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d="scan'208";a="16473605" From: Roger Pau Monne To: Subject: [PATCH] x86/hap: be more selective with assisted TLB flush Date: Wed, 29 Apr 2020 19:36:01 +0200 Message-ID: <20200429173601.77605-1-roger.pau@citrix.com> X-Mailer: git-send-email 2.26.0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Andrew Cooper , Wei Liu , George Dunlap , Jan Beulich , Roger Pau Monne Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) When doing an assisted flush on HAP the purpose of the on_selected_cpus is just to trigger a vmexit on remote CPUs that are in guest context, and hence just using is_vcpu_dirty_cpu is too lax, also check that the vCPU is running. While there also pass NULL as the data parameter of on_selected_cpus, the dummy handler doesn't consume the data in any way. Signed-off-by: Roger Pau Monn=C3=A9 Reviewed-by: Jan Beulich --- xen/arch/x86/mm/hap/hap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/xen/arch/x86/mm/hap/hap.c b/xen/arch/x86/mm/hap/hap.c index 580d1c2164..0275cdf5c8 100644 --- a/xen/arch/x86/mm/hap/hap.c +++ b/xen/arch/x86/mm/hap/hap.c @@ -719,7 +719,7 @@ static bool flush_tlb(bool (*flush_vcpu)(void *ctxt, st= ruct vcpu *v), hvm_asid_flush_vcpu(v); =20 cpu =3D read_atomic(&v->dirty_cpu); - if ( cpu !=3D this_cpu && is_vcpu_dirty_cpu(cpu) ) + if ( cpu !=3D this_cpu && is_vcpu_dirty_cpu(cpu) && v->is_running ) __cpumask_set_cpu(cpu, mask); } =20 @@ -729,7 +729,7 @@ static bool flush_tlb(bool (*flush_vcpu)(void *ctxt, st= ruct vcpu *v), * not currently running will already be flushed when scheduled becaus= e of * the ASID tickle done in the loop above. */ - on_selected_cpus(mask, dummy_flush, mask, 0); + on_selected_cpus(mask, dummy_flush, NULL, 0); =20 return true; } --=20 2.26.0