Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=8cb5b0333250beb382624f626851a31f601b4830
Commit: 8cb5b0333250beb382624f626851a31f601b4830
Parent: aac012245a59d78372dc66d292ba567367d86b60
Author: Avi Kivity <[EMAIL PROTECTED]>
AuthorDate: Tue Mar 20 18:40:40 2007 +0200
Committer: Avi Kivity <[EMAIL PROTECTED]>
CommitDate: Thu May 3 10:52:25 2007 +0300
KVM: Workaround vmx inability to virtualize the reset state
The reset state has cs.selector == 0xf000 and cs.base == 0xffff0000,
which aren't compatible with vm86 mode, which is used for real mode
virtualization.
When we create a vcpu, we set cs.base to 0xf0000, but if we get there by
way of a reset, the values are inconsistent and vmx refuses to enter
guest mode.
Workaround by detecting the state and munging it appropriately.
Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
---
drivers/kvm/vmx.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 0d9bf0b..aa7e2ba 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -712,6 +712,8 @@ static void enter_rmode(struct kvm_vcpu *vcpu)
vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
vmcs_write32(GUEST_CS_LIMIT, 0xffff);
+ if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
+ vmcs_writel(GUEST_CS_BASE, 0xf0000);
vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
fix_rmode_seg(VCPU_SREG_ES, &vcpu->rmode.es);
-
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