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Message-Id: <20170718223333.110371-7-thgarnie@google.com>
Date: Tue, 18 Jul 2017 15:33:17 -0700
From: Thomas Garnier <thgarnie@...gle.com>
To: Herbert Xu <herbert@...dor.apana.org.au>,
"David S . Miller" <davem@...emloft.net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H . Peter Anvin" <hpa@...or.com>,
Peter Zijlstra <peterz@...radead.org>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Thomas Garnier <thgarnie@...gle.com>,
Arnd Bergmann <arnd@...db.de>,
Matthias Kaehlcke <mka@...omium.org>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Juergen Gross <jgross@...e.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Radim Krčmář <rkrcmar@...hat.com>,
Joerg Roedel <joro@...tes.org>,
Andy Lutomirski <luto@...nel.org>,
Borislav Petkov <bp@...en8.de>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Brian Gerst <brgerst@...il.com>,
Borislav Petkov <bp@...e.de>,
Christian Borntraeger <borntraeger@...ibm.com>,
"Rafael J . Wysocki" <rjw@...ysocki.net>,
Len Brown <len.brown@...el.com>,
Pavel Machek <pavel@....cz>,
Tejun Heo <tj@...nel.org>,
Christoph Lameter <cl@...ux.com>,
Kees Cook <keescook@...omium.org>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Chris Metcalf <cmetcalf@...lanox.com>,
"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Christopher Li <sparse@...isli.org>,
Dou Liyang <douly.fnst@...fujitsu.com>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
Daniel Borkmann <daniel@...earbox.net>,
Markus Trippelsdorf <markus@...ppelsdorf.de>,
Peter Foley <pefoley2@...oley.com>,
Steven Rostedt <rostedt@...dmis.org>,
Tim Chen <tim.c.chen@...ux.intel.com>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Catalin Marinas <catalin.marinas@....com>,
Matthew Wilcox <mawilcox@...rosoft.com>,
Michal Hocko <mhocko@...e.com>,
Rob Landley <rob@...dley.net>,
Jiri Kosina <jkosina@...e.cz>,
"H . J . Lu" <hjl.tools@...il.com>,
Paul Bolle <pebolle@...cali.nl>,
Baoquan He <bhe@...hat.com>,
Daniel Micay <danielmicay@...il.com>
Cc: x86@...nel.org,
linux-crypto@...r.kernel.org,
linux-kernel@...r.kernel.org,
xen-devel@...ts.xenproject.org,
kvm@...r.kernel.org,
linux-pm@...r.kernel.org,
linux-arch@...r.kernel.org,
linux-sparse@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Subject: [RFC 06/22] kvm: Adapt assembly for PIE support
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible. The new __ASM_GET_PTR_PRE macro is used to
get the address of a symbol on both 32 and 64-bit with PIE support.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgarnie@...gle.com>
---
arch/x86/include/asm/kvm_host.h | 6 ++++--
arch/x86/kernel/kvm.c | 6 ++++--
arch/x86/kvm/svm.c | 4 ++--
3 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 87ac4fba6d8e..3041201a3aeb 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1352,9 +1352,11 @@ asmlinkage void kvm_spurious_fault(void);
".pushsection .fixup, \"ax\" \n" \
"667: \n\t" \
cleanup_insn "\n\t" \
- "cmpb $0, kvm_rebooting \n\t" \
+ "cmpb $0, kvm_rebooting" __ASM_SEL(,(%%rip)) " \n\t" \
"jne 668b \n\t" \
- __ASM_SIZE(push) " $666b \n\t" \
+ __ASM_SIZE(push) "%%" _ASM_AX " \n\t" \
+ __ASM_GET_PTR_PRE(666b) "%%" _ASM_AX "\n\t" \
+ "xchg %%" _ASM_AX ", (%%" _ASM_SP ") \n\t" \
"call kvm_spurious_fault \n\t" \
".popsection \n\t" \
_ASM_EXTABLE(666b, 667b)
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 71c17a5be983..53b8ad162589 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -618,8 +618,10 @@ asm(
".global __raw_callee_save___kvm_vcpu_is_preempted;"
".type __raw_callee_save___kvm_vcpu_is_preempted, @function;"
"__raw_callee_save___kvm_vcpu_is_preempted:"
-"movq __per_cpu_offset(,%rdi,8), %rax;"
-"cmpb $0, " __stringify(KVM_STEAL_TIME_preempted) "+steal_time(%rax);"
+"leaq __per_cpu_offset(%rip), %rax;"
+"movq (%rax,%rdi,8), %rax;"
+"addq " __stringify(KVM_STEAL_TIME_preempted) "+steal_time(%rip), %rax;"
+"cmpb $0, (%rax);"
"setne %al;"
"ret;"
".popsection");
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 4d8141e533c3..8b718c6d6729 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -554,12 +554,12 @@ static u32 svm_msrpm_offset(u32 msr)
static inline void clgi(void)
{
- asm volatile (__ex(SVM_CLGI));
+ asm volatile (__ex(SVM_CLGI) : :);
}
static inline void stgi(void)
{
- asm volatile (__ex(SVM_STGI));
+ asm volatile (__ex(SVM_STGI) : :);
}
static inline void invlpga(unsigned long addr, u32 asid)
--
2.13.2.932.g7449e964c-goog
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