[07/18] KVM: x86: hyper-v: Exit on TranslateVirtualAddress hcall

Commit Message

Nicolas Saenz Julienne June 9, 2024, 3:49 p.m. UTC

Handle HvTranslateVirtualAddress in user-space. The hypercall is
VTL-aware and only used in the context of VSM. Additionally, the TLFS
doesn't introduce an ad-hoc CPUID bit for it, so the hypercall
availability is tracked as part of the HV_ACCESS_VSM CPUID. This will be
documented with the main VSM commit.

Signed-off-by: Nicolas Saenz Julienne <[e-mail]>
---
 arch/x86/kvm/hyperv.c             | 3 +++
 include/asm-generic/hyperv-tlfs.h | 1 +
 2 files changed, 4 insertions(+)

Patch

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index d0edc2bec5a4f..cbe2aca52514b 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -2427,6 +2427,7 @@  static bool kvm_hv_is_xmm_output_hcall(u16 code)
 {
 	switch (code) {
 	case HVCALL_GET_VP_REGISTERS:
+	case HVCALL_TRANSLATE_VIRTUAL_ADDRESS:
 		return true;
 	}
 
@@ -2512,6 +2513,7 @@  static bool is_xmm_fast_hypercall(struct kvm_hv_hcall *hc)
 	case HVCALL_SEND_IPI_EX:
 	case HVCALL_GET_VP_REGISTERS:
 	case HVCALL_SET_VP_REGISTERS:
+	case HVCALL_TRANSLATE_VIRTUAL_ADDRESS:
 		return true;
 	}
 
@@ -2740,6 +2742,7 @@  int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
 		goto hypercall_userspace_exit;
 	case HVCALL_GET_VP_REGISTERS:
 	case HVCALL_SET_VP_REGISTERS:
+	case HVCALL_TRANSLATE_VIRTUAL_ADDRESS:
 		goto hypercall_userspace_exit;
 	default:
 		ret = HV_STATUS_INVALID_HYPERCALL_CODE;
diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
index 9e909f0834598..57c791c555861 100644
--- a/include/asm-generic/hyperv-tlfs.h
+++ b/include/asm-generic/hyperv-tlfs.h
@@ -159,6 +159,7 @@  union hv_reference_tsc_msr {
 #define HVCALL_CREATE_VP			0x004e
 #define HVCALL_GET_VP_REGISTERS			0x0050
 #define HVCALL_SET_VP_REGISTERS			0x0051
+#define HVCALL_TRANSLATE_VIRTUAL_ADDRESS	0x0052
 #define HVCALL_POST_MESSAGE			0x005c
 #define HVCALL_SIGNAL_EVENT			0x005d
 #define HVCALL_POST_DEBUG_DATA			0x0069