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From: Joerg Roedel <joro@8bytes.org>
To: x86@kernel.org
Cc: Joerg Roedel <joro@8bytes.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>,
	linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org, virtualization@lists.linux-foundation.org
Subject: [RFC PATCH 11/12] x86/sev: Handle CLFLUSH MMIO events
Date: Mon,  5 Jul 2021 10:24:42 +0200	[thread overview]
Message-ID: <20210705082443.14721-12-joro@8bytes.org> (raw)
In-Reply-To: <20210705082443.14721-1-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;
-- 
2.31.1


  parent reply	other threads:[~2021-07-05  8:28 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-05  8:24 [RFC PATCH 00/12] x86/sev: KEXEC/KDUMP support for SEV-ES guests Joerg Roedel
2021-07-05  8:24 ` [RFC PATCH 01/12] kexec: Allow architecture code to opt-out at runtime Joerg Roedel
2021-07-05  8:24 ` [RFC PATCH 02/12] x86/kexec/64: Forbid kexec when running as an SEV-ES guest Joerg Roedel
2021-07-05  8:24 ` [RFC PATCH 03/12] x86/sev: Save and print negotiated GHCB protocol version Joerg Roedel
2021-07-05  8:24 ` [RFC PATCH 04/12] x86/sev: Do not hardcode " Joerg Roedel
2021-07-05  8:24 ` [RFC PATCH 05/12] x86/sev: Use GHCB protocol version 2 if supported Joerg Roedel
2021-07-05  8:24 ` [RFC PATCH 06/12] x86/sev: Cache AP Jump Table Address Joerg Roedel
2021-07-05  8:24 ` [RFC PATCH 07/12] x86/sev: Setup code to park APs in the AP Jump Table Joerg Roedel
2021-07-05  8:24 ` [RFC PATCH 08/12] x86/sev: Park APs on AP Jump Table with GHCB protocol version 2 Joerg Roedel
2021-07-05  8:24 ` [RFC PATCH 09/12] x86/sev: Use AP Jump Table blob to stop CPU Joerg Roedel
2021-07-05  8:24 ` [RFC PATCH 10/12] x86/sev: Add MMIO handling support to boot/compressed/ code Joerg Roedel
2021-07-05  8:24 ` Joerg Roedel [this message]
2021-07-05  8:24 ` [RFC PATCH 12/12] x86/sev: Support kexec under SEV-ES with AP Jump Table blob Joerg Roedel

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