diff options
Diffstat (limited to 'system/xen/xsa/xsa263-4.10-0001-x86-spec_ctrl-Read-MSR_ARCH_CAPABILITIES-only-once.patch')
-rw-r--r-- | system/xen/xsa/xsa263-4.10-0001-x86-spec_ctrl-Read-MSR_ARCH_CAPABILITIES-only-once.patch | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/system/xen/xsa/xsa263-4.10-0001-x86-spec_ctrl-Read-MSR_ARCH_CAPABILITIES-only-once.patch b/system/xen/xsa/xsa263-4.10-0001-x86-spec_ctrl-Read-MSR_ARCH_CAPABILITIES-only-once.patch deleted file mode 100644 index c26afebc20..0000000000 --- a/system/xen/xsa/xsa263-4.10-0001-x86-spec_ctrl-Read-MSR_ARCH_CAPABILITIES-only-once.patch +++ /dev/null @@ -1,110 +0,0 @@ -From 13fafdf5c97d3bc2a8851c4d1796feac0f82d498 Mon Sep 17 00:00:00 2001 -From: Andrew Cooper <andrew.cooper3@citrix.com> -Date: Thu, 26 Apr 2018 12:21:00 +0100 -Subject: [PATCH] x86/spec_ctrl: Read MSR_ARCH_CAPABILITIES only once - -Make it available from the beginning of init_speculation_mitigations(), and -pass it into appropriate functions. Fix an RSBA typo while moving the -affected comment. - -Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> -Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> -Reviewed-by: Wei Liu <wei.liu2@citrix.com> -Reviewed-by: Jan Beulich <jbeulich@suse.com> -Release-acked-by: Juergen Gross <jgross@suse.com> -(cherry picked from commit d6c65187252a6c1810fd24c4d46f812840de8d3c) ---- - xen/arch/x86/spec_ctrl.c | 34 ++++++++++++++-------------------- - 1 file changed, 14 insertions(+), 20 deletions(-) - -diff --git a/xen/arch/x86/spec_ctrl.c b/xen/arch/x86/spec_ctrl.c -index fa67a0f..dc90743 100644 ---- a/xen/arch/x86/spec_ctrl.c -+++ b/xen/arch/x86/spec_ctrl.c -@@ -81,18 +81,15 @@ static int __init parse_bti(const char *s) - } - custom_param("bti", parse_bti); - --static void __init print_details(enum ind_thunk thunk) -+static void __init print_details(enum ind_thunk thunk, uint64_t caps) - { - unsigned int _7d0 = 0, e8b = 0, tmp; -- uint64_t caps = 0; - - /* Collect diagnostics about available mitigations. */ - if ( boot_cpu_data.cpuid_level >= 7 ) - cpuid_count(7, 0, &tmp, &tmp, &tmp, &_7d0); - if ( boot_cpu_data.extended_cpuid_level >= 0x80000008 ) - cpuid(0x80000008, &tmp, &e8b, &tmp, &tmp); -- if ( _7d0 & cpufeat_mask(X86_FEATURE_ARCH_CAPS) ) -- rdmsrl(MSR_ARCH_CAPABILITIES, caps); - - printk(XENLOG_DEBUG "Speculative mitigation facilities:\n"); - -@@ -125,7 +122,7 @@ static void __init print_details(enum ind_thunk thunk) - } - - /* Calculate whether Retpoline is known-safe on this CPU. */ --static bool __init retpoline_safe(void) -+static bool __init retpoline_safe(uint64_t caps) - { - unsigned int ucode_rev = this_cpu(ucode_cpu_info).cpu_sig.rev; - -@@ -136,19 +133,12 @@ static bool __init retpoline_safe(void) - boot_cpu_data.x86 != 6 ) - return false; - -- if ( boot_cpu_has(X86_FEATURE_ARCH_CAPS) ) -- { -- uint64_t caps; -- -- rdmsrl(MSR_ARCH_CAPABILITIES, caps); -- -- /* -- * RBSA may be set by a hypervisor to indicate that we may move to a -- * processor which isn't retpoline-safe. -- */ -- if ( caps & ARCH_CAPS_RSBA ) -- return false; -- } -+ /* -+ * RSBA may be set by a hypervisor to indicate that we may move to a -+ * processor which isn't retpoline-safe. -+ */ -+ if ( caps & ARCH_CAPS_RSBA ) -+ return false; - - switch ( boot_cpu_data.x86_model ) - { -@@ -218,6 +208,10 @@ void __init init_speculation_mitigations(void) - { - enum ind_thunk thunk = THUNK_DEFAULT; - bool ibrs = false; -+ uint64_t caps = 0; -+ -+ if ( boot_cpu_has(X86_FEATURE_ARCH_CAPS) ) -+ rdmsrl(MSR_ARCH_CAPABILITIES, caps); - - /* - * Has the user specified any custom BTI mitigations? If so, follow their -@@ -246,7 +240,7 @@ void __init init_speculation_mitigations(void) - * On Intel hardware, we'd like to use retpoline in preference to - * IBRS, but only if it is safe on this hardware. - */ -- else if ( retpoline_safe() ) -+ else if ( retpoline_safe(caps) ) - thunk = THUNK_RETPOLINE; - else if ( boot_cpu_has(X86_FEATURE_IBRSB) ) - ibrs = true; -@@ -331,7 +325,7 @@ void __init init_speculation_mitigations(void) - /* (Re)init BSP state now that default_bti_ist_info has been calculated. */ - init_shadow_spec_ctrl_state(); - -- print_details(thunk); -+ print_details(thunk, caps); - } - - static void __init __maybe_unused build_assertions(void) --- -2.1.4 - |