linux-kernel - [PATCH RFC 05/39] KVM: x86/xen: update wallclock region

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Message-Id: <20190220201609.28290-6-joao.m.martins@oracle.com>
Date:   Wed, 20 Feb 2019 20:15:35 +0000
From:   Joao Martins <joao.m.martins@...cle.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ankur Arora <ankur.a.arora@...cle.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Joao Martins <joao.m.martins@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org
Subject: [PATCH RFC 05/39] KVM: x86/xen: update wallclock region


Wallclock on Xen is written in the shared_info page.

To that purpose, export kvm_write_wall_clock() and pass on the GPA of
its location to populate the shared_info wall clock data.

Signed-off-by: Joao Martins <joao.m.martins@...cle.com>
---
 arch/x86/kvm/x86.c | 2 +-
 arch/x86/kvm/x86.h | 1 +
 arch/x86/kvm/xen.c | 3 +++
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6eb2afaa2af2..31a102b22042 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1418,7 +1418,7 @@ void kvm_set_pending_timer(struct kvm_vcpu *vcpu)
 	kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
 }
 
-static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
+void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
 {
 	int version;
 	int r;
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index 28406aa1136d..b5f2e66a4c81 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -256,6 +256,7 @@ static inline bool kvm_check_has_quirk(struct kvm *kvm, u64 quirk)
 }
 
 void kvm_set_pending_timer(struct kvm_vcpu *vcpu);
+void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock);
 int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip);
 
 void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr);
diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index b4bd1949656e..879bcfdd7b1d 100644
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c
@@ -19,6 +19,7 @@ static int kvm_xen_shared_info_init(struct kvm *kvm, gfn_t gfn)
 {
 	struct shared_info *shared_info;
 	struct page *page;
+	gpa_t gpa = gfn_to_gpa(gfn);
 
 	page = gfn_to_page(kvm, gfn);
 	if (is_error_page(page))
@@ -30,6 +31,8 @@ static int kvm_xen_shared_info_init(struct kvm *kvm, gfn_t gfn)
 	memset(shared_info, 0, sizeof(struct shared_info));
 	kvm->arch.xen.shinfo = shared_info;
 
+	kvm_write_wall_clock(kvm, gpa + offsetof(struct shared_info, wc));
+
 	kvm_make_all_cpus_request(kvm, KVM_REQ_MASTERCLOCK_UPDATE);
 	return 0;
 }
-- 
2.11.0