a7y18lte-ubports/android_kernel_samsung_a7y18lte
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

KVM: nVMX: Refactor IO bitmap checks into helper function

Browse Source 
commit e71237d3ff1abf9f3388337cfebf53b96df2020d upstream.

Checks against the IO bitmap are useful for both instruction emulation
and VM-exit reflection. Refactor the IO bitmap checks into a helper
function.

Signed-off-by: Oliver Upton <oupton@google.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Upton 2020-02-04 15:26:30 -08:00 committed by prashantpaddune
parent 332d9f14c1
commit 00a418faef
1 changed files with 27 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
arch/x86/kvm/vmx.c
View File

@ -4275,6 +4275,26 @@ static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu)
(ss.selector & SEGMENT_RPL_MASK));
}
static bool nested_vmx_check_io_bitmaps(struct kvm_vcpu *vcpu,
unsigned int port, int size);
static bool nested_vmx_exit_handled_io(struct kvm_vcpu *vcpu,
struct vmcs12 *vmcs12)
{
unsigned long exit_qualification;
unsigned int port;
int size;
if (!nested_cpu_has(vmcs12, CPU_BASED_USE_IO_BITMAPS))
return nested_cpu_has(vmcs12, CPU_BASED_UNCOND_IO_EXITING);
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
port = exit_qualification >> 16;
size = (exit_qualification & 7) + 1;
return nested_vmx_check_io_bitmaps(vcpu, port, size);
}
/*
* Check if guest state is valid. Returns true if valid, false if
* not.
@ -7624,23 +7644,17 @@ static int (*const kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
static const int kvm_vmx_max_exit_handlers =
ARRAY_SIZE(kvm_vmx_exit_handlers);
static bool nested_vmx_exit_handled_io(struct kvm_vcpu *vcpu,
struct vmcs12 *vmcs12)
/*
* Return true if an IO instruction with the specified port and size should cause
* a VM-exit into L1.
*/
bool nested_vmx_check_io_bitmaps(struct kvm_vcpu *vcpu, unsigned int port,
int size)
{
unsigned long exit_qualification;
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
gpa_t bitmap, last_bitmap;
unsigned int port;
int size;
u8 b;
if (!nested_cpu_has(vmcs12, CPU_BASED_USE_IO_BITMAPS))
return nested_cpu_has(vmcs12, CPU_BASED_UNCOND_IO_EXITING);
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
port = exit_qualification >> 16;
size = (exit_qualification & 7) + 1;
last_bitmap = (gpa_t)-1;
b = -1;