linux-kernel - [PATCH RFC v4 3/3] riscv: KVM: Add Svukte extension support for Guest/VM

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20241213-dev-maxh-svukte-v4-v4-3-92762c67f743@sifive.com>
Date: Fri, 13 Dec 2024 19:33:09 +0800
From: Max Hsu <max.hsu@...ive.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Anup Patel <anup@...infault.org>, Atish Patra <atishp@...shpatra.org>
Cc: Palmer Dabbelt <palmer@...ive.com>, Conor Dooley <conor@...nel.org>, 
 devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, kvm@...r.kernel.org, 
 kvm-riscv@...ts.infradead.org, Max Hsu <max.hsu@...ive.com>, 
 Samuel Holland <samuel.holland@...ive.com>
Subject: [PATCH RFC v4 3/3] riscv: KVM: Add Svukte extension support for
 Guest/VM

Add KVM_RISCV_ISA_EXT_SVUKTE for VMM to detect the enablement
for the Svukte extension on Guest/VM.

Since the Guest OS may utilize the Svukte extension simply by setting
the senvcfg.UKTE without any trap to host. In the view of VMM, the
Svukte extension should be always presented. Therefore adding an
extra entry kvm_riscv_vcpu_isa_disable_allowed().

Reviewed-by: Samuel Holland <samuel.holland@...ive.com>
Signed-off-by: Max Hsu <max.hsu@...ive.com>
---
 arch/riscv/include/uapi/asm/kvm.h | 1 +
 arch/riscv/kvm/vcpu_onereg.c      | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index 3482c9a73d1b644385182436192914f34b50b997..57b3abfbbabd967721f140b65f58f002e770eb6a 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -179,6 +179,7 @@ enum KVM_RISCV_ISA_EXT_ID {
 	KVM_RISCV_ISA_EXT_SSNPM,
 	KVM_RISCV_ISA_EXT_SVADE,
 	KVM_RISCV_ISA_EXT_SVADU,
+	KVM_RISCV_ISA_EXT_SVUKTE,
 	KVM_RISCV_ISA_EXT_MAX,
 };
 
diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
index 753f66c8b70a72e76210075b4e07849741f614d4..50fbbe5bade6af83977bac6d381688fea80e7945 100644
--- a/arch/riscv/kvm/vcpu_onereg.c
+++ b/arch/riscv/kvm/vcpu_onereg.c
@@ -46,6 +46,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	KVM_ISA_EXT_ARR(SVINVAL),
 	KVM_ISA_EXT_ARR(SVNAPOT),
 	KVM_ISA_EXT_ARR(SVPBMT),
+	KVM_ISA_EXT_ARR(SVUKTE),
 	KVM_ISA_EXT_ARR(ZACAS),
 	KVM_ISA_EXT_ARR(ZAWRS),
 	KVM_ISA_EXT_ARR(ZBA),
@@ -145,6 +146,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
 	case KVM_RISCV_ISA_EXT_SSTC:
 	case KVM_RISCV_ISA_EXT_SVINVAL:
 	case KVM_RISCV_ISA_EXT_SVNAPOT:
+	case KVM_RISCV_ISA_EXT_SVUKTE:
 	case KVM_RISCV_ISA_EXT_ZACAS:
 	case KVM_RISCV_ISA_EXT_ZAWRS:
 	case KVM_RISCV_ISA_EXT_ZBA:

-- 
2.43.2