From: Joerg Roedel <joro@8bytes.org>
To: x86@kernel.org
Cc: Eric Biederman <ebiederm@xmission.com>,
kexec@lists.infradead.org, Joerg Roedel <jroedel@suse.de>,
hpa@zytor.com, Andy Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Jiri Slaby <jslaby@suse.cz>,
Dan Williams <dan.j.williams@intel.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Juergen Gross <jgross@suse.com>,
Kees Cook <keescook@chromium.org>,
David Rientjes <rientjes@google.com>,
Cfir Cohen <cfir@google.com>, Erdem Aktas <erdemaktas@google.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Mike Stunes <mstunes@vmware.com>,
Sean Christopherson <seanjc@google.com>,
Martin Radev <martin.b.radev@gmail.com>,
Arvind Sankar <nivedita@alum.mit.edu>,
Joerg Roedel <joro@8bytes.org>,
linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, virtualization@lists.linux-foundation.org
Subject: [PATCH v2 11/12] x86/sev: Handle CLFLUSH MMIO events
Date: Mon, 13 Sep 2021 17:56:02 +0200 [thread overview]
Message-ID: <20210913155603.28383-12-joro@8bytes.org> (raw)
In-Reply-To: <20210913155603.28383-1-joro@8bytes.org>
From: Joerg Roedel <jroedel@suse.de>
Handle CLFLUSH instruction to MMIO memory in the #VC handler. The
instruction is ignored by the handler, as the Hypervisor is
responsible for cache management of emulated MMIO memory.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
arch/x86/kernel/sev-shared.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c
index a7a0793c4f98..682fa202444f 100644
--- a/arch/x86/kernel/sev-shared.c
+++ b/arch/x86/kernel/sev-shared.c
@@ -632,6 +632,15 @@ static enum es_result vc_handle_mmio_twobyte_ops(struct ghcb *ghcb,
long *reg_data;
switch (insn->opcode.bytes[1]) {
+ /* CLFLUSH */
+ case 0xae:
+ /*
+ * Ignore CLFLUSHes - those go to emulated MMIO anyway and the
+ * hypervisor is responsible for cache management.
+ */
+ ret = ES_OK;
+ break;
+
/* MMIO Read w/ zero-extension */
case 0xb6:
bytes = 1;
--
2.33.0
next prev parent reply other threads:[~2021-09-13 15:56 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-13 15:55 [PATCH v2 00/12] x86/sev: KEXEC/KDUMP support for SEV-ES guests Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 01/12] kexec: Allow architecture code to opt-out at runtime Joerg Roedel
2021-11-01 16:10 ` Borislav Petkov
2021-11-01 21:11 ` Eric W. Biederman
2021-11-02 16:37 ` Joerg Roedel
2021-11-02 17:00 ` Joerg Roedel
2021-11-02 18:17 ` Eric W. Biederman
2021-11-02 17:17 ` Borislav Petkov
2021-09-13 15:55 ` [PATCH v2 02/12] x86/kexec/64: Forbid kexec when running as an SEV-ES guest Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 03/12] x86/sev: Save and print negotiated GHCB protocol version Joerg Roedel
2021-11-03 14:27 ` Borislav Petkov
2022-01-26 9:27 ` Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 04/12] x86/sev: Do not hardcode " Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 05/12] x86/sev: Use GHCB protocol version 2 if supported Joerg Roedel
2021-11-03 16:05 ` Borislav Petkov
2021-09-13 15:55 ` [PATCH v2 06/12] x86/sev: Cache AP Jump Table Address Joerg Roedel
2021-11-08 18:14 ` Borislav Petkov
2021-09-13 15:55 ` [PATCH v2 07/12] x86/sev: Setup code to park APs in the AP Jump Table Joerg Roedel
2021-11-10 16:37 ` Borislav Petkov
2022-01-26 14:26 ` Joerg Roedel
2021-09-13 15:55 ` [PATCH v2 08/12] x86/sev: Park APs on AP Jump Table with GHCB protocol version 2 Joerg Roedel
2021-11-12 16:33 ` Borislav Petkov
2022-01-27 9:01 ` Joerg Roedel
2021-09-13 15:56 ` [PATCH v2 09/12] x86/sev: Use AP Jump Table blob to stop CPU Joerg Roedel
2021-11-15 18:44 ` Borislav Petkov
2021-09-13 15:56 ` [PATCH v2 10/12] x86/sev: Add MMIO handling support to boot/compressed/ code Joerg Roedel
2021-09-13 15:56 ` Joerg Roedel [this message]
2021-09-13 15:56 ` [PATCH v2 12/12] x86/sev: Support kexec under SEV-ES with AP Jump Table blob Joerg Roedel
2021-09-13 16:02 ` [PATCH v2 00/12] x86/sev: KEXEC/KDUMP support for SEV-ES guests Dave Hansen
2021-09-13 16:14 ` Joerg Roedel
2021-09-13 16:21 ` Dave Hansen
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