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| author | Paolo Bonzini <pbonzini@redhat.com> | 2022-11-07 03:49:59 -0500 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-11-09 12:25:33 -0500 |
| commit | e287bd005ad9d85dd6271dd795d3ecfb6bca46ad (patch) | |
| tree | 10e0fac1c9d0378b3af82dbc882c695352177e93 /arch/x86/kvm/svm/svm.c | |
| parent | e61ab42de874c5af8c5d98b327c77a374d9e7da1 (diff) | |
| download | linux-e287bd005ad9d85dd6271dd795d3ecfb6bca46ad.tar.gz linux-e287bd005ad9d85dd6271dd795d3ecfb6bca46ad.tar.bz2 linux-e287bd005ad9d85dd6271dd795d3ecfb6bca46ad.zip | |
KVM: SVM: restore host save area from assembly
Allow access to the percpu area via the GS segment base, which is
needed in order to access the saved host spec_ctrl value. In linux-next
FILL_RETURN_BUFFER also needs to access percpu data.
For simplicity, the physical address of the save area is added to struct
svm_cpu_data.
Cc: stable@vger.kernel.org
Fixes: a149180fbcf3 ("x86: Add magic AMD return-thunk")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Analyzed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm/svm.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 4e3a47eb5002..469c1b5617af 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -592,7 +592,7 @@ static int svm_hardware_enable(void) wrmsrl(MSR_EFER, efer | EFER_SVME); - wrmsrl(MSR_VM_HSAVE_PA, __sme_page_pa(sd->save_area)); + wrmsrl(MSR_VM_HSAVE_PA, sd->save_area_pa); if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) { /* @@ -648,6 +648,7 @@ static void svm_cpu_uninit(int cpu) kfree(sd->sev_vmcbs); __free_page(sd->save_area); + sd->save_area_pa = 0; sd->save_area = NULL; } @@ -665,6 +666,7 @@ static int svm_cpu_init(int cpu) if (ret) goto free_save_area; + sd->save_area_pa = __sme_page_pa(sd->save_area); return 0; free_save_area: @@ -1450,7 +1452,7 @@ static void svm_prepare_switch_to_guest(struct kvm_vcpu *vcpu) * Save additional host state that will be restored on VMEXIT (sev-es) * or subsequent vmload of host save area. */ - vmsave(__sme_page_pa(sd->save_area)); + vmsave(sd->save_area_pa); if (sev_es_guest(vcpu->kvm)) { struct sev_es_save_area *hostsa; hostsa = (struct sev_es_save_area *)(page_address(sd->save_area) + 0x400); @@ -3905,14 +3907,10 @@ static noinstr void svm_vcpu_enter_exit(struct kvm_vcpu *vcpu) guest_state_enter_irqoff(); - if (sev_es_guest(vcpu->kvm)) { + if (sev_es_guest(vcpu->kvm)) __svm_sev_es_vcpu_run(svm); - } else { - struct svm_cpu_data *sd = per_cpu_ptr(&svm_data, vcpu->cpu); - + else __svm_vcpu_run(svm); - vmload(__sme_page_pa(sd->save_area)); - } guest_state_exit_irqoff(); } |