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KVM: SVM: Add AP_JUMP_TABLE support in prep for AP booting 

The GHCB specification requires the hypervisor to save the address of an
AP Jump Table so that, for example, vCPUs that have been parked by UEFI
can be started by the OS. Provide support for the AP Jump Table set/get
exit code.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Tom Lendacky 2020-12-15 12:44:07 -05:00 committed by Paolo Bonzini
parent ad73109ae7
commit 8640ca588b
2 changed files with 29 additions and 0 deletions
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28
arch/x86/kvm/svm/sev.c
View File

@ -18,6 +18,8 @@
#include <linux/trace_events.h>
#include <asm/fpu/internal.h>
#include <asm/trapnr.h>
#include "x86.h"
#include "svm.h"
#include "cpuid.h"
@ -1559,6 +1561,7 @@ static int sev_es_validate_vmgexit(struct vcpu_svm *svm)
goto vmgexit_err;
break;
case SVM_VMGEXIT_NMI_COMPLETE:
case SVM_VMGEXIT_AP_JUMP_TABLE:
case SVM_VMGEXIT_UNSUPPORTED_EVENT:
break;
default:
@ -1883,6 +1886,31 @@ int sev_handle_vmgexit(struct vcpu_svm *svm)
case SVM_VMGEXIT_NMI_COMPLETE:
ret = svm_invoke_exit_handler(svm, SVM_EXIT_IRET);
break;
case SVM_VMGEXIT_AP_JUMP_TABLE: {
struct kvm_sev_info *sev = &to_kvm_svm(svm->vcpu.kvm)->sev_info;
switch (control->exit_info_1) {
case 0:
/* Set AP jump table address */
sev->ap_jump_table = control->exit_info_2;
break;
case 1:
/* Get AP jump table address */
ghcb_set_sw_exit_info_2(ghcb, sev->ap_jump_table);
break;
default:
pr_err("svm: vmgexit: unsupported AP jump table request - exit_info_1=%#llx\n",
control->exit_info_1);
ghcb_set_sw_exit_info_1(ghcb, 1);
ghcb_set_sw_exit_info_2(ghcb,
X86_TRAP_UD |
SVM_EVTINJ_TYPE_EXEPT |
SVM_EVTINJ_VALID);
}
ret = 1;
break;
}
case SVM_VMGEXIT_UNSUPPORTED_EVENT:
vcpu_unimpl(&svm->vcpu,
"vmgexit: unsupported event - exit_info_1=%#llx, exit_info_2=%#llx\n",

1
arch/x86/kvm/svm/svm.h
View File

@ -78,6 +78,7 @@ struct kvm_sev_info {
int fd; /* SEV device fd */
unsigned long pages_locked; /* Number of pages locked */
struct list_head regions_list; /* List of registered regions */
u64 ap_jump_table; /* SEV-ES AP Jump Table address */
};
struct kvm_svm {