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kvm tools: ARM: allow potential relocation of IO port

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Whilst our IO port is fixed at CPU physical address 0x0, changing
ARM_IOPORT_AREA should be all that's necessary to move it around in CPU
physical space (it will still be at 0x0 in the bus address space).

This patch ensures we subtract KVM_IOPORT_AREA from the faulting CPU
physical address when calculating the port for kvm__emulate_io.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Will Deacon
2014-04-17 15:57:48 +01:00
parent 1fcf0d7773
commit c3e5e10138
1 changed files with 1 additions and 1 deletions
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arm/kvm-cpu.c
+1 -1
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@@ -105,7 +105,7 @@ bool kvm_cpu__emulate_mmio(struct kvm *kvm, u64 phys_addr, u8 *data, u32 len,
return kvm__emulate_mmio(kvm, phys_addr, data, len, is_write);
} else if (arm_addr_in_ioport_region(phys_addr)) {
int direction = is_write ? KVM_EXIT_IO_OUT : KVM_EXIT_IO_IN;
u16 port = phys_addr & USHRT_MAX;
u16 port = (phys_addr - KVM_IOPORT_AREA) & USHRT_MAX;
return kvm__emulate_io(kvm, port, data, direction, len, 1);
} else if (arm_addr_in_pci_region(phys_addr)) {
return kvm__emulate_mmio(kvm, phys_addr, data, len, is_write);