From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
Arnd Bergmann <arnd@arndb.de>
Cc: Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-hyperv@vger.kernel.org,
linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
Ajay Garg <ajaygargnsit@gmail.com>
Subject: [PATCH v2 4/8] KVM: x86: Add a helper to get the sparse VP_SET for IPIs and TLB flushes
Date: Fri, 29 Oct 2021 17:07:56 -0700 [thread overview]
Message-ID: <20211030000800.3065132-5-seanjc@google.com> (raw)
In-Reply-To: <20211030000800.3065132-1-seanjc@google.com>
Add a helper, kvm_get_sparse_vp_set(), to handle sanity checks related to
the VARHEAD field and reading the sparse banks of a VP_SET. A future
commit to reduce the memory footprint of sparse_banks will introduce more
common code to the sparse bank retrieval.
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/hyperv.c | 32 ++++++++++++++++----------------
1 file changed, 16 insertions(+), 16 deletions(-)
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index e68931ed27f6..3d0981163eed 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1750,10 +1750,19 @@ struct kvm_hv_hcall {
sse128_t xmm[HV_HYPERCALL_MAX_XMM_REGISTERS];
};
+static u64 kvm_get_sparse_vp_set(struct kvm *kvm, struct kvm_hv_hcall *hc,
+ u64 *sparse_banks, gpa_t offset)
+{
+ if (hc->var_cnt > 64)
+ return -EINVAL;
+
+ return kvm_read_guest(kvm, hc->ingpa + offset, sparse_banks,
+ hc->var_cnt * sizeof(*sparse_banks));
+}
+
static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc, bool ex)
{
int i;
- gpa_t gpa;
struct kvm *kvm = vcpu->kvm;
struct hv_tlb_flush_ex flush_ex;
struct hv_tlb_flush flush;
@@ -1830,13 +1839,9 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc, bool
goto do_flush;
}
- if (hc->var_cnt > 64)
- return HV_STATUS_INVALID_HYPERCALL_INPUT;
-
- gpa = hc->ingpa + offsetof(struct hv_tlb_flush_ex,
- hv_vp_set.bank_contents);
- if (unlikely(kvm_read_guest(kvm, gpa, sparse_banks,
- hc->var_cnt * sizeof(sparse_banks[0]))))
+ if (kvm_get_sparse_vp_set(kvm, hc, sparse_banks,
+ offsetof(struct hv_tlb_flush_ex,
+ hv_vp_set.bank_contents)))
return HV_STATUS_INVALID_HYPERCALL_INPUT;
}
@@ -1933,14 +1938,9 @@ static u64 kvm_hv_send_ipi(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc, bool
if (!hc->var_cnt)
goto ret_success;
- if (hc->var_cnt > 64)
- return HV_STATUS_INVALID_HYPERCALL_INPUT;
-
- if (kvm_read_guest(kvm,
- hc->ingpa + offsetof(struct hv_send_ipi_ex,
- vp_set.bank_contents),
- sparse_banks,
- hc->var_cnt * sizeof(sparse_banks[0])))
+ if (kvm_get_sparse_vp_set(kvm, hc, sparse_banks,
+ offsetof(struct hv_send_ipi_ex,
+ vp_set.bank_contents)))
return HV_STATUS_INVALID_HYPERCALL_INPUT;
}
--
2.33.1.1089.g2158813163f-goog
next prev parent reply other threads:[~2021-10-30 0:08 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-30 0:07 [PATCH v2 0/8] KVM: x86: Hyper-V hypercall fix and cleanups Sean Christopherson
2021-10-30 0:07 ` [PATCH v2 1/8] KVM: x86: Ignore sparse banks size for an "all CPUs", non-sparse IPI req Sean Christopherson
2021-11-01 9:05 ` Vitaly Kuznetsov
2021-10-30 0:07 ` [PATCH v2 2/8] KVM: x86: Get the number of Hyper-V sparse banks from the VARHEAD field Sean Christopherson
2021-11-01 9:52 ` Vitaly Kuznetsov
2021-10-30 0:07 ` [PATCH v2 3/8] KVM: x86: Refactor kvm_hv_flush_tlb() to reduce indentation Sean Christopherson
2021-11-01 10:00 ` Vitaly Kuznetsov
2021-12-03 23:45 ` Sean Christopherson
2021-10-30 0:07 ` Sean Christopherson [this message]
2021-11-01 10:06 ` [PATCH v2 4/8] KVM: x86: Add a helper to get the sparse VP_SET for IPIs and TLB flushes Vitaly Kuznetsov
2021-10-30 0:07 ` [PATCH v2 5/8] KVM: x86: Don't bother reading sparse banks that end up being ignored Sean Christopherson
2021-11-01 9:46 ` Vitaly Kuznetsov
2021-10-30 0:07 ` [PATCH v2 6/8] KVM: x86: Shove vp_bitmap handling down into sparse_set_to_vcpu_mask() Sean Christopherson
2021-11-01 10:12 ` Vitaly Kuznetsov
2021-10-30 0:07 ` [PATCH v2 7/8] KVM: x86: Reject fixeds-size Hyper-V hypercalls with non-zero "var_cnt" Sean Christopherson
2021-11-01 10:27 ` Vitaly Kuznetsov
2021-12-03 23:48 ` Sean Christopherson
2021-10-30 0:08 ` [PATCH v2 8/8] KVM: x86: Add checks for reserved-to-zero Hyper-V hypercall fields Sean Christopherson
2021-11-01 10:33 ` Vitaly Kuznetsov
2021-12-02 2:13 ` Sean Christopherson
2021-12-02 15:16 ` Michael Kelley (LINUX)
2021-12-03 14:09 ` ** POTENTIAL FRAUD ALERT - RED HAT ** " Vitaly Kuznetsov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20211030000800.3065132-5-seanjc@google.com \
--to=seanjc@google.com \
--cc=ajaygargnsit@gmail.com \
--cc=arnd@arndb.de \
--cc=decui@microsoft.com \
--cc=haiyangz@microsoft.com \
--cc=jmattson@google.com \
--cc=joro@8bytes.org \
--cc=kvm@vger.kernel.org \
--cc=kys@microsoft.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-hyperv@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=pbonzini@redhat.com \
--cc=sthemmin@microsoft.com \
--cc=vkuznets@redhat.com \
--cc=wanpengli@tencent.com \
--cc=wei.liu@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).