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KVM: 16-byte mmio support

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Since sse instructions can issue 16-byte mmios, we need to support them.  We
can't increase the kvm_run mmio buffer size to 16 bytes without breaking
compatibility, so instead we break the large mmios into two smaller 8-byte
ones.  Since the bus is 64-bit we aren't breaking any atomicity guarantees.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity
2010-01-20 12:01:20 +02:00
parent 5287f194bf
commit cef4dea07f
3 changed files with 32 additions and 10 deletions
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7
include/linux/kvm_host.h
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@ -27,6 +27,10 @@
#include <asm/kvm_host.h>
#ifndef KVM_MMIO_SIZE
#define KVM_MMIO_SIZE 8
#endif
/*
* vcpu->requests bit members
*/
@ -132,7 +136,8 @@ struct kvm_vcpu {
int mmio_read_completed;
int mmio_is_write;
int mmio_size;
unsigned char mmio_data[8];
int mmio_index;
unsigned char mmio_data[KVM_MMIO_SIZE];
gpa_t mmio_phys_addr;
#endif