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[PATCH] x86/MSR: use latched "current"
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 29 Nov 2022 15:49:55 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 29 Nov 2022 14:50:28 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
There's no need to recalculate / refetch the value from the stack
(pointer).
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/msr.c
+++ b/xen/arch/x86/msr.c
@@ -417,7 +417,7 @@ int guest_rdmsr(struct vcpu *v, uint32_t
* out of hardware.
*/
#ifdef CONFIG_HVM
- if ( v == current && is_hvm_domain(d) && v->arch.hvm.flag_dr_dirty )
+ if ( v == curr && is_hvm_domain(d) && v->arch.hvm.flag_dr_dirty )
rdmsrl(msr, *val);
else
#endif
@@ -639,7 +639,7 @@ int guest_wrmsr(struct vcpu *v, uint32_t
{
uint64_t xcr0 = get_xcr0();
- if ( v != current ||
+ if ( v != curr ||
handle_xsetbv(XCR_XFEATURE_ENABLED_MASK,
xcr0 | X86_XCR0_BNDREGS | X86_XCR0_BNDCSR) )
goto gp_fault;
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