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KVM: Fix page-crossing MMIO

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MMIO that are split across a page boundary are currently broken - the
code does not expect to be aborted by the exit to userspace for the
first MMIO fragment.

This patch fixes the problem by generalizing the current code for handling
16-byte MMIOs to handle a number of "fragments", and changes the MMIO
code to create those fragments.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Avi Kivity
2012-04-18 19:22:47 +03:00
committed by Marcelo Tosatti
parent eac0556750
commit f78146b0f9
4 changed files with 115 additions and 42 deletions
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arch/ia64/include/asm/kvm_host.h
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@@ -449,6 +449,8 @@ struct kvm_vcpu_arch {
char log_buf[VMM_LOG_LEN];
union context host;
union context guest;
char mmio_data[8];
};
struct kvm_vm_stat {