This is a note to let you know that I've just added the patch titled
KVM: x86/mmu: Avoid indirect call for get_cr3
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-x86-mmu-avoid-indirect-call-for-get_cr3.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 486a413cb7ee0c99d3a559cbad97cae281706ad9
Author: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Fri May 12 15:20:20 2023 +0200
KVM: x86/mmu: Avoid indirect call for get_cr3
[ Upstream commit 2fdcc1b324189b5fb20655baebd40cd82e2bdf0c ]
Most of the time, calls to get_guest_pgd result in calling
kvm_read_cr3 (the exception is only nested TDP). Hardcode
the default instead of using the get_cr3 function, avoiding
a retpoline if they are enabled.
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230322013731.102955-2-minipli@xxxxxxxxxxxxxx
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx> # backport to v6.3.x
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index c8ebe542c565f..18c0deeaa2ec4 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -242,6 +242,20 @@ static struct kvm_mmu_role_regs vcpu_to_role_regs(struct kvm_vcpu *vcpu)
return regs;
}
+static unsigned long get_guest_cr3(struct kvm_vcpu *vcpu)
+{
+ return kvm_read_cr3(vcpu);
+}
+
+static inline unsigned long kvm_mmu_get_guest_pgd(struct kvm_vcpu *vcpu,
+ struct kvm_mmu *mmu)
+{
+ if (IS_ENABLED(CONFIG_RETPOLINE) && mmu->get_guest_pgd == get_guest_cr3)
+ return kvm_read_cr3(vcpu);
+
+ return mmu->get_guest_pgd(vcpu);
+}
+
static inline bool kvm_available_flush_tlb_with_range(void)
{
return kvm_x86_ops.tlb_remote_flush_with_range;
@@ -3731,7 +3745,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
int quadrant, i, r;
hpa_t root;
- root_pgd = mmu->get_guest_pgd(vcpu);
+ root_pgd = kvm_mmu_get_guest_pgd(vcpu, mmu);
root_gfn = root_pgd >> PAGE_SHIFT;
if (mmu_check_root(vcpu, root_gfn))
@@ -4181,7 +4195,7 @@ static bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
arch.token = alloc_apf_token(vcpu);
arch.gfn = gfn;
arch.direct_map = vcpu->arch.mmu->root_role.direct;
- arch.cr3 = vcpu->arch.mmu->get_guest_pgd(vcpu);
+ arch.cr3 = kvm_mmu_get_guest_pgd(vcpu, vcpu->arch.mmu);
return kvm_setup_async_pf(vcpu, cr2_or_gpa,
kvm_vcpu_gfn_to_hva(vcpu, gfn), &arch);
@@ -4200,7 +4214,7 @@ void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
return;
if (!vcpu->arch.mmu->root_role.direct &&
- work->arch.cr3 != vcpu->arch.mmu->get_guest_pgd(vcpu))
+ work->arch.cr3 != kvm_mmu_get_guest_pgd(vcpu, vcpu->arch.mmu))
return;
kvm_mmu_do_page_fault(vcpu, work->cr2_or_gpa, 0, true);
@@ -4604,11 +4618,6 @@ void kvm_mmu_new_pgd(struct kvm_vcpu *vcpu, gpa_t new_pgd)
}
EXPORT_SYMBOL_GPL(kvm_mmu_new_pgd);
-static unsigned long get_cr3(struct kvm_vcpu *vcpu)
-{
- return kvm_read_cr3(vcpu);
-}
-
static bool sync_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, gfn_t gfn,
unsigned int access)
{
@@ -5159,7 +5168,7 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu,
context->page_fault = kvm_tdp_page_fault;
context->sync_page = nonpaging_sync_page;
context->invlpg = NULL;
- context->get_guest_pgd = get_cr3;
+ context->get_guest_pgd = get_guest_cr3;
context->get_pdptr = kvm_pdptr_read;
context->inject_page_fault = kvm_inject_page_fault;
@@ -5309,7 +5318,7 @@ static void init_kvm_softmmu(struct kvm_vcpu *vcpu,
kvm_init_shadow_mmu(vcpu, cpu_role);
- context->get_guest_pgd = get_cr3;
+ context->get_guest_pgd = get_guest_cr3;
context->get_pdptr = kvm_pdptr_read;
context->inject_page_fault = kvm_inject_page_fault;
}
@@ -5323,7 +5332,7 @@ static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu,
return;
g_context->cpu_role.as_u64 = new_mode.as_u64;
- g_context->get_guest_pgd = get_cr3;
+ g_context->get_guest_pgd = get_guest_cr3;
g_context->get_pdptr = kvm_pdptr_read;
g_context->inject_page_fault = kvm_inject_page_fault;
diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index 57f0b75c80f9d..2ea2861bbb3c1 100644
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
@@ -324,7 +324,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker,
trace_kvm_mmu_pagetable_walk(addr, access);
retry_walk:
walker->level = mmu->cpu_role.base.level;
- pte = mmu->get_guest_pgd(vcpu);
+ pte = kvm_mmu_get_guest_pgd(vcpu, mmu);
have_ad = PT_HAVE_ACCESSED_DIRTY(mmu);
#if PTTYPE == 64
