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-rw-r--r--arch/x86/boot/compressed/acpi.c2
-rw-r--r--arch/x86/include/asm/syscall_wrapper.h34
-rw-r--r--arch/x86/kvm/svm/sev.c19
-rw-r--r--arch/x86/kvm/svm/svm.c1
-rw-r--r--arch/x86/kvm/svm/svm.h2
-rw-r--r--arch/x86/xen/Kconfig1
6 files changed, 27 insertions, 32 deletions
diff --git a/arch/x86/boot/compressed/acpi.c b/arch/x86/boot/compressed/acpi.c
index 55c98fdd67d2..18d15d1ce87d 100644
--- a/arch/x86/boot/compressed/acpi.c
+++ b/arch/x86/boot/compressed/acpi.c
@@ -178,7 +178,7 @@ static unsigned long get_cmdline_acpi_rsdp(void)
{
unsigned long addr = 0;
-#ifdef CONFIG_KEXEC
+#ifdef CONFIG_KEXEC_CORE
char val[MAX_ADDR_LEN] = { };
int ret;
diff --git a/arch/x86/include/asm/syscall_wrapper.h b/arch/x86/include/asm/syscall_wrapper.h
index fd2669b1cb2d..21f9407be5d3 100644
--- a/arch/x86/include/asm/syscall_wrapper.h
+++ b/arch/x86/include/asm/syscall_wrapper.h
@@ -86,9 +86,6 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
return sys_ni_syscall(); \
}
-#define __SYS_NI(abi, name) \
- SYSCALL_ALIAS(__##abi##_##name, sys_ni_posix_timers);
-
#ifdef CONFIG_X86_64
#define __X64_SYS_STUB0(name) \
__SYS_STUB0(x64, sys_##name)
@@ -100,13 +97,10 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
#define __X64_COND_SYSCALL(name) \
__COND_SYSCALL(x64, sys_##name)
-#define __X64_SYS_NI(name) \
- __SYS_NI(x64, sys_##name)
#else /* CONFIG_X86_64 */
#define __X64_SYS_STUB0(name)
#define __X64_SYS_STUBx(x, name, ...)
#define __X64_COND_SYSCALL(name)
-#define __X64_SYS_NI(name)
#endif /* CONFIG_X86_64 */
#if defined(CONFIG_X86_32) || defined(CONFIG_IA32_EMULATION)
@@ -120,13 +114,10 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
#define __IA32_COND_SYSCALL(name) \
__COND_SYSCALL(ia32, sys_##name)
-#define __IA32_SYS_NI(name) \
- __SYS_NI(ia32, sys_##name)
#else /* CONFIG_X86_32 || CONFIG_IA32_EMULATION */
#define __IA32_SYS_STUB0(name)
#define __IA32_SYS_STUBx(x, name, ...)
#define __IA32_COND_SYSCALL(name)
-#define __IA32_SYS_NI(name)
#endif /* CONFIG_X86_32 || CONFIG_IA32_EMULATION */
#ifdef CONFIG_IA32_EMULATION
@@ -135,8 +126,7 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
* additional wrappers (aptly named __ia32_sys_xyzzy) which decode the
* ia32 regs in the proper order for shared or "common" syscalls. As some
* syscalls may not be implemented, we need to expand COND_SYSCALL in
- * kernel/sys_ni.c and SYS_NI in kernel/time/posix-stubs.c to cover this
- * case as well.
+ * kernel/sys_ni.c to cover this case as well.
*/
#define __IA32_COMPAT_SYS_STUB0(name) \
__SYS_STUB0(ia32, compat_sys_##name)
@@ -148,14 +138,10 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
#define __IA32_COMPAT_COND_SYSCALL(name) \
__COND_SYSCALL(ia32, compat_sys_##name)
-#define __IA32_COMPAT_SYS_NI(name) \
- __SYS_NI(ia32, compat_sys_##name)
-
#else /* CONFIG_IA32_EMULATION */
#define __IA32_COMPAT_SYS_STUB0(name)
#define __IA32_COMPAT_SYS_STUBx(x, name, ...)
#define __IA32_COMPAT_COND_SYSCALL(name)
-#define __IA32_COMPAT_SYS_NI(name)
#endif /* CONFIG_IA32_EMULATION */
@@ -175,13 +161,10 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
#define __X32_COMPAT_COND_SYSCALL(name) \
__COND_SYSCALL(x64, compat_sys_##name)
-#define __X32_COMPAT_SYS_NI(name) \
- __SYS_NI(x64, compat_sys_##name)
#else /* CONFIG_X86_X32_ABI */
#define __X32_COMPAT_SYS_STUB0(name)
#define __X32_COMPAT_SYS_STUBx(x, name, ...)
#define __X32_COMPAT_COND_SYSCALL(name)
-#define __X32_COMPAT_SYS_NI(name)
#endif /* CONFIG_X86_X32_ABI */
@@ -212,17 +195,12 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
/*
* As some compat syscalls may not be implemented, we need to expand
- * COND_SYSCALL_COMPAT in kernel/sys_ni.c and COMPAT_SYS_NI in
- * kernel/time/posix-stubs.c to cover this case as well.
