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HV Cx: allow guest to access host idle port

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with this patch guest could access idle io port and enter idle normally.

Signed-off-by: Victor Sun <victor.sun@intel.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>
This commit is contained in:
Victor Sun
2018-04-27 11:53:23 +08:00
committed by Jack Ren
parent ebf184f038
commit 8b29ce1991
3 changed files with 33 additions and 0 deletions
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16
hypervisor/arch/x86/io.c
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@@ -190,6 +190,22 @@ void free_io_emulation_resource(struct vm *vm)
free(vm->arch_vm.iobitmap[1]);
}
void allow_guest_io_access(struct vm *vm, uint32_t address, uint32_t nbytes)
{
uint32_t *b;
uint32_t i;
uint32_t a;
b = vm->arch_vm.iobitmap[0];
for (i = 0; i < nbytes; i++) {
if (address & 0x8000)
b = vm->arch_vm.iobitmap[1];
a = address & 0x7fff;
b[a >> 5] &= ~(1 << (a & 0x1f));
address++;
}
}
static void deny_guest_io_access(struct vm *vm, uint32_t address, uint32_t nbytes)
{
uint32_t *b;