linux-kernel - [PATCH v16 070/116] KVM: TDX: restore debug store when TD exit

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Date:   Mon, 16 Oct 2023 09:14:22 -0700
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>,
        David Matlack <dmatlack@...gle.com>,
        Kai Huang <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>, chen.bo@...el.com,
        hang.yuan@...el.com, tina.zhang@...el.com
Subject: [PATCH v16 070/116] 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 eb8dd8b8a1e8..58e86b726436 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 e29df39630e8..a4401ae851d4 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -639,6 +639,7 @@ 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