+ * COND_SYSCALL_COMPAT in kernel/sys_ni.c to cover this case as well.
*/
#define COND_SYSCALL_COMPAT(name) \
__IA32_COMPAT_COND_SYSCALL(name) \
__X32_COMPAT_COND_SYSCALL(name)
-#define COMPAT_SYS_NI(name) \
- __IA32_COMPAT_SYS_NI(name) \
- __X32_COMPAT_SYS_NI(name)
-
#endif /* CONFIG_COMPAT */
#define __SYSCALL_DEFINEx(x, name, ...) \
@@ -243,8 +221,8 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
* As the generic SYSCALL_DEFINE0() macro does not decode any parameters for
* obvious reasons, and passing struct pt_regs *regs to it in %rdi does not
* hurt, we only need to re-define it here to keep the naming congruent to
- * SYSCALL_DEFINEx() -- which is essential for the COND_SYSCALL() and SYS_NI()
- * macros to work correctly.
+ * SYSCALL_DEFINEx() -- which is essential for the COND_SYSCALL() macro
+ * to work correctly.
*/
#define SYSCALL_DEFINE0(sname) \
SYSCALL_METADATA(_##sname, 0); \
@@ -257,10 +235,6 @@ extern long __ia32_sys_ni_syscall(const struct pt_regs *regs);
__X64_COND_SYSCALL(name) \
__IA32_COND_SYSCALL(name)
-#define SYS_NI(name) \
- __X64_SYS_NI(name) \
- __IA32_SYS_NI(name)
-
/*
* For VSYSCALLS, we need to declare these three syscalls with the new
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 4900c078045a..6ee925d66648 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -2972,6 +2972,25 @@ static void sev_es_vcpu_after_set_cpuid(struct vcpu_svm *svm)
set_msr_interception(vcpu, svm->msrpm, MSR_TSC_AUX, v_tsc_aux, v_tsc_aux);
}
+
+ /*
+ * For SEV-ES, accesses to MSR_IA32_XSS should not be intercepted if
+ * the host/guest supports its use.
+ *
+ * guest_can_use() checks a number of requirements on the host/guest to
+ * ensure that MSR_IA32_XSS is available, but it might report true even
+ * if X86_FEATURE_XSAVES isn't configured in the guest to ensure host
+ * MSR_IA32_XSS is always properly restored. For SEV-ES, it is better
+ * to further check that the guest CPUID actually supports
+ * X86_FEATURE_XSAVES so that accesses to MSR_IA32_XSS by misbehaved
+ * guests will still get intercepted and caught in the normal
+ * kvm_emulate_rdmsr()/kvm_emulated_wrmsr() paths.
+ */
+ if (guest_can_use(vcpu, X86_FEATURE_XSAVES) &&
+ guest_cpuid_has(vcpu, X86_FEATURE_XSAVES))
+ set_msr_interception(vcpu, svm->msrpm, MSR_IA32_XSS, 1, 1);
+ else
+ set_msr_interception(vcpu, svm->msrpm, MSR_IA32_XSS, 0, 0);
}
void sev_vcpu_after_set_cpuid(struct vcpu_svm *svm)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index f3bb30b40876..a8bd4e909a1e 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -103,6 +103,7 @@ static const struct svm_direct_access_msrs {
{ .index = MSR_IA32_LASTBRANCHTOIP, .always = false },
{ .index = MSR_IA32_LASTINTFROMIP, .always = false },
{ .index = MSR_IA32_LASTINTTOIP, .always = false },
+ { .index = MSR_IA32_XSS, .always = false },
{ .index = MSR_EFER, .always = false },
{ .index = MSR_IA32_CR_PAT, .always = false },
{ .index = MSR_AMD64_SEV_ES_GHCB, .always = true },
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index be67ab7fdd10..c409f934c377 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -30,7 +30,7 @@
#define IOPM_SIZE PAGE_SIZE * 3
#define MSRPM_SIZE PAGE_SIZE * 2
-#define MAX_DIRECT_ACCESS_MSRS 46
+#define MAX_DIRECT_ACCESS_MSRS 47
#define MSRPM_OFFSETS 32
extern u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;
extern bool npt_enabled;
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 9b1ec5d8c99c..a65fc2ae15b4 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -9,6 +9,7 @@ config XEN
select PARAVIRT_CLOCK
select X86_HV_CALLBACK_VECTOR
depends on X86_64 || (X86_32 && X86_PAE)
+ depends on X86_64 || (X86_GENERIC || MPENTIUM4 || MCORE2 || MATOM || MK8)
depends on X86_LOCAL_APIC && X86_TSC
help
This is the Linux Xen port. Enabling this will allow the
generated by cgit (git 2.34.1) at 2025-05-28 12:29:28 +0000