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authorAvi Kivity <avi@qumranet.com>2008-03-16 18:48:26 +0200
committerAvi Kivity <avi@qumranet.com>2008-03-25 10:22:16 +0200
commit5dc832628229d2736fab10523566855c3cda622d (patch)
tree9f2024d364073ba42a6fed317a5e66dd9999e28d /arch/x86
parenta4083c9271e0a697278e089f2c0b9a95363ada0a (diff)
downloadop-kernel-dev-5dc832628229d2736fab10523566855c3cda622d.zip
op-kernel-dev-5dc832628229d2736fab10523566855c3cda622d.tar.gz
KVM: VMX: Restore tss even on x86_64
The vmx hardware state restore restores the tss selector and base address, but not its length. Usually, this does not matter since most of the tss contents is within the default length of 0x67. However, if a process is using ioperm() to grant itself I/O port permissions, an additional bitmap within the tss, but outside the default length is consulted. The effect is that the process will receive a SIGSEGV instead of transparently accessing the port. Fix by restoring the tss length. Note that i386 had this working already. Closes bugzilla 10246. Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/kvm/vmx.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 94ea724..f2df03c 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -349,8 +349,6 @@ static void update_exception_bitmap(struct kvm_vcpu *vcpu)
static void reload_tss(void)
{
-#ifndef CONFIG_X86_64
-
/*
* VT restores TR but not its size. Useless.
*/
@@ -361,7 +359,6 @@ static void reload_tss(void)
descs = (void *)gdt.base;
descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
load_TR_desc();
-#endif
}
static void load_transition_efer(struct vcpu_vmx *vmx)
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