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i386/xen: Reserve Xen special pages for console, xenstore rings

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Xen has eight frames at 0xfeff8000 for this; we only really need two for
now and KVM puts the identity map at 0xfeffc000, so limit ourselves to
four.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
David Woodhouse 2022-12-27 19:02:23 +00:00
parent b746a77926
commit 8b57d5c523
2 changed files with 19 additions and 0 deletions
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9
include/sysemu/kvm_xen.h
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@ -30,4 +30,13 @@ uint16_t kvm_xen_get_gnttab_max_frames(void);
#define kvm_xen_has_cap(cap) (!!(kvm_xen_get_caps() & \
KVM_XEN_HVM_CONFIG_ ## cap))
#define XEN_SPECIAL_AREA_ADDR 0xfeff8000UL
#define XEN_SPECIAL_AREA_SIZE 0x4000UL
#define XEN_SPECIALPAGE_CONSOLE 0
#define XEN_SPECIALPAGE_XENSTORE 1
#define XEN_SPECIAL_PFN(x) ((XEN_SPECIAL_AREA_ADDR >> TARGET_PAGE_BITS) + \
XEN_SPECIALPAGE_##x)
#endif /* QEMU_SYSEMU_KVM_XEN_H */