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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,
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        Peter Zijlstra <peterz@infradead.org>,
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        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,
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Subject: [PATCH v2 11/12] x86/sev: Handle CLFLUSH MMIO events
Date:   Mon, 13 Sep 2021 17:56:02 +0200
Message-Id: <20210913155603.28383-12-joro@8bytes.org>
In-Reply-To: <20210913155603.28383-1-joro@8bytes.org>
References: <20210913155603.28383-1-joro@8bytes.org>
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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