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Wed, 19 Apr 2023 15:18:55 -0700 (PDT) From: Atish Patra To: linux-kernel@vger.kernel.org Cc: Rajnesh Kanwal , Atish Patra , Alexandre Ghiti , Andrew Jones , Andrew Morton , Anup Patel , Atish Patra , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , Suzuki K Poulose , Will Deacon , Marc Zyngier , Sean Christopherson , linux-coco@lists.linux.dev, Dylan Reid , abrestic@rivosinc.com, Samuel Ortiz , Christoph Hellwig , Conor Dooley , Greg Kroah-Hartman , Guo Ren , Heiko Stuebner , Jiri Slaby , kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, Mayuresh Chitale , Palmer Dabbelt , Paolo Bonzini , Paul Walmsley , Uladzislau Rezki Subject: [RFC 39/48] RISC-V: Implement COVG SBI extension Date: Wed, 19 Apr 2023 15:17:07 -0700 Message-Id: <20230419221716.3603068-40-atishp@rivosinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230419221716.3603068-1-atishp@rivosinc.com> References: <20230419221716.3603068-1-atishp@rivosinc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 373AB40015 X-Stat-Signature: cquqmjc3ts3e5wsyrxj5sqxkt7wgu3zb X-HE-Tag: 1681942736-916284 X-HE-Meta: U2FsdGVkX18VZ/cjd2XfTArfn0FSpPDS9QdMDA7L9RfstXk2T/SJbQPDs0s6OHqFerzL7ET8L9qfixPp4tzG3cbr6F/vRvUvl3glPViF/I/WGhnjKcYnueU65G+/b1SV21a/NZOzqqDFvXAHvFPbb85MpzLUB8wVZj9pspNVwuRICRFGYDqna+uonZDOXJ5vKX1oOdwco2fP0C5VsG5g5hFF621zXkgZkPzGfAqY9n3HiQ2E7RNrKWXo13yVaMQZhjL/h/hIvMXRBFnP4bm+eG0m6E4jTCSxTTici7ZwA2E2JqMg5emNMOy5O7laPJyzDEyyKYIa6Wgo/rtzm+XkEYAMFK5sN6VVe6GmXHQ5PdxHN5oFVGMitrxtEWyz8zr4Kb8ycQJN/MZdlVNioqbw7WrjJpJ4Zemij6JPqmllatkD+ZBbL5T6FJrl/OIAnFNYUtZbQBZCo5lNUfRvHGW16fI8f1NlYSwPRCHLRmihhf7nYvdUS2zPso9cGAgaYZjgNQL5D32IMiIpXDrPNYU9H7z9uAP9cGev8bV2qa6N4VaJK9BBHOBuwQriYXHUpwu3eFQ4FYrASir77G/OHTo8xyygaYt/3p8xYxw3Q3GKmlvaP+l8EZtjdZdQc3D6V2S9JuQA4VZcSikQPxr4eWnt9Id75EHgMcSHLR7/XoPWzLgqoKOTJOsMhTQPXp0aX4GJxtOiKxXmyzJ2fourqvrd5fCieabjXxUhZEIdPlNBMfGZ6V4aRjMsAQHQanDx9Gm8W+lzaU2J+/H6k5K1/Gxw9yGDNQ7jk5uucxw1M+ecM+KvFLX3n9iiZ2s6gRugv+cDdKMRktvQgvKJoPQYI6P57oRsq0+LyrtxUMindrLqp5AOa0FV8Yv9/ehAo0gl9HemyysDXMui+lRwyudjh9+kdVd2corwFALLySKdOnuv1YRT/9RFPeAsb20gn8PvBnbkLSz6WqRm6orkRJCTDfL 2JSUGxPB 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Rajnesh Kanwal COVG extension defines the guest side interface for running a guest in CoVE. These functions allow a CoVE guest to share/unshare memory, ask host to trap and emulate MMIO regions and allow/deny injection of interrupts from host. Signed-off-by: Rajnesh Kanwal Signed-off-by: Atish Patra --- arch/riscv/cove/Makefile | 2 +- arch/riscv/cove/cove_guest_sbi.c | 109 ++++++++++++++++++++++++++++++ arch/riscv/include/asm/covg_sbi.h | 38 +++++++++++ 3 files changed, 148 insertions(+), 1 deletion(-) create mode 100644 arch/riscv/cove/cove_guest_sbi.c create mode 100644 arch/riscv/include/asm/covg_sbi.h diff --git a/arch/riscv/cove/Makefile b/arch/riscv/cove/Makefile index 03a0cac..a95043b 100644 --- a/arch/riscv/cove/Makefile +++ b/arch/riscv/cove/Makefile @@ -1,2 +1,2 @@ # SPDX-License-Identifier: GPL-2.0 -obj-$(CONFIG_RISCV_COVE_GUEST) += core.o +obj-$(CONFIG_RISCV_COVE_GUEST) += core.o cove_guest_sbi.o diff --git a/arch/riscv/cove/cove_guest_sbi.c b/arch/riscv/cove/cove_guest_sbi.c new file mode 100644 index 0000000..af22d5e --- /dev/null +++ b/arch/riscv/cove/cove_guest_sbi.c @@ -0,0 +1,109 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * COVG SBI extensions related helper functions. + * + * Copyright (c) 2023 Rivos Inc. + * + * Authors: + * Rajnesh Kanwal + */ + +#include +#include +#include + +int sbi_covg_add_mmio_region(unsigned long addr, unsigned long len) +{ + struct sbiret ret; + + ret = sbi_ecall(SBI_EXT_COVG, SBI_EXT_COVG_ADD_MMIO_REGION, addr, len, + 0, 0, 0, 0); + if (ret.error) + return sbi_err_map_linux_errno(ret.error); + + return 0; +} + +int sbi_covg_remove_mmio_region(unsigned long addr, unsigned long len) +{ + struct sbiret ret; + + ret = sbi_ecall(SBI_EXT_COVG, SBI_EXT_COVG_REMOVE_MMIO_REGION, addr, + len, 0, 0, 0, 0); + if (ret.error) + return sbi_err_map_linux_errno(ret.error); + + return 0; +} + +int sbi_covg_share_memory(unsigned long addr, unsigned long len) +{ + struct sbiret ret; + + ret = sbi_ecall(SBI_EXT_COVG, SBI_EXT_COVG_SHARE_MEMORY, addr, len, 0, + 0, 0, 0); + if (ret.error) + return sbi_err_map_linux_errno(ret.error); + + return 0; +} + +int sbi_covg_unshare_memory(unsigned long addr, unsigned long len) +{ + struct sbiret ret; + + ret = sbi_ecall(SBI_EXT_COVG, SBI_EXT_COVG_UNSHARE_MEMORY, addr, len, 0, + 0, 0, 0); + if (ret.error) + return sbi_err_map_linux_errno(ret.error); + + return 0; +} + +int sbi_covg_allow_external_interrupt(unsigned long id) +{ + struct sbiret ret; + + ret = sbi_ecall(SBI_EXT_COVG, SBI_EXT_COVG_ALLOW_EXT_INTERRUPT, id, 0, + 0, 0, 0, 0); + if (ret.error) + return sbi_err_map_linux_errno(ret.error); + + return 0; +} + +int sbi_covg_allow_all_external_interrupt(void) +{ + struct sbiret ret; + + ret = sbi_ecall(SBI_EXT_COVG, SBI_EXT_COVG_ALLOW_EXT_INTERRUPT, -1, 0, + 0, 0, 0, 0); + if (ret.error) + return sbi_err_map_linux_errno(ret.error); + + return 0; +} + +int sbi_covg_deny_external_interrupt(unsigned long id) +{ + struct sbiret ret; + + ret = sbi_ecall(SBI_EXT_COVG, SBI_EXT_COVG_DENY_EXT_INTERRUPT, id, 0, 0, + 0, 0, 0); + if (ret.error) + return sbi_err_map_linux_errno(ret.error); + + return 0; +} + +int sbi_covg_deny_all_external_interrupt(void) +{ + struct sbiret ret; + + ret = sbi_ecall(SBI_EXT_COVG, SBI_EXT_COVG_DENY_EXT_INTERRUPT, -1, 0, 0, + 0, 0, 0); + if (ret.error) + return sbi_err_map_linux_errno(ret.error); + + return 0; +} diff --git a/arch/riscv/include/asm/covg_sbi.h b/arch/riscv/include/asm/covg_sbi.h new file mode 100644 index 0000000..31283de --- /dev/null +++ b/arch/riscv/include/asm/covg_sbi.h @@ -0,0 +1,38 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * COVG SBI extension related header file. + * + * Copyright (c) 2023 Rivos Inc. + * + * Authors: + * Rajnesh Kanwal + */ + +#ifndef __RISCV_COVG_SBI_H__ +#define __RISCV_COVG_SBI_H__ + +#ifdef CONFIG_RISCV_COVE_GUEST + +int sbi_covg_add_mmio_region(unsigned long addr, unsigned long len); +int sbi_covg_remove_mmio_region(unsigned long addr, unsigned long len); +int sbi_covg_share_memory(unsigned long addr, unsigned long len); +int sbi_covg_unshare_memory(unsigned long addr, unsigned long len); +int sbi_covg_allow_external_interrupt(unsigned long id); +int sbi_covg_allow_all_external_interrupt(void); +int sbi_covg_deny_external_interrupt(unsigned long id); +int sbi_covg_deny_all_external_interrupt(void); + +#else + +static inline int sbi_covg_add_mmio_region(unsigned long addr, unsigned long len) { return 0; } +static inline int sbi_covg_remove_mmio_region(unsigned long addr, unsigned long len) { return 0; } +static inline int sbi_covg_share_memory(unsigned long addr, unsigned long len) { return 0; } +static inline int sbi_covg_unshare_memory(unsigned long addr, unsigned long len) { return 0; } +static inline int sbi_covg_allow_external_interrupt(unsigned long id) { return 0; } +static inline int sbi_covg_allow_all_external_interrupt(void) { return 0; } +static inline int sbi_covg_deny_external_interrupt(unsigned long id) { return 0; } +static inline int sbi_covg_deny_all_external_interrupt(void) { return 0; } + +#endif + +#endif /* __RISCV_COVG_SBI_H__ */ -- 2.25.1