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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d9bab50aa4
Disappointing, as this was kind of neat (especially getting to use RCU to manage the address -> eventfd mapping). But now the devices are PCI handled in userspace, we get rid of both the NOTIFY hypercall and the interface to connect an eventfd. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
45 lines
1.5 KiB
C
45 lines
1.5 KiB
C
#ifndef _LINUX_LGUEST_LAUNCHER
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#define _LINUX_LGUEST_LAUNCHER
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/* Everything the "lguest" userspace program needs to know. */
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#include <linux/types.h>
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/*D:010
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* Drivers
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*
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* The Guest needs devices to do anything useful. Since we don't let it touch
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* real devices (think of the damage it could do!) we provide virtual devices.
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* We emulate a PCI bus with virtio devices on it; we used to have our own
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* lguest bus which was far simpler, but this tests the virtio 1.0 standard.
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*
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* Virtio devices are also used by kvm, so we can simply reuse their optimized
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* device drivers. And one day when everyone uses virtio, my plan will be
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* complete. Bwahahahah!
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*/
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/* Write command first word is a request. */
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enum lguest_req
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{
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LHREQ_INITIALIZE, /* + base, pfnlimit, start */
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LHREQ_GETDMA, /* No longer used */
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LHREQ_IRQ, /* + irq */
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LHREQ_BREAK, /* No longer used */
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LHREQ_EVENTFD, /* No longer used. */
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LHREQ_GETREG, /* + offset within struct pt_regs (then read value). */
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LHREQ_SETREG, /* + offset within struct pt_regs, value. */
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LHREQ_TRAP, /* + trap number to deliver to guest. */
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};
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/*
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* This is what read() of the lguest fd populates. trap ==
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* LGUEST_TRAP_ENTRY for an LHCALL_NOTIFY (addr is the
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* argument), 14 for a page fault in the MMIO region (addr is
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* the trap address, insn is the instruction), or 13 for a GPF
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* (insn is the instruction).
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*/
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struct lguest_pending {
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__u8 trap;
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__u8 insn[7];
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__u32 addr;
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};
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#endif /* _LINUX_LGUEST_LAUNCHER */
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