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lguest: add iomem region, where guest page faults get sent to userspace.

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This lets us implement PCI.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2015-02-11 15:15:10 +10:30
parent d1c29465b8
commit 7313d5217e
5 changed files with 58 additions and 7 deletions
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7
drivers/lguest/lg.h
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@@ -97,8 +97,12 @@ struct lguest {
struct lg_cpu cpus[NR_CPUS];
unsigned int nr_cpus;
/* Valid guest memory pages must be < this. */
u32 pfn_limit;
/* Device memory is >= pfn_limit and < device_limit. */
u32 device_limit;
/*
* This provides the offset to the base of guest-physical memory in the
* Launcher.
@@ -200,7 +204,8 @@ void guest_pagetable_flush_user(struct lg_cpu *cpu);
void guest_set_pte(struct lg_cpu *cpu, unsigned long gpgdir,
unsigned long vaddr, pte_t val);
void map_switcher_in_guest(struct lg_cpu *cpu, struct lguest_pages *pages);
bool demand_page(struct lg_cpu *cpu, unsigned long cr2, int errcode);
bool demand_page(struct lg_cpu *cpu, unsigned long cr2, int errcode,
unsigned long *iomem);
void pin_page(struct lg_cpu *cpu, unsigned long vaddr);
bool __guest_pa(struct lg_cpu *cpu, unsigned long vaddr, unsigned long *paddr);
unsigned long guest_pa(struct lg_cpu *cpu, unsigned long vaddr);