests try to use the magic page, but map their trampoline code inside of an NX region. Since we can't fix those old kernels, try to detect whether the guest is sane or not. If not, just disable NX functionality in KVM so that old guests at least work at all. For newer guests, add a bit that we can set to keep NX functionality available. Signed-off-by: Alexander Graf <agraf@suse.de>
98 lines
2.7 KiB
C
98 lines
2.7 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 _UAPI__POWERPC_KVM_PARA_H__
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#define _UAPI__POWERPC_KVM_PARA_H__
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#include <linux/types.h>
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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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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; /* dear on BookE */
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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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__u32 sr[16];
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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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};
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#define KVM_SC_MAGIC_R0 0x4b564d21 /* "KVM!" */
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#define KVM_HCALL_TOKEN(num) _EV_HCALL_TOKEN(EV_KVM_VENDOR_ID, num)
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#include <asm/epapr_hcalls.h>
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#define KVM_FEATURE_MAGIC_PAGE 1
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/* Magic page flags from host to guest */
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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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/* Magic page flags from guest to host */
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#define MAGIC_PAGE_FLAG_NOT_MAPPED_NX (1 << 0)
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#endif /* _UAPI__POWERPC_KVM_PARA_H__ */
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