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

Nicolas Saenz Julienne
2024-06-09T15:54:59Z

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 <nsaenz@amazon.com>
---
arch/x86/kvm/hyperv.c | 3 +++
include/asm-generic/hyperv-tlfs.h | 1 +
2 files changed, 4 insertions(+)

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
--
2.40.1