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authorAvi Kivity <avi@qumranet.com>2007-02-22 17:39:30 (GMT)
committerAvi Kivity <avi@qumranet.com>2007-05-03 07:52:23 (GMT)
commit46fc1477887c41c8e900f2c95485e222b9a54822 (patch)
treeef9d4d4b6fc32f3d6b4e77a87d1b47b6da455574 /drivers/kvm/kvm.h
parent9a2bb7f486dc639a1cf2ad803bf2227f0dc0809d (diff)
downloadlinux-46fc1477887c41c8e900f2c95485e222b9a54822.tar.xz
KVM: Do not communicate to userspace through cpu registers during PIO
Currently when passing the a PIO emulation request to userspace, we rely on userspace updating %rax (on 'in' instructions) and %rsi/%rdi/%rcx (on string instructions). This (a) requires two extra ioctls for getting and setting the registers and (b) is unfriendly to non-x86 archs, when they get kvm ports. So fix by doing the register fixups in the kernel and passing to userspace only an abstract description of the PIO to be done. Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/kvm.h')
-rw-r--r--drivers/kvm/kvm.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 901b8d9..59cbc5b 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -274,6 +274,7 @@ struct kvm_vcpu {
int mmio_size;
unsigned char mmio_data[8];
gpa_t mmio_phys_addr;
+ int pio_pending;
struct {
int active;