redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

KVM: x86: Use KVM cpu caps to track UMIP emulation 

Set UMIP in kvm_cpu_caps when it is emulated by VMX, even though the
bit will effectively be dropped by do_host_cpuid().  This allows
checking for UMIP emulation via kvm_cpu_caps instead of a dedicated
kvm_x86_ops callback.

No functional change intended.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
alistair/sensors
Sean Christopherson 2020-03-02 15:56:47 -08:00 committed by Paolo Bonzini
parent c10398b6d0
commit 90d2f60f41
4 changed files with 8 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/include/asm/kvm_host.h
View File

@ -1177,7 +1177,6 @@ struct kvm_x86_ops {
void (*handle_exit_irqoff)(struct kvm_vcpu *vcpu,
enum exit_fastpath_completion *exit_fastpath);
bool (*umip_emulated)(void);
bool (*pt_supported)(void);
int (*check_nested_events)(struct kvm_vcpu *vcpu);

6
arch/x86/kvm/svm.c
View File

@ -6088,11 +6088,6 @@ static bool svm_rdtscp_supported(void)
return boot_cpu_has(X86_FEATURE_RDTSCP);
}
static bool svm_umip_emulated(void)
{
return false;
}
static bool svm_pt_supported(void)
{
return false;
@ -7460,7 +7455,6 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.cpuid_update = svm_cpuid_update,
.rdtscp_supported = svm_rdtscp_supported,
.umip_emulated = svm_umip_emulated,
.pt_supported = svm_pt_supported,
.set_supported_cpuid = svm_set_supported_cpuid,

8
arch/x86/kvm/vmx/vmx.c
View File

@ -7132,6 +7132,10 @@ static void vmx_set_supported_cpuid(struct kvm_cpuid_entry2 *entry)
{
switch (entry->function) {
case 0x7:
/*
* UMIP needs to be manually set even though vmx_set_cpu_caps()
* also sets UMIP since do_host_cpuid() will drop it.
*/
if (vmx_umip_emulated())
cpuid_entry_set(entry, X86_FEATURE_UMIP);
break;
@ -7160,6 +7164,9 @@ static __init void vmx_set_cpu_caps(void)
if (enable_ept && boot_cpu_has(X86_FEATURE_OSPKE))
kvm_cpu_cap_check_and_set(X86_FEATURE_PKU);
if (vmx_umip_emulated())
kvm_cpu_cap_set(X86_FEATURE_UMIP);
/* CPUID 0xD.1 */
if (!vmx_xsaves_supported())
kvm_cpu_cap_clear(X86_FEATURE_XSAVES);
@ -7963,7 +7970,6 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
.check_intercept = vmx_check_intercept,
.handle_exit_irqoff = vmx_handle_exit_irqoff,
.umip_emulated = vmx_umip_emulated,
.pt_supported = vmx_pt_supported,
.request_immediate_exit = vmx_request_immediate_exit,

2
arch/x86/kvm/x86.c
View File

@ -928,7 +928,7 @@ static u64 kvm_host_cr4_reserved_bits(struct cpuinfo_x86 *c)
if (kvm_cpu_cap_has(X86_FEATURE_LA57))
reserved_bits &= ~X86_CR4_LA57;
if (kvm_x86_ops->umip_emulated())
if (kvm_cpu_cap_has(X86_FEATURE_UMIP))
reserved_bits &= ~X86_CR4_UMIP;
return reserved_bits;