forked from mirrors/linux
b1c3497e60
Implement support for the HVMOP_set_evtchn_upcall_vector hypercall in order to set the per-vCPU event channel vector callback on Linux and use it in preference of HVM_PARAM_CALLBACK_IRQ. If the per-VCPU vector setup is successful on BSP, use this method for the APs. If not, fallback to the global vector-type callback. Also register callback_irq at per-vCPU event channel setup to trick toolstack to think the domain is enlightened. Suggested-by: "Roger Pau Monné" <roger.pau@citrix.com> Signed-off-by: Jane Malalane <jane.malalane@citrix.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Link: https://lore.kernel.org/r/20220729070416.23306-1-jane.malalane@citrix.com Signed-off-by: Juergen Gross <jgross@suse.com>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Simple wrappers around HVM functions */
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#ifndef XEN_HVM_H__
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#define XEN_HVM_H__
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#include <xen/interface/hvm/params.h>
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#include <asm/xen/hypercall.h>
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static const char *param_name(int op)
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{
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#define PARAM(x) [HVM_PARAM_##x] = #x
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static const char *const names[] = {
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PARAM(CALLBACK_IRQ),
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PARAM(STORE_PFN),
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PARAM(STORE_EVTCHN),
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PARAM(PAE_ENABLED),
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PARAM(IOREQ_PFN),
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PARAM(BUFIOREQ_PFN),
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PARAM(TIMER_MODE),
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PARAM(HPET_ENABLED),
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PARAM(IDENT_PT),
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PARAM(DM_DOMAIN),
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PARAM(ACPI_S_STATE),
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PARAM(VM86_TSS),
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PARAM(VPT_ALIGN),
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PARAM(CONSOLE_PFN),
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PARAM(CONSOLE_EVTCHN),
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};
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#undef PARAM
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if (op >= ARRAY_SIZE(names))
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return "unknown";
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if (!names[op])
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return "reserved";
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return names[op];
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}
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static inline int hvm_get_parameter(int idx, uint64_t *value)
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{
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struct xen_hvm_param xhv;
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int r;
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xhv.domid = DOMID_SELF;
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xhv.index = idx;
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r = HYPERVISOR_hvm_op(HVMOP_get_param, &xhv);
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if (r < 0) {
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pr_err("Cannot get hvm parameter %s (%d): %d!\n",
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param_name(idx), idx, r);
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return r;
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}
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*value = xhv.value;
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return r;
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}
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#define HVM_CALLBACK_VIA_TYPE_VECTOR 0x2
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#define HVM_CALLBACK_VIA_TYPE_SHIFT 56
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#define HVM_CALLBACK_VECTOR(x) (((uint64_t)HVM_CALLBACK_VIA_TYPE_VECTOR)<<\
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HVM_CALLBACK_VIA_TYPE_SHIFT | (x))
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void xen_setup_callback_vector(void);
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int xen_set_upcall_vector(unsigned int cpu);
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#endif /* XEN_HVM_H__ */
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