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

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Date: Sun, 9 Jun 2024 15:49:36 +0000
From: Nicolas Saenz Julienne <nsaenz@...zon.com>
To: <linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>
CC: <pbonzini@...hat.com>, <seanjc@...gle.com>, <vkuznets@...hat.com>,
	<linux-doc@...r.kernel.org>, <linux-hyperv@...r.kernel.org>,
	<linux-arch@...r.kernel.org>, <linux-trace-kernel@...r.kernel.org>,
	<graf@...zon.de>, <dwmw2@...radead.org>, <paul@...zon.com>,
	<nsaenz@...zon.com>, <mlevitsk@...hat.com>, <jgowans@...zon.com>,
	<corbet@....net>, <decui@...rosoft.com>, <tglx@...utronix.de>,
	<mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>,
	<x86@...nel.org>, <amoorthy@...gle.com>
Subject: [PATCH 07/18] KVM: x86: hyper-v: Exit on TranslateVirtualAddress hcall

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@...zon.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