linux-kernel - [PATCH v19 086/130] KVM: TDX: restore debug store when TD exit

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Message-Id: <b7a96654fa46593417afa6153959b2989a507842.1708933498.git.isaku.yamahata@intel.com>
Date: Mon, 26 Feb 2024 00:26:28 -0800
From: isaku.yamahata@...el.com
To: kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: isaku.yamahata@...el.com,
	isaku.yamahata@...il.com,
	Paolo Bonzini <pbonzini@...hat.com>,
	erdemaktas@...gle.com,
	Sean Christopherson <seanjc@...gle.com>,
	Sagi Shahar <sagis@...gle.com>,
	Kai Huang <kai.huang@...el.com>,
	chen.bo@...el.com,
	hang.yuan@...el.com,
	tina.zhang@...el.com
Subject: [PATCH v19 086/130] KVM: TDX: restore debug store when TD exit

From: Isaku Yamahata <isaku.yamahata@...el.com>

Because debug store is clobbered, restore it on TD exit.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/events/intel/ds.c | 1 +
 arch/x86/kvm/vmx/tdx.c     | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c
index d49d661ec0a7..25670d8a485b 100644
--- a/arch/x86/events/intel/ds.c
+++ b/arch/x86/events/intel/ds.c
@@ -2428,3 +2428,4 @@ void perf_restore_debug_store(void)
 
 	wrmsrl(MSR_IA32_DS_AREA, (unsigned long)ds);
 }
+EXPORT_SYMBOL_GPL(perf_restore_debug_store);
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index b8b168f74dfe..ad4d3d4eaf6c 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -665,6 +665,7 @@ fastpath_t tdx_vcpu_run(struct kvm_vcpu *vcpu)
 	tdx_vcpu_enter_exit(tdx);
 
 	tdx_user_return_update_cache(vcpu);
+	perf_restore_debug_store();
 	tdx_restore_host_xsave_state(vcpu);
 	tdx->host_state_need_restore = true;
 
-- 
2.25.1