From: Joerg Roedel <joro@8bytes.org> To: x86@kernel.org, Eric Biederman <ebiederm@xmission.com> Cc: 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 11/12] x86/sev: Handle CLFLUSH MMIO events Date: Wed, 21 Jul 2021 16:20:14 +0200 [thread overview] Message-ID: <20210721142015.1401-12-joro@8bytes.org> (raw) In-Reply-To: <20210721142015.1401-1-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
WARNING: multiple messages have this Message-ID (diff)
From: Joerg Roedel <joro@8bytes.org> To: x86@kernel.org, Eric Biederman <ebiederm@xmission.com> Cc: kvm@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>, Dave Hansen <dave.hansen@linux.intel.com>, virtualization@lists.linux-foundation.org, Arvind Sankar <nivedita@alum.mit.edu>, hpa@zytor.com, Jiri Slaby <jslaby@suse.cz>, Joerg Roedel <joro@8bytes.org>, David Rientjes <rientjes@google.com>, Martin Radev <martin.b.radev@gmail.com>, Tom Lendacky <thomas.lendacky@amd.com>, Joerg Roedel <jroedel@suse.de>, Kees Cook <keescook@chromium.org>, Cfir Cohen <cfir@google.com>, linux-coco@lists.linux.dev, Andy Lutomirski <luto@kernel.org>, Dan Williams <dan.j.williams@intel.com>, Juergen Gross <jgross@suse.com>, Mike Stunes <mstunes@vmware.com>, Sean Christopherson <seanjc@google.com>, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Masami Hiramatsu <mhiramat@kernel.org>, Erdem Aktas <erdemaktas@google.com> Subject: [PATCH 11/12] x86/sev: Handle CLFLUSH MMIO events Date: Wed, 21 Jul 2021 16:20:14 +0200 [thread overview] Message-ID: <20210721142015.1401-12-joro@8bytes.org> (raw) In-Reply-To: <20210721142015.1401-1-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 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next prev parent reply other threads:[~2021-07-21 14:20 UTC|newest] Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-21 14:20 [PATCH 00/12] x86/sev: KEXEC/KDUMP support for SEV-ES guests Joerg Roedel 2021-07-21 14:20 ` Joerg Roedel 2021-07-21 14:20 ` [PATCH 01/12] kexec: Allow architecture code to opt-out at runtime Joerg Roedel 2021-07-21 14:20 ` Joerg Roedel 2022-04-21 13:20 ` Tao Liu 2022-04-21 13:20 ` Tao Liu 2021-07-21 14:20 ` [PATCH 02/12] x86/kexec/64: Forbid kexec when running as an SEV-ES guest Joerg Roedel 2021-07-21 14:20 ` Joerg Roedel 2021-07-21 14:20 ` [PATCH 03/12] x86/sev: Save and print negotiated GHCB protocol version Joerg Roedel 2021-07-21 14:20 ` Joerg Roedel 2021-07-21 14:20 ` [PATCH 04/12] x86/sev: Do not hardcode " Joerg Roedel 2021-07-21 14:20 ` Joerg Roedel 2021-07-21 21:17 ` Tom Lendacky 2021-07-21 21:17 ` Tom Lendacky 2021-07-21 21:17 ` Tom Lendacky via Virtualization 2021-07-31 7:18 ` Joerg Roedel 2021-07-31 7:18 ` Joerg Roedel 2021-07-31 7:18 ` Joerg Roedel 2021-07-21 14:20 ` [PATCH 05/12] x86/sev: Use GHCB protocol version 2 if supported Joerg Roedel 2021-07-21 14:20 ` Joerg Roedel 2021-07-21 14:20 ` [PATCH 06/12] x86/sev: Cache AP Jump Table Address Joerg Roedel 2021-07-21 14:20 ` Joerg Roedel 2021-07-21 14:20 ` [PATCH 07/12] x86/sev: Setup code to park APs in the AP Jump Table Joerg Roedel 2021-07-21 14:20 ` Joerg Roedel 2021-07-21 14:20 ` [PATCH 08/12] x86/sev: Park APs on AP Jump Table with GHCB protocol version 2 Joerg Roedel 2021-07-21 14:20 ` Joerg Roedel 2021-07-21 14:20 ` [PATCH 09/12] x86/sev: Use AP Jump Table blob to stop CPU Joerg Roedel 2021-07-21 14:20 ` Joerg Roedel 2021-07-21 14:20 ` [PATCH 10/12] x86/sev: Add MMIO handling support to boot/compressed/ code Joerg Roedel 2021-07-21 14:20 ` Joerg Roedel 2021-07-21 14:20 ` Joerg Roedel [this message] 2021-07-21 14:20 ` [PATCH 11/12] x86/sev: Handle CLFLUSH MMIO events Joerg Roedel 2021-07-30 22:42 ` Sean Christopherson 2021-07-30 22:42 ` Sean Christopherson 2021-07-31 7:17 ` Joerg Roedel 2021-07-31 7:17 ` Joerg Roedel 2021-07-31 7:17 ` Joerg Roedel 2021-07-21 14:20 ` [PATCH 12/12] x86/sev: Support kexec under SEV-ES with AP Jump Table blob Joerg Roedel 2021-07-21 14:20 ` Joerg Roedel
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