[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <e57e13793023cf2e605b93e8681b520eb492197b.1605232743.git.isaku.yamahata@intel.com>
Date: Mon, 16 Nov 2020 10:26:11 -0800
From: isaku.yamahata@...el.com
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
"H . Peter Anvin" <hpa@...or.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Joerg Roedel <joro@...tes.org>, x86@...nel.org,
linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: isaku.yamahata@...el.com, isaku.yamahata@...il.com,
Sean Christopherson <sean.j.christopherson@...el.com>,
Tom Lendacky <thomas.lendacky@....com>
Subject: [RFC PATCH 26/67] KVM: x86: Add kvm_x86_ops .cache_gprs() and .flush_gprs()
From: Sean Christopherson <sean.j.christopherson@...el.com>
Add hooks to cache and flush GPRs and invoke them from KVM_GET_REGS and
KVM_SET_REGS respecitively. TDX will use the hooks to read/write GPRs
from TDX-SEAM on-demand (for debug TDs).
Cc: Tom Lendacky <thomas.lendacky@....com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/kvm/x86.c | 6 ++++++
2 files changed, 8 insertions(+)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 7537ba0bada2..01c78eeefef4 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1130,6 +1130,8 @@ struct kvm_x86_ops {
void (*set_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
void (*sync_dirty_debug_regs)(struct kvm_vcpu *vcpu);
void (*set_dr7)(struct kvm_vcpu *vcpu, unsigned long value);
+ void (*cache_gprs)(struct kvm_vcpu *vcpu);
+ void (*flush_gprs)(struct kvm_vcpu *vcpu);
void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a1c57d1eb460..22e956f01ddc 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9385,6 +9385,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
static void __get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
+ if (kvm_x86_ops.cache_gprs)
+ kvm_x86_ops.cache_gprs(vcpu);
+
if (vcpu->arch.emulate_regs_need_sync_to_vcpu) {
/*
* We are here if userspace calls get_regs() in the middle of
@@ -9459,6 +9462,9 @@ static void __set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
vcpu->arch.exception.pending = false;
+ if (kvm_x86_ops.flush_gprs)
+ kvm_x86_ops.flush_gprs(vcpu);
+
kvm_make_request(KVM_REQ_EVENT, vcpu);
}
--
2.17.1
Powered by blists - more mailing lists